There are a lot of people commenting that planes don’t fly by throwing air downwards but rather by the pressure differences created by the airfoils. But remember that the normal-pressure air well above the wing pushes down on the lower-pressure air immediately above it, effectively "squirting" air down and behind the wing in a backwash. In other words, the pressure difference that a wing creates and the downwash of air behind it aren't two separate things but all part and parcel of the same effect: an angled airfoil wing creates a pressure difference that makes a downwash, and this produces lift.
I have a little fun experiment for you. If you have cold water in lets say a cup, if you shake or stir it a little will it make the water colder or does it warm up because of friction? If you put some ice in the water it will get colder, but will the water get colder by itself?
The Action Lab Well people that say that are wrong anyway. If they were correct, it would be impossible to fly upside down. There is also angle of attack, that deflects the air downward to fly, as you correctly said
Colby Ness - I was just going to ask that too. then I thought of the vacuum cleaner did be the same as the drone. but at least with the drone we can see what's happening. also add color smoke bombs to see what the blades are actually doing.
I appreciate how you get straight to the point and show what we want to see instead of talking about it first for 20 minutes and only showing it right at the end.
If only they would show it in the end. You could just skip to the end. But they usualy show it in the most non-logical time, something like 14:56 - 15:32 out of 20 minutes video.
My guess is the scale won't change or even get heavier because the drone needs to push down as much air in force as it weighs to lift itself off the ground to begin with, and the scale will be weighing that since the air will push the box down more too
@@rubaiyatmehedi9337 if i remember correctly pressures just newton per square meter. So to lift 21 g the drone has to apply 21/1000 * 9.8 Force down against the force of gravity, if say the drone is 1 meter in surface area it has to put that amount of force on same 1 meter area of area which gets pushed downwards which causes the weight machine to count the same mass. If that makes sense?
People say his voice is boring and stuff like that, but to me, it's relaxing. I'm used to TH-camrs like JackSepticEye, Markiplier, and PewDiePie. They constantly yell, so these videos, this voice, is very soothing.
I'm not used to them, I deliberately don't watch them because of all the overdramatic yelling, so yeah, there are plenty of us who like his voice just the way it is for one reason or another. And I find that his lack of "TH-cam voice" intonation makes the content feel genuinely interesting rather than somewhat showey and mindless.
I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish. Could you point me to one or copypaste one here?
I have no idea what dunning kruger is, but I'm assuming I'm probably one of the people your referring to because of the fact that I have no idea what the dunning kruger effect is
Ohh wait wait Today I saw a video of a popular Indian uthuber (TH-camr) with 12M subs. And he said that Newton's third law works.. and showed that flying drone will weight more than resting drone.. And I was like.. wtf dude.. And now I'm here 😁 So I wanted to know the ans 😉
Totally thought it was obvious in a closed environment but never occurred to me that it would be the same in the open test. It's simple but never thought about it, thanks for showing the video.
i was sad he didnt explain how the air is 'thrown' his description made it sound like they push air down when in reality they create areas of low pressure which creates lift
I successfully predicted the enclosed (w/ lid) system would stay at 0g but for sure thought the lid-less container would show closer to -21g because the air would "escape". I was completely baffled when just the glass floor basically captured all 21g of 'downforce' from the small drone. Very interesting!
The pressure of the plain would be distributed over a larger area than your body so you would not feel its full weight, but you would definitely feel some pressure.
Well actually the draft downwards is the product of the so called induced resistance, which results out of a pressure exchange on the ends of the wings (since theres an underpressure on the upper side of the wing and an overpressure on the downside). It results in a whirlwind like thing on the end of the wings and is not actually the thing which presses the plane up. This induced resistance is actually a bad thing since its well... resistance - which causes the wings to create less upward trend. To come back to your original question: The whirlwind thing stays for a while in the path the ends travelled through. The strength and duration depends on the difference of the overpressure and underpressure and the speed/power of the plane Big planes create a really strong and giant whirlwind which is actually dangerous, especially for smaller hobby planes (but also for the passenger machines), which is why theres a few minutes delay between 2 starts on the same runway on traffic airports
Your short brought me here! Great video! As soonest I saw that case without the lid and without the walls but only the base in about 4:00, I quickly understood the concept! So the wind pushing down equates the weight of the drone. Wow, still mindblowing the fact that it equates the weight and not something in between or higher!
@@fennviktorvich I'm pretty sure the first instinct in these kinds of experiments is to fly it up, hovering in the middle of the box. But he just bumped it all throughout. I call bad flying skills.
It is not a professional drone with altitude control, its just a toy try to fly a toy helicopter and a professional RC helicopter you will find the difference!
I have a theory before watching the video.. whatever the drone weighs, like 50 grams is the weight difference. So whatever air pressure needs to be produced by the fans to lift 50g, will therefore be pushing downwards 50g.. therefore no matter the box, as long as the drone is above the scale, it's exact weight will always be pushing down on it, whether it is the physical weight of the drone itself, or the weight of the air pressure created by the need to lift the drone. *Edit* Note to self.. never get a job as a 'guess your weight' machine..
If a plane ACCELERATES upwards or downwards inside a closed box, there will be an acceleration of the center of mass of that whole system. An accelerating center of mass means a force will result. In more concrete terms, the slight sloshing of air from the top of the box to the bottom of the box is what produces the acceleration along with the reaction force. If you get a scale sensitive enough, you'll see the perturbations. However, you can't maintain a force bias over time because no reaction mass escapes the system. Perturbations up and down are possible temporarily but they must average to zero over long periods.
@@V_Deity Well, if i am not wrong then this is about projectile motion where the horizontal component of the impact net velocity would be the same as the plane and the vertical component will depend on the height of the plane when the person jumps off.
It is. This is a fact. Every body needs to make money though. The whole point of these is ENTERTAINMENT. and knowledge second. You want to learn, you go through the entire subject. And is it necessary to call me stupid? I dont understand why this is the way we are wired, but because we have a barrier between us, you decide to be an ass hole, while others may act tough. Its ridiculous. I cant stand people judging people, its a bunch of bullshit. Anyways, Im sure your smart. And Im sure you a decent enough person in reality. But I dont get why you, amoungst many, feel the need to be superior.
This reminds me of a Star Trek The Next Generation episode with a joke about flying a freighter with canaries and half your fuel. The joke says you'll be fine if you keep half the canaries flying the whole time. Then Data chimes in to refute the claim.
You have a very interesting and addictive channel. Ive always been curious about strange things like this but never had the knowledge to run tests. Great shit !!
I made a mental forecast. I did not expect any weight change in the enclosed box. I didn't expect any change in the open topped box, but I wouldn't have been surprised by a gram or so. I was surprised by the lack of change with the glass plate. With nothing to contain the moving air, I expected there to be at least a small change. So, interesting finding. Regards the wings of a plane, our schools are only teaching partial truths. I remember hearing that "planes get lift from the vacuum above the wings" teaching back in the '70's, so that understanding has been around a very long time. It isn't until an interested student starts delving into aeronautics that he leans about lift occurring both above and below the wings, and how drag can be directed somewhat to improve wing performance, and how thrust affects the parameters of that performance. Aeronautics is a degree program for a reason, but teachers really should tell students during the wing performance lessons that they are only touching the tip of the iceberg.
It would float,because density of real vaccum is zero. Atleast i assume that. Because "nothing" has no mass,since having specific density which is equal to 0. 0kg/m^2 is smaller than 1000kg/m^2. Altrough it would entirely depend on definition of bottle.
I recall arguing about this physics thought experiment back around 2006 or so with people on my 4x4 forum. One way to start thinking about it is to just remember in the case of the closed box, the Law of Conservation of Mass applies. No mass is being exchanged so the weight can’t change either. As you remove more sides it gets more complex and you need to understand the fluid dynamics a bit more. One thing I explained is that unless the box is pretty large relative to the helo, the air in the box will get very turbulent very fast, making it tough to hover - as we saw here. Mythbusters tested a related myth around that time too and came to the same conclusions. But people have a hard time wrapping their heads around the fact that the weight of a jet airliner flying at, say, 500 feet, is borne by everything below it, including us. It just gets dissipated in the air column quickly
To do the experiment correctly, get a box which is much taller. So tall that there is nearly full mixing of the air and very litte direct breeze normal to the floor of the container. In other words, high enough so there is little or no 'ground effect'. I suspect that the results will be different. But then I also expected much less of a reading on the relatively small closed container and the more open experiments, so maybe I'm wrong about my intuition and understandings of fluid dynamics.
Tom Huppi yup that's my expectation aswell. That *weight* is created by the air hitting the ground, with a higher box that ground pressure would vanish.
Einheit-101 I would imagine the velocity of the "exhaust" air would drop very quickly as the drone gains some height. I figured there would be a slight weigh loss because if this at his experiment heights. Who knew?
The turbulent mixing would decrease the downwash speed (you're right about this) but would spread over a bigger area. The original lift force is still same, and this cannot disappear. It must still counteract all the (spread out) downwash. The lower pressure over bigger area would collect back down to the same single-point (force) scale reading. The closed box is a literal example of a "closed system" and its weight (with fluctuations averaged over time) cannot change.
Perfect experiment and perfect explanation. I aways love following your videos. Request: would you please make an experiment of an electric bell ringing in your vacuumed chamber? I hope you continue uploading more videos regularly, you are teaching us much. Great job, scientist.
What's with the dislikes? Why so many! LoL I did not see anything bad at all about the video! I love your laugh! btw! Your vids are very entertaining! One reason is because you are always in a good mood and a happy guy.. LOL
@@ExaShark First law is about the tendency of object to keep its state (moving one will tend to move, motionless one will still motionless, etc) while the Third law is about well... action and reaction, which would explain why the drone still have "weight" regardless it was in the air or not. I take the bait anyways. So be happy.
Hey! I have a question. If the drone has to fly to a certain height , it should exert a force which should overcome the downward force so that the upward force is more than downward force. Then the net force acting on the drone will be more in upward direction and this will result in flying the drone. When it hovers then upward and downward force will be equal. Now, my question is The weight of the scale should increase initially then it should become equal right. But it is showing the same scale all the times. How?
My hypothesis would be that with the Open Lid container, it would weigh less once the drone takes off, but still weight fractionally more than if it were just the container, due to the air pressure vacuuming the air above and pushing it downwards, although I would think it also depends on how high up the drone hovers in the box, as the closer to the top it gets, the more distance between the base of the container and the air that's being pushed down. As for the Glass plate, I would suspect that the weight of the drone would entirely disappear once it takes off far enough above the base, although the difference in air pressure, much like the open container would push down causing it to be close to no difference depending on how far up it hovers, although as it's not contained even partially the air that's being pushed downwards can spread uniformly across the plate and escape off the edge. The Closed Lid container, I would think would stay the same, as it's all contained within, even the air that is being used to propel the drone, is in a closed loop with no way of escaping the system, effectively making no change in gravitational potential energy.
Essentially, to hover, the drone has to create a force pushing downwards equal to its weight as not to accelerate in the direction of gravity, so whenever the drone hovers, it's pushing down equal to its weight, and depending on the distance between the plate and drone. The air will either be pushed down equal to the weight of the drone and hit the plate, causing it to detect a weight, or it will be too big of a distance and the air that's being pushed down will disperse and drop off.
It's called ground effect. How far do you need to go above the scale to negate the pressure effects that your seeing. Aircraft don't throw there total weight "down" to achieve flight, a good portion of the lift is achieved from the pressure difference created by the curve of the wings upper surface as air flows over it. In close proximity to the ground the pressure under the wing increases due to compression of the air passing between the wing and the surface it's passing over. This in effect is what the scale is measuring. Ever felt your car rock back and forth when a large truck passes by when your stopped at a traffic light. Your vehicle is effected by the pressure wave produced by the passing vehicle. Even stationary objects effect moving vehicles if they are close enough to the vehicle as it passes, say phone poles, signage, or barriers, these produce the same effect and will slow the vehicle down, but that's another topic.
I think that in an atmosphere this would only really be possible if the mass of the drone were greater than or equal to the mass of the scale. As well as if the drone had minimal surface area/protrusions (like no propellers... or arms). That's all because the force applied by the air would lift the drone up relative to the scale if the area was too great and/or it weighed less than that force. Ideally, a drone capable of taking off in this situation would accelerate the scale downward, thus making the reading spike up from zero for an instant. That force would read approximately equal to whatever force air is pushing upwards on the drone with; but In turn the drone would make its own acceleration less negative ( more negative = greater downward acceleration). This is an ideal controlled situation and really it would be better to use a brick. Even better would be to just give up because who cares in the end?
When the drone is in freefall, the scale would (once the air pressure changes reached the bottom) show the weight of the drone vanishing. But that's fine, because forces only have to balance in a static equilibrium situation, which free fall is not.
I thought the scale would measure more weight as the drone gains altitude, less weight when it loses altitude and stays at 0 when it hovers in place. I'm not sure if I was wrong. I think we need a more sensitive scale xD
I too think that the acceleration and accompanying thrust would be factorial in the weight shown by the scale. Maybe not the altitude as such, but the rate of change in altitude.
@@williamhawes7005 hmm as long as you are not higher than the walls I think the height might not matter too much. Since the air that the drone pushes downwards spreads out like cones and walls would focus all the thrust down to the bottom of the box.
I guess the first one will be heavier when accelerating up. But stopping in the middle would come back to the same weight. While opening the lid, it should be a little lighter, but normally it would be the same condition to the one with the lid. The one with the flat one, it should get the less weight, because the air will blow out, and the force will not transmit to the bottom. Guess
No, it is a closed system the only way to affect the inertia of the system is an "external" force. So inside forces don't matter because as the drone produces a force downward it also creates an equal and opposite force upward hence canceling them.
It doesn't mean the drone can't fly( please don't think my first reply as a wrong explanation of newton's third law, it only need an external force and that's the important thing).
Maybe, but the force would have to be very concentrated. With an aircraft or helicopter, they likely distribute the force over a large area so it likely wouldn’t hurt you.
One thing this guy cheated is he didn't fly high... If he does that the whole air would not be sent to the ground at the same velocity of exit from the prop due to the turbulence of air. So without this concept, the science when a heli flies above ur head tells u that u r having the weight of the heli on ur head (if at all not full but a fraction which is equal to ur head's area over the prop full coverage ie a circle.)xD
Same... Except I'm no better... I've had 3 remote control helicopters (just the cheap little things that can't go very far away) and one, big, expensive drone that looks just like his little drone but 15 times bigger and... I kinda destroyed two out of the three cheap helicopters I had (the first one stopped running the bottom two blades cause I'd let it hit things and kept trying to fly it instead of picking it up so the gears and shit wore down and now it flies in circles and the second one I had broke basically the same way, except since I was to afraid to let the blades hit literally ANYTHING as it was running, I'd instantly turn it off when it got anywhere NEAR touching something no matter how high it was so it just kept falling from highs of 5 to 10 to even sometimes 15 or more feet up when it hit or got close to hitting things and I'd just let it fall and crash which eventually broke it as well... It didn't brake so abruptly but it just ran slower and slower like they do when they need to be charged but... One day I had it fully charged and wanted to fly it but... It just slowly fell down to the ground instead) so... Now I'm kinda just to afraid to even TRY flying the two I have left (my last cheap helicopter and my huge freaking drone) because I don't want to break them... Even though it's been like 4 years since I broke the last one... And since then, drones and other remote controlled objects have become a LOT less popular so they probably don't even cost that much to replace and at this point, I could probably get even BETTER ones for cheaper... But... I still don't even dare touch the remotes... :T
I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish. Could you point me to one or copypaste one here?
I don’t think you would get the same effect with the airplane because you are dealing with a sail effect more than direct thrust. In other words lift, not thrust. Wings and sails create a vacuum that pulls on the convex side. So measuring the force would not be quite the same. Or did I misunderstand what you were saying ?🤔🙂
It works exactly the same way - planes are still exerting a downwards force on the air. All airfoils work the same way - whether they be a wing, a propeller or a rotor. The only difference between aircraft is how they harness those effects
In Germany we have a bridge for ship traffic only. If I were to image each if the supporting colums were on a scale would the scale show more weight when a ship passes over the bridge?
Okay, I haven't read any comments nor have I watched the video till it's conclusion. With that said, I was actually shocked on the results of this test and actually had to think what was happening. I think I have it figured out. After I'm done typing this I will finish the video. But if I were to guess, the drone has to generate enough lift to overcome it's mass or weight which gravity is exerting on it. So the props in the the drone's motors have to offset the pull of gravity to a minimum of the drone's weight to achieve lift. That needed force would equate to the drone's weight in down-force; which would be pushing down onto the scale. Hence the reason the scale doesn't register a change in the amount for force/weight being applied to it. Until the drone physically moves to a position where it is no longer applying down-force against the scale, which leads to the scale registering the lack of down-force/weight to the scale. Now to see if I got it right... BTW- Science has always been my favorite course of study.
One small mistake. The quad is not sending 12g of air downward. Its exercing 12g of force on air, but this mostly includes accélération of air, rather than raw mass.
36 seconds into the video, and my predictions are as follows: I assume the scale is zeroed to ignore the "tare" of the containers. The indicated weight will likely decrease very slightly as the drone leaves the surfaces in all the different scenarios but the weight of the drone will still influence the indicated weight... to a point...As the drone climbs, it's "ground effect" will decrease, eventually reaching zero and a corresponding zero indication on the scale will result. I don't know what the ground effect distance is, as it will be different for different types and sizes of aircraft. I have shown this by launching a tiny gyro helicopter from a tabletop, moved it horizontally past the edge, and it immediately would drop to it's ground effect height from the floor OK, back to the video to see if I was correct. >The indicated weight did not even decrease slightly in all three scenarios, likely because the drone never ascended out of it's ground effect altitude. So, I was kinda wrong Try flying it higher and you will see what I mean by "ground effect". I know about ground effect because I'm a light aircraft pilot, and ground effect always wants to keep a plane flying when you want it to land, but tend to "float" at about 15 feet altitude, so you have to "stall" the wings to get it to touch down.
The comments section helped. This experiment was close to the ground and made sense. But you don't feel airplanes or helicopters flying above you...right? Wondered about the answer to that...so how high before the ground doesn't "feel" the "weight" of the flying machine?
Q: A vacuum box with a perfectly reflective inside surface is heavier with photons in it or weights the same when it's totally empty? A: the setup is heavier with photons. Why: The mass is basically the matters resistance against acceleration trough energy acceptance or dissipation. Accelerating the box will put energy into the photons when they hit the walls so the photons will act as they have mass. E=mc²
The closed container stays at 0 because for the drone to take off it needs to exert 21grams of thrust before it can take off, which is pushing the scale down. When the drown starts to fly up, the box doesn't way more because the amount of thrust extra output is negligible. When he hits the top of the box, he is pushing down at X grams of force, and pushing up on the container at X-21grams of force, therefore the scale will NEVER be anything but zero. Unless you put your hand in under the drone, then the air wouldn't be pushing on the box as much, more on your hand
This experiment was very clearly described and was highly interesting! On my channel you can see the only heavier than air ion thrusters that are verified to lift their onboard power supplies directly against Earth's gravity.
Not disrespectful but it makes sense that props push the same mass/weight of air down as the drone is heavy. For an easier way to understand this is if you imagine next: a body falls at straight down. It reaches its maximum speed due to air resistance (lets say that speed is 120ft/s). Now the job of props is that they need to push down the amount of air downwards to eaqualize the weight of the drone. Now lets say that the drone weighs 500g. That means that props must push down 700 liters of air per minute. It might be easier to say that the air pushed down moves at the maximum speed of the body (120ft/s). That counts for hovering. If you want to go up, you increase the speed of props witch push down more air/push it down faster at; lets say 150ft/s. And if you want to go down, then you drop the RPM of the props, down below 120ft/s; maybe 100ft/s. And because the air pushed down from the props at this low altitude it presses on the glass with the same/a bit lower pressure but it doesn’t make it weightless. Thats couse the mass of air is just rolling around in the box it doesn’t have any air to stop the flow underneath, the only object that does is thet glass
Gravity is not alone. Pressure is another contributing factor to matter sticking together. What is air made of? Gases composed of elements and atoms. In the laws of thermodynamics, all gases can condense into liquids, all liquids can freeze into solids, all solids can melt into liquids, and all liquids can boil into gases at the right temperatures. Meanwhile, they all are constantly putting pressure on each other.
The difference to your videos and those of the others, like veritasium, is that you immediately know the answer at the beginning of your video and there is no surprise or aha moment
What would happen if you stood directly underneath a hovering helicopter feet away from you? Would you feel all the weight of the helicopter? What if you stood in a room larger than the helicopter but without a roof, with the helicopter hovering right above it?
I've deliberately not run this video yet, but carried out a thought experiment. I think the weight will remain the same. The weight of the air will not change- no change in volume. But there has to be a downward force to overcome gravity acting on the drone. This will be equivalent to its weight and will act on the floor of the box. Don't know about no box or open box. Now I'll view the video.
As long as the drone is over the scale or the surface attached to it, the weight won't change because the amount of air displaced downwards has to match the weight of the drone or it wouldn't be buoyant. That's why if you fly it off the surface, the scale jumps to the weight of the drone.
i wonder if we put a plant there with all that is necesary for growing , how much of its wheight is the light energy transformed to matter. im very curios what percent it will be. sorry for my english.
There are a lot of people commenting that planes don’t fly by throwing air downwards but rather by the pressure differences created by the airfoils. But remember that the normal-pressure air well above the wing pushes down on the lower-pressure air immediately above it, effectively "squirting" air down and behind the wing in a backwash. In other words, the pressure difference that a wing creates and the downwash of air behind it aren't two separate things but all part and parcel of the same effect: an angled airfoil wing creates a pressure difference that makes a downwash, and this produces lift.
I have a little fun experiment for you. If you have cold water in lets say a cup, if you shake or stir it a little will it make the water colder or does it warm up because of friction? If you put some ice in the water it will get colder, but will the water get colder by itself?
+Pirat Carribean good idea! I might just do that!
Can a drone fly in a vacuum chamber?
The Action Lab Well people that say that are wrong anyway. If they were correct, it would be impossible to fly upside down. There is also angle of attack, that deflects the air downward to fly, as you correctly said
Colby Ness - I was just going to ask that too. then I thought of the vacuum cleaner did be the same as the drone. but at least with the drone we can see what's happening. also add color smoke bombs to see what the blades are actually doing.
I appreciate how you get straight to the point and show what we want to see instead of talking about it first for 20 minutes and only showing it right at the end.
If only they would show it in the end. You could just skip to the end. But they usualy show it in the most non-logical time, something like 14:56 - 15:32 out of 20 minutes video.
The title should include the answer to the question if it is straight to the point.
@@maximumhero9682 then nobody would click on it
This guy is trying to showcase all those highschool tricky physics questions, that haunted me for years, in real life! Mad respect!
Now ,as we see it it's , easy pesy
Now that's smart! Im only paying attention to that tiny drone. It'd be great if DJI can make a drone that tiny
Tello?
Its a tinywhoop
My guess is the scale won't change or even get heavier because the drone needs to push down as much air in force as it weighs to lift itself off the ground to begin with, and the scale will be weighing that since the air will push the box down more too
Yep I was going to write the same thing but here you are
:(
Yes, but there must be some dependence on altitude eventually.
I _wrote_ the same thing
I thought the same
Every action has an equal opposite reaction, so for the drone to lift it's 21 grams it need to push air down with an equal 21 grams of pressure
thanks captain obvious :|
Pressure or Force.
Btw the unit of pressure is Pascal not gram
@@rubaiyatmehedi9337 if i remember correctly pressures just newton per square meter. So to lift 21 g the drone has to apply 21/1000 * 9.8 Force down against the force of gravity, if say the drone is 1 meter in surface area it has to put that amount of force on same 1 meter area of area which gets pushed downwards which causes the weight machine to count the same mass. If that makes sense?
@@cpt.battlecock5264 yes Newton's per meter squared is the same as pascals. And yeah you're totally right.👍
@@rubaiyatmehedi9337 Fuck yes. Im finally getting an intuition for classical mechanics.
Bugs when they see a window: 1:31
Usually i opened it for them
@@madharambe3264 good man
Or moths when they see a lamp indoors
Whats the last thing a bug sees when it hits a car windshield going 60mph ?
Its buttonhole . 😂 😂
The hovering ability of the first drone is amazing. Sure wish my Mavic was that stable
it is happening because of air turbulence
Did you calibrate it?
is nobody able to take satire jokes?
its not satirical at all..
I read this before actually seeing it take off and when it did I couldn't breathe I was laughing so hard
Cool. I feel like trying it with the DJI Mini 2
Nice experiment on the Mavic drone too!
People say his voice is boring and stuff like that, but to me, it's relaxing. I'm used to TH-camrs like JackSepticEye, Markiplier, and PewDiePie. They constantly yell, so these videos, this voice, is very soothing.
I'm not used to them, I deliberately don't watch them because of all the overdramatic yelling, so yeah, there are plenty of us who like his voice just the way it is for one reason or another. And I find that his lack of "TH-cam voice" intonation makes the content feel genuinely interesting rather than somewhat showey and mindless.
the dunning kruger effect in the comments is what I find so fascinating about these videos
Exactly. Somehow this channel has way more dumb people on it than other science channels...
I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish.
Could you point me to one or copypaste one here?
I have no idea what dunning kruger is, but I'm assuming I'm probably one of the people your referring to because of the fact that I have no idea what the dunning kruger effect is
@@ChrisLuigiTails Including you.
@@yoshi6445 simply put it's a relattion between confidence and knowledge. How 'dumber' people overestimate their abilities.
This channel answers questions I never knew I wanted an answer for
Ohh wait wait
Today I saw a video of a popular Indian uthuber (TH-camr) with 12M subs.
And he said that Newton's third law works.. and showed that flying drone will weight more than resting drone..
And I was like.. wtf dude..
And now I'm here 😁
So I wanted to know the ans 😉
@@manishkumarshakya7989 you mean crazy xyz lol..
@@b-beluga4510 yepp 😂
Totally thought it was obvious in a closed environment but never occurred to me that it would be the same in the open test. It's simple but never thought about it, thanks for showing the video.
You said the container is Tupperware when clearly it is Rubbermaid
Daniel Warnock it's literally the same thing. It's plastic tubs.
I know, that's so unforgivable, this experiment is clearly a lie!
Clearly Tupperware is being generalized.
Details matter people.
It's like buying a Land Rover, then going around calling it a Jeep
7:45 "So you can picture flying objects as just big air throwers..."
*The Montgolfier brothers started typing furiously*
As an aviation enthusiast, its quite good (and rare) to see someone use correct terms 👍
i was sad he didnt explain how the air is 'thrown' his description made it sound like they push air down when in reality they create areas of low pressure which creates lift
@@danmccabe9889 yes
I successfully predicted the enclosed (w/ lid) system would stay at 0g but for sure thought the lid-less container would show closer to -21g because the air would "escape". I was completely baffled when just the glass floor basically captured all 21g of 'downforce' from the small drone. Very interesting!
2:07 clearly the scale doesn't work, no push and no weight on the scale, yet it scores zero! hahahhahahaha!
This literally blew my mind. The forces those tiny plastic props create is mind boggling.
Would someone laying on a runway get squished by the air of a landing aircraft?
if its powerful enough the engine on the fastest plane the blackbird sr will probably be like a pressure wash
The pressure of the plain would be distributed over a larger area than your body so you would not feel its full weight, but you would definitely feel some pressure.
Well actually the draft downwards is the product of the so called induced resistance, which results out of a pressure exchange on the ends of the wings (since theres an underpressure on the upper side of the wing and an overpressure on the downside). It results in a whirlwind like thing on the end of the wings and is not actually the thing which presses the plane up. This induced resistance is actually a bad thing since its well... resistance - which causes the wings to create less upward trend.
To come back to your original question:
The whirlwind thing stays for a while in the path the ends travelled through. The strength and duration depends on the difference of the overpressure and underpressure and the speed/power of the plane
Big planes create a really strong and giant whirlwind which is actually dangerous, especially for smaller hobby planes (but also for the passenger machines), which is why theres a few minutes delay between 2 starts on the same runway on traffic airports
LMAO
@@Add50326 Additionally the highest pressure is only at the underside of the wing, it falls away with distance.
Your short brought me here! Great video! As soonest I saw that case without the lid and without the walls but only the base in about 4:00, I quickly understood the concept! So the wind pushing down equates the weight of the drone. Wow, still mindblowing the fact that it equates the weight and not something in between or higher!
You really can't fly drones can you?
*TWIDDLES CONTROLLER FURIOUSLY*
T-Rex FPV he’s so bad
David Ouch, that tiny thing probably only has headless leveled mode.
Tbh acro flight is fucking impossible, but darn fun.
imposible to fly in stab mode! it tends to always correct self. in acro it keeps constantly angle what you want!
1:23
What?
Who?
when?
Where?
Why?
Is no one gonna talk about how bad his flying skills are 😂
No, because he intentionally bumped into the box to see if it will change the scale reading or not
@@fennviktorvich I'm pretty sure the first instinct in these kinds of experiments is to fly it up, hovering in the middle of the box. But he just bumped it all throughout. I call bad flying skills.
@@fennviktorvich 3:29 with sides all removed, see how he struggled to keep it still..
I actually used to have the SAME EXACT drone (the small red one he first used)And let me tell you. IT IS HARD TO CONTROL.
It is not a professional drone with altitude control, its just a toy try to fly a toy helicopter and a professional RC helicopter you will find the difference!
brilliant way of demonstrating how drones stay still...!
With my advertisement at the end I ingrained the word "brilliant" in your head:)
believe me, i wrote the comment before the ad section!
i dont believe you
I love that this channel answers all of my shower thoughts
Think abOut this: if a coconut has milk and hair, is it a mammal?
I'm in the shower
If this channel answered all of my shower thoughts it would be porn.
I have a theory before watching the video.. whatever the drone weighs, like 50 grams is the weight difference. So whatever air pressure needs to be produced by the fans to lift 50g, will therefore be pushing downwards 50g.. therefore no matter the box, as long as the drone is above the scale, it's exact weight will always be pushing down on it, whether it is the physical weight of the drone itself, or the weight of the air pressure created by the need to lift the drone.
*Edit* Note to self.. never get a job as a 'guess your weight' machine..
The Last Knight i agree
Gee MBDT, you sure is a smart fella!
when you're supposed to be doing science homework only to realize you're watching science videos on youtube anyway
School paradox 😔
RIGHT AT ZERO
If a plane ACCELERATES upwards or downwards inside a closed box, there will be an acceleration of the center of mass of that whole system. An accelerating center of mass means a force will result. In more concrete terms, the slight sloshing of air from the top of the box to the bottom of the box is what produces the acceleration along with the reaction force. If you get a scale sensitive enough, you'll see the perturbations. However, you can't maintain a force bias over time because no reaction mass escapes the system. Perturbations up and down are possible temporarily but they must average to zero over long periods.
I wish you was my physics teacher when I was at the school 😍
Abdal, if a commercial flight impacts a skyscraper at 550mph, how fast will the infidels on the top floor hit the pavement when they jump?
@@V_Deity Well, if i am not wrong then this is about projectile motion where the horizontal component of the impact net velocity would be the same as the plane and the vertical component will depend on the height of the plane when the person jumps off.
Of course you had to make the video 9 minutes long
David Herrera 3, 2, 1...
He could easily show the thirty second experiment I get you
Thats not as fun though. Just cuase something longer than it needs to be, isnt bad. Its called entertainment.
It is. This is a fact. Every body needs to make money though. The whole point of these is ENTERTAINMENT. and knowledge second. You want to learn, you go through the entire subject. And is it necessary to call me stupid? I dont understand why this is the way we are wired, but because we have a barrier between us, you decide to be an ass hole, while others may act tough. Its ridiculous. I cant stand people judging people, its a bunch of bullshit. Anyways, Im sure your smart. And Im sure you a decent enough person in reality. But I dont get why you, amoungst many, feel the need to be superior.
Justin 355 I was having a bad day. I'm sorry, now that I read this, I feel bad.
This is really one of the best channels on the net. I want to see a TH-cam Science Team Up! The Action Lab, Smarter Everyday, Vertasium would be epic!
This reminds me of a Star Trek The Next Generation episode with a joke about flying a freighter with canaries and half your fuel. The joke says you'll be fine if you keep half the canaries flying the whole time. Then Data chimes in to refute the claim.
You have a very interesting and addictive channel. Ive always been curious about strange things like this but never had the knowledge to run tests. Great shit !!
I made a mental forecast. I did not expect any weight change in the enclosed box. I didn't expect any change in the open topped box, but I wouldn't have been surprised by a gram or so. I was surprised by the lack of change with the glass plate. With nothing to contain the moving air, I expected there to be at least a small change. So, interesting finding.
Regards the wings of a plane, our schools are only teaching partial truths. I remember hearing that "planes get lift from the vacuum above the wings" teaching back in the '70's, so that understanding has been around a very long time. It isn't until an interested student starts delving into aeronautics that he leans about lift occurring both above and below the wings, and how drag can be directed somewhat to improve wing performance, and how thrust affects the parameters of that performance. Aeronautics is a degree program for a reason, but teachers really should tell students during the wing performance lessons that they are only touching the tip of the iceberg.
Will a bottle with vacuum in it float in water?
a bottle without vacuum will float on water anyways lol
I think it would depend exclusively on the bottle's density, since the air "in it" wouldn't be playing any job in the overall density's system o
CroGamerPro good question
It would float,because density of real vaccum is zero.
Atleast i assume that.
Because "nothing" has no mass,since having specific density which is equal to 0.
0kg/m^2 is smaller than 1000kg/m^2.
Altrough it would entirely depend on definition of bottle.
A bottle with air in it will weigh less then the water, a bottle with no air in it it will weigh even less so of course it will float.
1:27 I just saved 1 minute of ur life. You could do something important with that
Meh I could slap a frog in that amount of time.
Thank you. You are a good man
I recall arguing about this physics thought experiment back around 2006 or so with people on my 4x4 forum. One way to start thinking about it is to just remember in the case of the closed box, the Law of Conservation of Mass applies. No mass is being exchanged so the weight can’t change either. As you remove more sides it gets more complex and you need to understand the fluid dynamics a bit more. One thing I explained is that unless the box is pretty large relative to the helo, the air in the box will get very turbulent very fast, making it tough to hover - as we saw here.
Mythbusters tested a related myth around that time too and came to the same conclusions. But people have a hard time wrapping their heads around the fact that the weight of a jet airliner flying at, say, 500 feet, is borne by everything below it, including us. It just gets dissipated in the air column quickly
To do the experiment correctly, get a box which is much taller. So tall that there is nearly full mixing of the air and very litte direct breeze normal to the floor of the container. In other words, high enough so there is little or no 'ground effect'. I suspect that the results will be different. But then I also expected much less of a reading on the relatively small closed container and the more open experiments, so maybe I'm wrong about my intuition and understandings of fluid dynamics.
Tom Huppi yup that's my expectation aswell. That *weight* is created by the air hitting the ground, with a higher box that ground pressure would vanish.
Einheit-101 I would imagine the velocity of the "exhaust" air would drop very quickly as the drone gains some height.
I figured there would be a slight weigh loss because if this at his experiment heights. Who knew?
The turbulent mixing would decrease the downwash speed (you're right about this) but would spread over a bigger area. The original lift force is still same, and this cannot disappear. It must still counteract all the (spread out) downwash. The lower pressure over bigger area would collect back down to the same single-point (force) scale reading. The closed box is a literal example of a "closed system" and its weight (with fluctuations averaged over time) cannot change.
+The Action Lab We need bigger boxes and more accurate scales!
Perfect experiment and perfect explanation.
I aways love following your videos.
Request: would you please make an experiment of an electric bell ringing in your vacuumed chamber?
I hope you continue uploading more videos regularly, you are teaching us much. Great job, scientist.
This is such a good experiment to show how things fly! Nice one
That’s not how I planes work though
@@FlorenceSlugcat Well all things that fly have to displace air. So related.
You Deserve a Million subs for your knowledge !
What's with the dislikes? Why so many! LoL I did not see anything bad at all about the video!
I love your laugh! btw! Your vids are very entertaining! One reason is because you are always in a good mood and a happy guy.. LOL
look closer then
That's just Newton's 3rd law in action
The Turtle no, that’s 1st law
@@ExaShark First law is about the tendency of object to keep its state (moving one will tend to move, motionless one will still motionless, etc) while the Third law is about well... action and reaction, which would explain why the drone still have "weight" regardless it was in the air or not.
I take the bait anyways. So be happy.
@@GregorianMG It's possible he means Newton's first law of thermodynamics in which he is technically correct but not really.
@@XerosOfficial i doubt he means that lol
just don't specify the number and you can't be wrong 😂
How do you come up with all these different ideas for your videos?
Hey! I have a question.
If the drone has to fly to a certain height , it should exert a force which should overcome the downward force so that the upward force is more than downward force.
Then the net force acting on the drone will be more in upward direction and this will result in flying the drone.
When it hovers then upward and downward force will be equal.
Now, my question is
The weight of the scale should increase initially then it should become equal right. But it is showing the same scale all the times. How?
Probably not sensitive enough scale.
I really hope this experiment will be used in physics class to explain forces.
These videos must have a conclusion part in the end cz they are so long that not everyone could watch !
My hypothesis would be that with the Open Lid container, it would weigh less once the drone takes off, but still weight fractionally more than if it were just the container, due to the air pressure vacuuming the air above and pushing it downwards, although I would think it also depends on how high up the drone hovers in the box, as the closer to the top it gets, the more distance between the base of the container and the air that's being pushed down. As for the Glass plate, I would suspect that the weight of the drone would entirely disappear once it takes off far enough above the base, although the difference in air pressure, much like the open container would push down causing it to be close to no difference depending on how far up it hovers, although as it's not contained even partially the air that's being pushed downwards can spread uniformly across the plate and escape off the edge. The Closed Lid container, I would think would stay the same, as it's all contained within, even the air that is being used to propel the drone, is in a closed loop with no way of escaping the system, effectively making no change in gravitational potential energy.
Essentially, to hover, the drone has to create a force pushing downwards equal to its weight as not to accelerate in the direction of gravity, so whenever the drone hovers, it's pushing down equal to its weight, and depending on the distance between the plate and drone. The air will either be pushed down equal to the weight of the drone and hit the plate, causing it to detect a weight, or it will be too big of a distance and the air that's being pushed down will disperse and drop off.
The thrust equals the weight
Joseph Elmurr really wouldnt make sense trying again after already watching the video. Just like its pointless to suggest it a month later.
what are you talking about?
I removed it!
If you have a twr of 1
mike big t: dat what she said
I wonder if you could do this but with the drone being quantum locked inside the box and turned to full throttle >.> what would happen then.
It's called ground effect. How far do you need to go above the scale to negate the pressure effects that your seeing. Aircraft don't throw there total weight "down" to achieve flight, a good portion of the lift is achieved from the pressure difference created by the curve of the wings upper surface as air flows over it. In close proximity to the ground the pressure under the wing increases due to compression of the air passing between the wing and the surface it's passing over. This in effect is what the scale is measuring. Ever felt your car rock back and forth when a large truck passes by when your stopped at a traffic light. Your vehicle is effected by the pressure wave produced by the passing vehicle. Even stationary objects effect moving vehicles if they are close enough to the vehicle as it passes, say phone poles, signage, or barriers, these produce the same effect and will slow the vehicle down, but that's another topic.
Fly a drone in a pressurised chamber
he already did
Spoiler: it had a hard time flying
but did he do this weight experiment in a pressure chamber? 0.o
I don't think he did a video with high pressure in chamber, he did it in vacuum. In high pressure chamber drone would have to do less work.
what about free fall ? the scale still at zero when the drone is falling down , there is no force pushing down for those brief moments .
It probably has to do with how quickly the scale measures. If you notice, there’s always a bit of a delay when the weight changes.
Agreed, a much more sensitive scale with fast response time would give a better idea of what is going on.
I think that in an atmosphere this would only really be possible if the mass of the drone were greater than or equal to the mass of the scale. As well as if the drone had minimal surface area/protrusions (like no propellers... or arms). That's all because the force applied by the air would lift the drone up relative to the scale if the area was too great and/or it weighed less than that force.
Ideally, a drone capable of taking off in this situation would accelerate the scale downward, thus making the reading spike up from zero for an instant. That force would read approximately equal to whatever force air is pushing upwards on the drone with; but In turn the drone would make its own acceleration less negative ( more negative = greater downward acceleration).
This is an ideal controlled situation and really it would be better to use a brick. Even better would be to just give up because who cares in the end?
juncear makes sense
When the drone is in freefall, the scale would (once the air pressure changes reached the bottom) show the weight of the drone vanishing. But that's fine, because forces only have to balance in a static equilibrium situation, which free fall is not.
This guy answers my , late night questions for life
I thought the scale would measure more weight as the drone gains altitude, less weight when it loses altitude and stays at 0 when it hovers in place.
I'm not sure if I was wrong. I think we need a more sensitive scale xD
I too think that the acceleration and accompanying thrust would be factorial in the weight shown by the scale. Maybe not the altitude as such, but the rate of change in altitude.
@@williamhawes7005
hmm as long as you are not higher than the walls I think the height might not matter too much.
Since the air that the drone pushes downwards spreads out like cones and walls would focus all the thrust down to the bottom of the box.
I guess the first one will be heavier when accelerating up. But stopping in the middle would come back to the same weight.
While opening the lid, it should be a little lighter, but normally it would be the same condition to the one with the lid.
The one with the flat one, it should get the less weight, because the air will blow out, and the force will not transmit to the bottom.
Guess
No, it is a closed system the only way to affect the inertia of the system is an "external" force. So inside forces don't matter because as the drone produces a force downward it also creates an equal and opposite force upward hence canceling them.
It doesn't mean the drone can't fly( please don't think my first reply as a wrong explanation of newton's third law, it only need an external force and that's the important thing).
Same, less, less. Oh, I took into consideration that the drone would fly away from the scale and box. Cool experiment! 👍
So if a helicopter flew in a box would the downward air crush you?
Maybe, but the force would have to be very concentrated. With an aircraft or helicopter, they likely distribute the force over a large area so it likely wouldn’t hurt you.
Could a drone fly in air bubble in space, and if so, could it move the bubble.
The downward moving air wouldn't crush you because the air would distribute the energy over a larger area very quickly.
One thing this guy cheated is he didn't fly high... If he does that the whole air would not be sent to the ground at the same velocity of exit from the prop due to the turbulence of air. So without this concept, the science when a heli flies above ur head tells u that u r having the weight of the heli on ur head (if at all not full but a fraction which is equal to ur head's area over the prop full coverage ie a circle.)xD
No matter how big this box is, and how high the drone flies, the result is the same.
@@HKragh exactly
But Pressure will decrease when you increase area,force will remain same
What type of things have a Bad reaction in a vacuum chamber?
Humans, for one. Lol
His drone flying skills trigger me 🤣
Same... Except I'm no better... I've had 3 remote control helicopters (just the cheap little things that can't go very far away) and one, big, expensive drone that looks just like his little drone but 15 times bigger and... I kinda destroyed two out of the three cheap helicopters I had (the first one stopped running the bottom two blades cause I'd let it hit things and kept trying to fly it instead of picking it up so the gears and shit wore down and now it flies in circles and the second one I had broke basically the same way, except since I was to afraid to let the blades hit literally ANYTHING as it was running, I'd instantly turn it off when it got anywhere NEAR touching something no matter how high it was so it just kept falling from highs of 5 to 10 to even sometimes 15 or more feet up when it hit or got close to hitting things and I'd just let it fall and crash which eventually broke it as well... It didn't brake so abruptly but it just ran slower and slower like they do when they need to be charged but... One day I had it fully charged and wanted to fly it but... It just slowly fell down to the ground instead) so... Now I'm kinda just to afraid to even TRY flying the two I have left (my last cheap helicopter and my huge freaking drone) because I don't want to break them... Even though it's been like 4 years since I broke the last one... And since then, drones and other remote controlled objects have become a LOT less popular so they probably don't even cost that much to replace and at this point, I could probably get even BETTER ones for cheaper... But... I still don't even dare touch the remotes... :T
Dunning-kruger effect Everywhere...
lol
yeah honestly
I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish.
Could you point me to one or copypaste one here?
@@slehernik why two times the same coments ?
@@spaceexplorationindustry3454 I figured it was 2x more likely to get an answer. 😋😁
I don’t think you would get the same effect with the airplane because you are dealing with a sail effect more than direct thrust. In other words lift, not thrust. Wings and sails create a vacuum that pulls on the convex side. So measuring the force would not be quite the same. Or did I misunderstand what you were saying ?🤔🙂
It works exactly the same way - planes are still exerting a downwards force on the air. All airfoils work the same way - whether they be a wing, a propeller or a rotor. The only difference between aircraft is how they harness those effects
Short answer: no.
thumbs up to save time lol
Corey Newhard Depends how tall the container less
Well, the mass inside the box stays the same, what did you expect?
Christopher Lefont what are you talkin about
Ryan McEntire He doesn't even know lol
Okay so this effect would be equal in case of a helicopter too 🤔
Imagine standing under a helicopter 🤔
Will you feel it's entire weight? 🤔
No because the force the helicopter makes is spread across all the area below it
If you're a flat glass pane 2.5 times larger than the diameter of the rotor of the chopper.... Then yes you'll feel the weight
In Germany we have a bridge for ship traffic only. If I were to image each if the supporting colums were on a scale would the scale show more weight when a ship passes over the bridge?
"I've zerod it now, right now" *Weight shows 1 gram*
Where did you get your degree?
In da interwebs.
black market probably
Freedegrees.com lol
:P at a university
Okay, I haven't read any comments nor have I watched the video till it's conclusion. With that said, I was actually shocked on the results of this test and actually had to think what was happening. I think I have it figured out. After I'm done typing this I will finish the video. But if I were to guess, the drone has to generate enough lift to overcome it's mass or weight which gravity is exerting on it. So the props in the the drone's motors have to offset the pull of gravity to a minimum of the drone's weight to achieve lift. That needed force would equate to the drone's weight in down-force; which would be pushing down onto the scale. Hence the reason the scale doesn't register a change in the amount for force/weight being applied to it. Until the drone physically moves to a position where it is no longer applying down-force against the scale, which leads to the scale registering the lack of down-force/weight to the scale.
Now to see if I got it right...
BTW- Science has always been my favorite course of study.
*1ST*
*To say, "NOT 1ST"*
1st to reply to your not first comment!
The Action Lab AYYYY
I was like wtf until I realised about the downforce created by the drone lol
One small mistake. The quad is not sending 12g of air downward. Its exercing 12g of force on air, but this mostly includes accélération of air, rather than raw mass.
Jesus loves u all so much
Fly a drone in a vacuum chamber
That isn't how it works lol
@@kikoeta ya but would you still watch it tho
@@gigabytemon I mean I can imagine it well enough, it would just sit there and do nothing
36 seconds into the video, and my predictions are as follows: I assume the scale is zeroed to ignore the "tare" of the containers.
The indicated weight will likely decrease very slightly as the drone leaves the surfaces in all the different scenarios but the weight of the drone will still influence the indicated weight...
to a point...As the drone climbs, it's "ground effect" will decrease, eventually reaching zero and a corresponding zero indication on the scale will result. I don't know what the ground effect distance is, as it will be different for different types and sizes of aircraft. I have shown this by launching a tiny gyro helicopter from a tabletop, moved it horizontally past the edge, and it immediately would drop to it's ground effect height from the floor
OK, back to the video to see if I was correct.
>The indicated weight did not even decrease slightly in all three scenarios, likely because the drone never ascended out of it's ground effect altitude. So, I was kinda wrong
Try flying it higher and you will see what I mean by "ground effect". I know about ground effect because I'm a light aircraft pilot, and ground effect always wants to keep a plane flying when you want it to land, but tend to "float" at about 15 feet altitude, so you have to "stall" the wings to get it to touch down.
Can you put soup in a microwave for 3 hours like on simpsons were grampa comes in and spills it all over Marge and homer. Like so he can see. Thanks
Wut?
Pls try flying a drone in vacuum
why? nothing will happen. there is no air to push down on.
@@joosekraft3405 "absolute vacuum cannot be created" the pressure is low it's not vacuum
Talesbougs: A Channel of Historic Tales and Science okay? It still won’t fly. The air will be way too thin
Sees little drone:
That things gonna be really hard to control, what low budget do you...
Sees Mavic:
Oh
You're not a great pilot :)))
The comments section helped. This experiment was close to the ground and made sense. But you don't feel airplanes or helicopters flying above you...right? Wondered about the answer to that...so how high before the ground doesn't "feel" the "weight" of the flying machine?
🧠: Can
🧠: able too
🧠: capable of doing so
BIG BRAIN: can’tn’t
is this like the em drive thing ? pushing the sail boat with a fan?
So if a helicopter flies 10 meters above me i should feel like its whole weight lies on me (and basically crash my bones)?
Q: A vacuum box with a perfectly reflective inside surface is heavier with photons in it or weights the same when it's totally empty?
A: the setup is heavier with photons.
Why: The mass is basically the matters resistance against acceleration trough energy acceptance or dissipation. Accelerating the box will put energy into the photons when they hit the walls so the photons will act as they have mass. E=mc²
The closed container stays at 0 because for the drone to take off it needs to exert 21grams of thrust before it can take off, which is pushing the scale down. When the drown starts to fly up, the box doesn't way more because the amount of thrust extra output is negligible. When he hits the top of the box, he is pushing down at X grams of force, and pushing up on the container at X-21grams of force, therefore the scale will NEVER be anything but zero. Unless you put your hand in under the drone, then the air wouldn't be pushing on the box as much, more on your hand
This experiment was very clearly described and was highly interesting! On my channel you can see the only heavier than air ion thrusters that are verified to lift their onboard power supplies directly against Earth's gravity.
Not disrespectful but it makes sense that props push the same mass/weight of air down as the drone is heavy. For an easier way to understand this is if you imagine next: a body falls at straight down. It reaches its maximum speed due to air resistance (lets say that speed is 120ft/s). Now the job of props is that they need to push down the amount of air downwards to eaqualize the weight of the drone. Now lets say that the drone weighs 500g. That means that props must push down 700 liters of air per minute. It might be easier to say that the air pushed down moves at the maximum speed of the body (120ft/s). That counts for hovering. If you want to go up, you increase the speed of props witch push down more air/push it down faster at; lets say 150ft/s. And if you want to go down, then you drop the RPM of the props, down below 120ft/s; maybe 100ft/s. And because the air pushed down from the props at this low altitude it presses on the glass with the same/a bit lower pressure but it doesn’t make it weightless. Thats couse the mass of air is just rolling around in the box it doesn’t have any air to stop the flow underneath, the only object that does is thet glass
Gravity is not alone. Pressure is another contributing factor to matter sticking together. What is air made of? Gases composed of elements and atoms. In the laws of thermodynamics, all gases can condense into liquids, all liquids can freeze into solids, all solids can melt into liquids, and all liquids can boil into gases at the right temperatures. Meanwhile, they all are constantly putting pressure on each other.
The difference to your videos and those of the others, like veritasium, is that you immediately know the answer at the beginning of your video and there is no surprise or aha moment
can you do a video explaining why the spokes of a wheel look like they are spinning backwards when the wheel is going forwards at high speeds.
2:07 clearly the scale doesn't work, no push and no weight on the scale, yet it scores zero! hahahhahahaha!
What would happen if you stood directly underneath a hovering helicopter feet away from you? Would you feel all the weight of the helicopter? What if you stood in a room larger than the helicopter but without a roof, with the helicopter hovering right above it?
How did you paid the Mavic pro with the controller? I have had mine for over a month without any luck.
I've deliberately not run this video yet, but carried out a thought experiment. I think the weight will remain the same. The weight of the air will not change- no change in volume. But there has to be a downward force to overcome gravity acting on the drone. This will be equivalent to its weight and will act on the floor of the box. Don't know about no box or open box.
Now I'll view the video.
I got the closed box right but didn't comment on the other two. I see that the principle remains the same.
What if u try with 2 meters height closed box, when the small drone almost reaches top what would happen?
Same thing.
@@ThatBoomerDude56 What about in a box that is 2km tall?
@@dgphi For a flying thing, Force in the "up" direction equals Force in the "down" direction. Doesn't matter where it is.
@@ThatBoomerDude56 there would be no down force on the bottom of the box from the propellors 2km away.
@@dgphi If the box were totally enclosed, yes, there would have to be. The world does not run on magic.
As long as the drone is over the scale or the surface attached to it, the weight won't change because the amount of air displaced downwards has to match the weight of the drone or it wouldn't be buoyant. That's why if you fly it off the surface, the scale jumps to the weight of the drone.
i wonder if we put a plant there with all that is necesary for growing , how much of its wheight is the light energy transformed to matter. im very curios what percent it will be. sorry for my english.