Fan Cart - Blowing into your own Sail- part 1 // Homemade Science with Bruce Yeany
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- เผยแพร่เมื่อ 7 ก.พ. 2017
- Here is a reexamination of the fan cart and the popular demonstration of what would happen if you try to blow into your own sail. The misapplication of Newton's 3rd law as used in a children’s storybook and why it is wrong are shown along with some other variation suggested by viewers are tested in this latest video on the fan cart. I have intentionally tried to keep it’s explanation in simple terms for younger students since there are several higher level explanations already available from a variety of sources on the internet and here on youtube.
Note on comments: I appreciate seeing comments positive or negative, and learn from helpful criticism. However, I am a middle school teacher and many of my students visit this site, I will remove comments that I feel are offensive or inappropriate.
The moment you think "what if..." and that badass in the video does exactly that. Happened at least 3 times in that video, as usual. Thank you.
L3 P3 i love it when that happens
L3 P3. Exact!!! Same happened to me. This guy is a good teacher, the kind that knows the questions before being asked.
I get SO EXCITED when you upload.
Thanks Destin, I appreciate it, but I think your videos are quite a bit more exciting than mine are
Joey Marten maybe
I love both your videos ❤
wow i expected this to be a fake channel
me too. I like both channels... Bruce is really smart...
Teacher I see in your eyes the brightness when teaching, the world needs more and more people like you, I subriscable on your channel and touch the bell, congratulations for your work I've seen almost all your videos and they really are very educational!!!!
J. DArtagnan A. O. Most teachers always start out like this, and then over time they get the "dead inside" look because the children eventually corrupt them. This man just appears to be more resilient
Ders JuanPablo These days, I really believe what you're saying, but I'm glad he keeps going anyway. Grateful for your comment
I love what I do, You can't get bored with science
Bruce Yeany "You can't get bored with science" - I do understand what you're saying, and truly believe this is GREAT.
The moment I read your post, however, I immediately thought of what feels like a current wave of "anti-intellectualism".
As a teacher well-rooted in science, what do you think about that? Does this "anti-intellectualism" really exist, and if so, what can done about it?
Thanks in advance for your (and everybody else's) thoughts on this.
(I'm not a native speaker, so please pardon me for any mistakes in my post.)
Groups coming up, saying that the earth is flat and does not revolve around the sun, others saying that the world came up 6000 years ago, really a lot of anti-intectualism coming up, why? Which cause Complex question to be understood. One more reason to have teachers like "Bruce Yeany", who playfully continues his work !!!, again I congratulate you for your work and others like you in other parts of the world !!!
Another great physics lesson that I can tie into my Maker Lab class, while getting them to build some fun things. Thanks yet again!
Love your videos, wish you were my science teacher.
i wish he was mine too..obviously he still is ahahah
Oml me too. My science teacher 100% ignores me. I ask for help, he says "after I'm done helping this student", someone else asks for help and he helps THEM instead. We had to build a freaking ROBOT. My partner and I had no clue what we were doing and we were the only ones to not finish
I hate those kinds of teacher! You should have went online and build a badass robot and plow the school down with it!
Exploding Legos Agree! This was very cool indeed. Thanks. I had no idea. You just upgraded my o.s.. it's 62 years old.
You're right! But I'm homeschooled now, it's over :)
God dammit every time I look at that title I see fart can.
You sound like a real smart feller. ;)
And you're a fart smeller, Meg!
I thought I was the only one.
Dammit you beat me to that comment!
TheAussieStig30 yes I'm not the only one 😂
As a physics teacher, I support your initiative to create such good educational content. Really demonstrates the theory well, including the unexpected cases. Well done! I'm sharing this with my students.
I WISH YOU WERE MY TEACHER!!!! All my teacher are like machines the spew out information that I spew back on a test. This is really how most people learn. Keep this up and keep having fun!!
I would have loved to have a teacher like you back in the day. I'd probably be a scientist today.
I wish you were my teacher. Love your videos prof!
What impressed me the most about this video was that a middle aged man was still amused enough to chuckle a little bit at the sight of the experiments results. Kudos to you man. Still living the dream.
By far, the best comparison of how a "target thrust reverser" on a jet engine works.
I'm very grateful for this.
From Brazil🇧🇷🇺🇸.
who else read this title as " can fart"
then re read in disappointment
I read "fart cart".
Good jub
Fr. Spooner also read it that way
Fr. Spooner also read it that way
It first reached my brain as "fart can"
Have you tried putting a keel on the boat? With the sail at an angle producing spin, would a keel act to force that into linear motion?
HI Peter, there is another video that follows this one where I tried some other ideas, a keel / rudder helped
Best science teacher I had in school. He always had fun experiments for the students to try. Thank you Mr. Yeany!
Thanks Isaiah, it's great to hear from you and I appreciate your comment.
I love how passionate you are about the science in your videos, those laughs when you were testing the carts showed that :) We need more teachers like you!
love your videos! greetings from brazil!
thanks Felipe, nice to hear from Brazil
+Bruce Yeany (Yeany Science) hi what's up
Felipe Luiz Dickmann And I thought I was the only Brazilian watching his wonderful videos :)
Love your videos! Greetings from Thailand!
Portugal here! Greeting Bruce and Brasil.
DAMN HE DISSED THE FUCK OUT OF WILY COYOTE 1:55
please keep this stuff up. it is getting harder for people to lean science. and with the edu secretary i don't know whats going to happen.....teachers are the most valuable resource
if all teachers were as enthusiastic and imaginative as Mr. Yeany, the world would be a better place for kids and education.
I wish you were my science teacher :O
Connor MacLeod he is.
hans aww...
Me too..
Don't listen to 0:56 with headphones. You've been warned.
I'm not seeing the issue. My headphones handle the squeak just fine.
Jack Evans my headphones handle it well too. It's my head and teeth that grind with it.
Madman....You're a madman!
You've just changed the overseas shipping industry forever!
Thanks to you I've already begun patenting cargo ship sized large Cardboard curved sails and fans....We're gonna be RICH!
LOL, denied, mine's already there
4:13 that small laugh and excitement shows his love in the subject.
I still don't get why is there a net force on the curved sail when it redirect the air backwards. I do see how redirecting the air backwards in general produces a force, but what I don't understand is why it isn't balanced with the fan's force on the ship.
Let's say you have a powerful laser as the fan and a perfect mirror as a sail. The mirror will redirect light backwards and create a force on the sail. So, will the force from the laser be balanced with the force on the mirror? And if so, how is this model different than the ship with a sail and a fan?
Really excellent point. My best guess is that not all the air is being pushed perfectly forward by the fan but is still caught and reflected backwards. This would be like having a laser at 45 degrees to the mirror. Then you'd expect the mirror to move away from the reflecting side. But if there was something restricting it's motion in one axis, e.g. floating on water, it would move perpendicularly to the input laser beam. Bruce, could you investigate this? maybe with a smaller curved sail only capturing the air moving perfectly forward?
Clearest example is an elastic collision.
m1v1 + m2v2 from before collision = m1v1 + m2v2 from after collision.
For example a basketball hits a stationary person.
If the basketball comes to a complete stop (hits their chest, stops, falls from gravity)
1kg*100m/s + 100kg*0/ms = 1kg*0/ms + 100kg*1/ms
100 total before and 100 total after, the momentum has been transferred completely from the ball to the person.
If the basketball instead of stopping hits them and bounces straight back at full speed.
1kg*100m/s + 100kg*0/ms = 1kg*-100m/s + 100kg*2/ms
Now to get the 100 total after, we had to account for the ball moving backwards at 100m/s after the collision, which required the person being hit by the ball to move TWICE as far backwards simply because the ball bounced instead of stopping!
If the fan moved the air, then the sail stopped the air, the boat would stand still.
If the fan moves the air, which hits the sail and then bounces straight backwards, then the sail faces twice as large a force, it is responsible for stopping the air (a force) AND sending the air bouncing backwards (a second force)
In the flat sail where the air moved sideways, instead of backwards, this air was in a different direction in space (not forwards-backwards) so it didn't exert that second force either forwards or backwards.
You're absolutely right, thanks for reminding me of the formalism. I checked the steps including the fan starting to move the air in the first place and sure enough if the air is going backwards at the end then the boat will move forwards. I think this demonstrates how used to thinking in terms of closed systems we get. If you were on a boat bouncing a ball off the mast you wouldn't get anywhere. Similarly, if Bruce put the fan in a box then the boat wouldn't move forward no matter the shape of the front of the box.
Ciroluiro its really confusing haha, you’re not the only one tripping out lol. Let’s assume you’re standing in the back of a sailboat. Instead of a sail there is a solid wall. Let’s also assume there are no losses and all collisions are perfectly elastic.
1. You throw a ball at the wall.
2. The moment the ball leaves your hand, the boat gains momentum equal and opposite to the ball, so it begins to move backwards.
3. When the ball hits the wall and ceases to move with respect to the wall, both the boat and the ball have no velocity. At this point the net effect has been that the boat moved backwards.
4. Now since the collision is perfectly elastic, both the ball and boat begin to move in opposite directions to what they were before.
5. Now the boat begins to move forward and the ball moves backward.
6. Eventually the boat reaches its initial starting point. But notice the boat is still moving forward.
7. Time continues and the ball is now outside, behind the boat and continuing. The boat is now ahead of where it started and continuing.
8. The boat and ball will never meet again, so the boat will continue to move forward.
This is the simplified explanation of what is happening, but it captures the fundamental effect. Of course an actual ball will be falling due to gravity, but we assumed it wouldn’t because the ball in this case (air) is the same density as the air around it. All the losses we neglected due to our assumptions are apparent in the actual experiment in the video, which is why it’s more effective to have the fan without a sail.
If you measure the forces on the boat with the sail and fan and have a high speed camera, you’ll see that moments after the fan starts spinning the boat will feel a force backwards equal to that of the no sail case. Moments later that force will become balanced out and moments later it will become forwards.
Bypass air, like a jet liner engine, the exhaust from the fan isn't what provides most of the thrust, it's the bypass air which is carried with the exhaust
what if the air is being sucked in from the front and directed and blown to the sail. Could you try this experiment with a pipe that bends from the back of the fan to the front so that the air source would be in front of the ship rather than the back?
Unfortunately, this wouldn't work either. The air that hits the inside of the pipe at the bend would cancel out the force of the air being pulled into the pipe by the fan. Likewise, the air that came around the bend would push back on the pipe, canceling out the force of the air hitting the sail, resulting in the same problem.
I'm not sure it's as simple as that. The fan sucking the air out of the bent tube creates a slightly reduced air pressure inside the tube so the higher pressure air outside the tube would produce a force on the tube and since the area of the outside of the bend is greater than the area on the inside of the bend there would be a net force equivalent to the curved sail scenario, or at least cancel out the force of reversing the flow you describe.
If you used the bent tube and then the fan blew the air into the bent sail you would have the equivalent of a jet engine with an S shaped airflow internally.
The main issue being the source of air is just as important as the out. The fan is = to a person sucking air from one direction and then rotating 180 degrees then blowing it out. If the people on the ship were blow to the back to move the ship forward they would have to spin towards the front and breath in the air to be efficient. If they were standing still breathing and blowing in the same direction they would definitely have an issue.
No its not important where the air comes from... You automatically push backwards (as a human or a fan) when you blow the air. Imagine solid air: where does the force for the sail comes from? From your lips (as a human) or the rotors of the fan! Ther source therefor is not important!
Lower the air pressure in front of the sail and it will pull forwards.
I don't get tired of watching your videos. You are an amazing teacher
For everyone who wishes that he would have been your teacher: Well he is now.
Thanks Mr. Yeany, people like you make this world so much better :)
Wow, thank you, that is a really nice comment
@Bruce Yeany
Being honest, there appears to be a physical phenomena occurring that your are not explaining/avoiding.
Look at your own results @1:44, obviously the cart moved further to your right... Table uneven, room ventilation, imprecise wheel bearings, other?
Help us understand by examining more closely.
Thanks!
looks like it move a bit, I'm not sure why, I went through all the video footage and that is the only spot where I've seen it. but I've had so many questions on this video that I am going to try it again next week, more sails, stronger motors, we'll see what we can get out of it, thanks
That might be a result of the wheels hot turning at the same rate due to alignment or placement giving one or more greater resistance .
nyyght7 obviously the force he applied to the cart is not the same, he could apply slightly more force to the right,
It could also be the deflected air that is more evident in the water.
I know I'm a bit late, I think it might be the draft behind the fan.
Fan interaction is good for your youtube channel ;)
annoying*
I love this guys videos, His voice also makes it 10 times better.
Kids need this, and so do adults. So many people reject reason, logic, and evidence. This i a great example of all of the above. Thank you for your time and effort! I see value in your effort!!!!! :-)
in a real boat, the sails are used at an angle, and function more like the wings of a plane than just a surface the wind pushes on. Would it effect the experiment if you used a proper sail? I think it could because then your wind would be coming from the side of the boat (which is when a sailboat is fastest) so it wouldn't cancel out the forward force of the sail. Great Video
Andrew Laroche
then the force on the sail would be even weaker since the wind hits at an angle instead of perpendicular to the sail so the boat would move backwards due to the force of the fan being stronger.
It doesn't matter, the air is being pushed forward _from_ the boat, rather than the air coming from a separate source, and gets deflected off in a direction.
Adding a triangular sail would only cause it to spin around in a circle, as could be inferred from 6:32.
Andrew Laroche - Your point is totally correct, sail boats do not just get blown downwind as this video shows. Wind comes from all points except directly in front of the boat. I don't see how the experiment would be set up so as to cancel out the effect of the fan just blowing the boat forward, but as you noticed, this video doesn't address real sailing physics.
Terra Estrahl no what he's saying is accurate even for ships that are used as the example (such as galleons or old pirate ships) they are meant to catch the air so they form the shape of the solid sail in this video, this isn't shown in the video because the sail he uses isn't able to flow with the wind and catch any of it, which is what a sail is supposed to do. If he had fashioned a sail that was more loose and able to move and flow then the experiment could've turned out differently
Dj Hendricks The experiment would have turned out the same regardless what kind of sail he used. It's akin to putting a jet engine in place and having that energy push the sail forward. The engine would push the boat backwards and the sail would try to drag the boat forwards.
The sail need to have a more slack material that will catch the wind better as now just too straight and tight. Recon if it was good fabric it would bulge in a way it would have worked.
This. if the sail had some slack, it will bend and redirect the air back from the top and bottom of the sail instead of sideways in all direction.
A real sail on a boat have some slack to it is not so stiff, if it bulges the right way it will direct the wind back.
I saw the cardboard, but he should had made a sail design with fabric instead of plastic foam.
The test boat also needed a keel and rudder.
I was thinking the exact same thing, but the cardboard was a pretty genius idea, but the paper wasn't real sails.
After watching some of your videos, you see like the best teacher ever, a good teacher can inform you about a subject, the best teacher can change your perspective of the subject and get you interested in it ( no offence to Mr O'Reily)
Excellent way to address controversy from the previous attempt at this experiment. You hit just about every aspect of this test. Thumbs up for me, keep it up! Great Videos.
Is this what you do during your free hour during the day Bruce?
LOL, I spend a bit more time than that, it's more like an obsession, I tinker and see what happens
Luke Martin How dare he do science after science, ALLAHU AKBAR!
👌🏻
Can Fart - Blowing into your own Sail
You are the definition of a good teacher.
Bruce, well done. I wish there were more instructors like you.
"As hard as I try I couldn't stop the boat from spinning."
TURN THE SAIL AROUND! Also boats have keels to stop them spinning . . . yours is a barge, not a sailboat.
The first experiment with sail and fan when pushing it backwards it stopped almost instantly. Pushed the other way it rolled before coming to a stop and on the second try it rolled forwards a couple millimetres after coming to a halt after being pushed backwards. That suggests an imperfect system with a lot of friction. On the water he had the sail backwards with the mast in front of it and no rigging so the sail wasn't allowed to billow . . . as it would in the stories. the card sail is the best representation of the stories.
Really annoys me when people have such a simple grasp of high school physics and sound off like they're an authority when applied to the real world then fudge the execution and results of the experiment to prove their point.
See if part two is any better, I tried to clean up my mistakes.
I would like to see that.
misread the title as can fart, very dissapointed
you are the greatest. you make me feel like I'm in high school all over again and it's so nostalgic
I love these kinds of physics experiments.
Thanks for posting!
who here read the title as fart cart or fart can
Golden Ideas & DIY sadly me I got excited thinking what is this and then re read the title in disappointment
Finally a good experimenter. I was in an almost endless discussion with my fellow physics professors who are not fluid dynamicists.
I have been thinking about if this works for years, thankyou for clearing this up
Bruce your videos are the BEST!
One time I made a joke about putting a wind turbine on the top of your car to catch all of the "free" wind and generate electricity while you're driving down the freeway. My mom took me seriously until I explained to her why it wouldn't work. It's interesting how some things are intuitive for some people, but not so much for others.
I love demonstrations like this where you can actually visualize these principles (newton's laws). I think that "practicing" like this (making predictions, thinking about cause and effect, performing a controlled experiment) can help to improve people's intuition about the world around them. If everybody in the world had a "Mr. Yeany" experience in their life, I imagine that it would improve our collective world understanding (breadth, not so much depth) of these basic principles and make for a more enlightened society.
Or we could appoint a secretary of education who thinks that there should be more guns in schools... ya just never know about them bears, huh? lol
These experiments are really nice.
You have a lot about air dynamics at a simple and easy to understand video. Thank you for posting.
Bruce you are an inspiring person, keep on doing what you're doing. God bless you man.
I didn't expect those results. Thanks for the great videos.
If I had teachers like you when I was in school I probably would have graduated. Your students are lucky.
MYTHBUSTERS Not only did you bust the myth, but you also went as far as you can with it, till you can't go any more. Well done and I pressed "like".
A very good explanation. Thank you.
awesome video! so simply explained, just great!
Absolutely bloody brilliant video.
I had come to exactly the same conclusions as this video did in practice from considering the different scenarios, although I didn't bother consider the scenario of a curved sailed pointing away, and indeed that scenario behaved as I suspected as a less efficient form of the cart without a sail.
Doing it on the water as well was another excellent test.
The build quality of the little carts and sails and fixtures was excellent as well.
This is a really awesome explanation. Thank you so much!
Disturbingly phallic balloon aside, this was a really, really nice video. Thank you for the hands-on demonstrations, especially the on-water tests. I sincerely wish my physics teacher were this awesome.
Mr. Yeany!! I can't believe your still making videos!! You are by far the most inspiring teacher I have ever had! and with 67 thousand subscribers to boot haha :) keep up the good work.
From, your former student, Brandon M :)
Just to add, triangular sails function like a wing. Creating a low pressure by angling the sail to cut into the wind like a wing before stall. A keel is needed to keep the boat moving forward.
I didn't expect to learn what I learned here! What a great video!
It's like doubled wings in both directions. Intuitive.If people feel it, they will learn it. Brilliant
I wish I had a science teacher like Mr. Yeany when I was a kid.
Thanks for this video Bruce. It's a fun way to learn about physics!
I read title as 'fart can' and now I'm ashamed of myself. First time I've seen one of your vids. Loved it!
thank you
Bruce, Outstanding as always. Thank you
Great video! Before I had witnessed any of your solutions to this dilemma, I thought a good way to solve this was with a sail that angled back toward the fan or a fan that angled back aimed at the top of the sail. I realize that you don't want lift, but there may exist a happy medium in there. I would imagine that a combination of both might create the desired result. However, the curved or cupped cardboard version you came up with is probably the best option. Cheers!
Your videos are so cool, very entertaining and teaching by fun and playing, subscribed without hesitation!
That was a very good demonstration. Well done.
The principle of action and reaction is very valid and applicable that far i have gone for now across all your presented samples and applying it to them.
* A fan blows air into one direction whilst it sees exposed to a force in the other direction.
* A flat sail seems to redirect an air stream to both sides (great method of proof with the candles!) and thus first stops the air stream by action force against its original direction so the sail gets a reaction force in the original air stream direction. for the fixed fan with moveable cart the flat sail equipped cart sees accelleration. for the cobined cart with mounted flat sail and fan both items create an equal but opposing force (assumed that all air is impacted in the same manner by the sail). this will only bend the structures in between them. but wait - the second effect of the sail is are two roughly equal air streams to the side. so there are two forces accellerating each half of the air to the sides. Cause? The structure of the sail is flat... but wait the first stopped air is creating a preasurized area... that means an air volume that would like starting to expand to any direction. the oncoming air will not allow as well as the sail wil not allow but the sides are open - and guess if you would be able to put a candle above or below the sail it will as well see a wind stream. but see the flat sail is in the full scenario not exposed to the direct force of the oncoming winds but by the pressure the "stopped" air bubble is creating to all sides including the side of the sail. so the forward force on the sail is of very indirect nature. most of the air's substance never even touches the sail but it's force and energy is handed over to their neighbours making only the relatively few ones in contact with the sail finally transfering those attributes to the sail. now black boxing... regardless on how the pressure area looks like, the result is an air movement to roughly the sides. i say roughly because neither the sail nor the fan would create an air stream is expected to be perfectly in dimensions, its just sufficiently good. as the resulting air stream is moving more like a circular surface wave from a stone that is thrown into some lake its causing action would hint for a center of origin with all action forces pointing starry to the outwards from a theoretical center while all are living in the same plane.
side note 1: what is really going on? the energy of your batteries that you used for the fan is converted using multiple physical effects in sequence so that finally an air stream is leaving the setup that is expanding mostly with a circular front and in parallel to the surface of the sail. the energy is gone to the expanding air and that is what energy often does... maximzing entropy.
side note 2: guess why it is so hard to balance the "flat sail + fan on water" variation to not start turning? because it is so hard to keep the presurized area sufficiently symmetric. imaging you are trying to balance a disc on a pin and then pouring water onto it - hopes are small that the water will flow to all directions i the same fashion. this is much more true when it comes to a flat paper sail that will be able to bend depending on the force the stopping preassure applys to it.
conclusion:
the flat sail+fan vehicle is a "trap" for the air to build up preasure so that the air (as an energy carying medium) will vaporize the energy from the battery in a balanced fahsion. thus no motion. any change in the base setup that will break those force balance thus will create some driving force that might at least for some cases lead to a motion of the vehicle.
but you were using rather force than energy - and the balance of force in the setup can be shown in general and even on the very spot:
a total deflection of the air stream (forming it into the circular expansion shape) is of course a force that is finally attached to the sail with one direction forward and a second direction outwards. (the first one is a classic actio-reactio "hard ball" force whilst the second is more of a surface friction force but still is much of actio-reactio but in a harder to see "slow down the stream fashion" with rather mostly undirectional thermal (=micro motion) energy in the result than some linear motion. objects rarely start a motion into all directions... their internal structural force limits will not allow - unless you spin some flywheel shape beyond its limit. why not spin a sand covered disc at increasing speeds?) if you would attach a bunch of little strings to the center of your sail with e.g. foam cubes on the other end... then you will be able to see how the air stream pulls them apart in a cirucular fashion. and this will show (in a macroscopic model fashion) the circular pull of the force on the center of the sail. of course putting a few water drops on a horizontal surface or attaching many little strings with film tape onto the surface
BTW: you could easily put a cone alike object in the center of the sail - no change.
or you could exchange your two-tubbed sail shape with a bunt cake pan (half'ed toroid) shaped one, thus looks like a circular tub.
PS: your wheels on the vehicle will be able to create a high side force (slipping resistance) for keeping track whilst they will have a low force (low rolling resistance) into the rolling direction.
that's a very complete examination of the demonstration. Interesting, originally I thought I was showing a basic example of action reaction and it appears to have involved into a problem that is much more complex. I am going to try this again next week with some other variations to address concerns brought up by several viewers. I will try what you have suggested and see we can get, thanks for your insightful comment.
You are great physics teacher. Thank you for your videos. It is a perfect inspiration.
Another lovely video, I'm keeping a 100 in my 8th Grade Science Class with the help of your videos!
Here's a funny experiment. Could you, when the boat is spinning in the water, have some sort of spiral-looking sail under it to channel the water behind it, and maybe converting some of that rotation energy into forward motion? That would be cool :) Thanks for making these!
Love this! Thanks for demonstrating!
Awesome demonstration Bruce. I had such a big smile on my face as I watched it. lolol
Big thumb up for me !...
Very good, you covered all the points.
Excellent demonstration. Subscribed!
this teacher makes learning fun !!!!
Great video. Thanks for sharing this!
Science is wonderful, and you teach it so well.
I made one of the comments which amounted to the source of the wind, which you dealt with using the balloon, and my thoughts were dealt a 'blow'. I did consider the shape of the sail, but didn't mention it, so I'm feeling stupid twice over - thanks 😆. Love your videos Sir - perfect demonstrations.
thank you Ian, we're all in this together, making the video is a learning experience for me also, I've had suggestions that I never thought of and have been corrected quite a few times by viewers when I don't get things right. Plus there are times when I have no idea what will happen, for example I was not sure what to expect when I put the cart into my homemade pond.
I wish I had a teacher like you when I was in school.
Awesome channel, great experiments. I feel like a child watching your experiments. Greetings from Bolivia.
wow that's really interesting effect!
You obviously have a passion for teaching science ! Wish i could be in your class !
I was surprised! Thanks for this Video! Good Job!
this is new information to me, well explained, i like your spirit, Mr. keep up! 😁
Excellent examples of Newton's Laws of Motion! Thanks for your demonstrations!
I love your videos! Thank you for teaching and thank you for sharing your videos with us. =)
this video blew my mind!
Great video! Thank you!
This is really cool. Definitely something I wish I had been doing going through middle school instead of textbooks. I don’t know if it would be instructive to middle schoolers to include a history of the development of transportation. You can see what were successful and then try things that weren’t tried or were tried but failed. This way the students get a feel for experimenting. Something like: why did they go the route of paddle wheels instead of a fan blowing in the back of the ship when steam power came along? Why also did they used the propeller screw later and not keep using the paddle wheel? And why did they not hang a couple of jet engine on the sides of a ship? So then the students would be looking into the concepts of momentum.
You are so funny but you teach us very well, thanks.
4:10 it's like he proved it to himself on camera. Best chuckle ever!
There have been several times when I am in the middle of making a video and an idea comes along so I test it not knowing the results. Many shots are the first time I have tried something
I was like a kid again in science class. Great video
Thank you for the video! I'd be interested to see a demonstration of how a boat can sail at "close haul" to the wind - intuitively, that seems impossible, right?
I have a vague recollection of the physics involved, but I'd love to see you explain it!
Great video! Not sure if this would result in a different outcome, but I'm curious to see what would happen if you used the balloon with the cardboard sail.
I liked the cupped sail demonstration -- close to how a Harrier jump-jet worked by vectoring thrust.
Great video, i really love your enthusiasm :D
Pretty thorough investigation. I like ^^