Question: does this happen on a larger, like a lake, body of water where lateral waves are not reflected back toward the longitudinal axis of propagation?
Yes it will happen in a larger body of water. You can see it done with a bigger setup here: upload.wikimedia.org/wikipedia/commons/2/27/WaterTractorBeam.webm
Can gravitational waves operate this way as well? Say we took a 1,000 pound ball in empty space and spun it at the end of a long rope. Would we see a 1 nanogram dust particle be attracted by the periodic gravitational waves this generates - in a different mechanism than spacetime curvature from the matter being at relative rest?
I was going to write the same lol. I have been thinking about that for a long time, never got an answer. I wonder, if we consider that light is a very tiny gravitational wave, would be obtain the repulsion/attraction forces by using specific frequencies.
No I think this only works when the waves are reflected back. Here the water moves towards the styrofoam because something has to occupy that space, and due to the standing wave pattern, more water is pushed away at the sides rather than the centre. There would be no such analogue with gravitational waves as they cannot be contained, although I'm no physicist.
I’m not sure if even regular GWs push away objects. All explanations I saw only reference “stretching” and “squishing” of space-time, so any additional movement must be negligible.
Great explanation! By the way, for anyone that's being pulled seaward from the shallows near the shore, it's probably not his tractor beam but more likely a dangerous rip current. So, get out of the water as soon as possible! Also, if the waters are too deep to standup, you will then need to swim across the direction of the current and parallel to the shoreline, until you are free from it. The use of breaking waves can help you get back to shore. If catching your breath is necessary, then try to relax and float for approximately one to two minutes in order to make any progress with getting out of it!
Learned all this at the age of 6. Growing up in southern California by the beaches this kind of survival swimming is so important. Also terrifying being stuck under the waves. Hold your breath, push off the ground, go with the direction of the wave to find air.
I'm in San Diego. I ended up in one and didn't even know it, just chilling treading water and enjoying my first time going to the beach by myself .... Next thing I know a lifeguard truck pulls up and they tell everyone to get out ( I'm everyone ). So I go to swim towards them and don't get anywhere. I'm just thinking I know I'm a better swimmer than that so I swim full stroke... Look up, and it's as if I hadn't budged. I swim again but harder 😅😅😅 And still no where, so I'm just thinking I suck and I float on my back for a second to catch my breath and that's when the life guard starts coming out with the float. I end up getting out and he says I got pulled in by a rip current. 🤦🏻♀️ So obvi. People who were on the beach were like "omg! You were swimming so hard!" And then I look around and I don't see my towel at all... I had gotten swept SOOOOOOO far down, I had a long ass walk !!! I had no clue. I'm sure I could have gotten out of it if I did the parallel swim thing, but the scariest part was not even feeling it. I just assumed it would feel like a pull or something.
The demo at 3:08 actually shows really well how riptides work at the beach, you get sections of regular waves coming towards the beach then small channels of the water returning out to sea!
this is so cook, i especially love the small bits of powder (?) you used at 3:30! It really gives us a great demonstration of this phenomenon! keep up the great work!
I vaguely remember several years back seeing an article about light based tractor beams being used to move very small particles over short distances. If I didn't just dream it, it would make a good subject for a follow up video. Cool stuff!
I was watching Hacksmith industries new video but as soon i noticed Action lab new video i jumped right into your channel. BECAUSE i learn something useful here, not just entertainment.
So cool. I imagine it’s soo difficult continually coming up with new and unique video ideas. Very impressed. It is my sincere hope that you are still enjoying this. Just know that it brings me personally, a lot of value.
@@bitonic589 if you ever have to write in a language you learned by yourself, you'll make a few mistakes too. It gets a little worse when you go to a third language if they all have similarities... 😉😉
I would like to see a larger scale experiment performed with a side view so we can see how the wave amplitude affects the movement of the water below the surface, we are missing out on certain key factors with this type of wave generation and I think all of our curious minds wouldn't mind seeing those effects from a less basic perspective to be fair! It's a great start to a possible breakthrough, you never know who may be watching!🤓🙂
Super interesting, thanks for sharing. Does this phenomenon exist for all frequencies? Is there an amplitude threshold which, when reached, turns on this "tractor beam" effect?
That's a good point. He really should have explained that. Waves, whether in water or electromagnetic are very complicated and there's constructive and destructive interference depending on the frequency. I'm going to guess he created a constructive wavelength that pulls things in but he didn't give enough information for us to know what was happening like you pointed out,let alone any information to use basic formulas and figure it out mathematically.
@@dickJohnsonpeter I'm wondering if there are curls being generated by different phases of the waves and that there are predictable locations in which the curls have opposite directions resulting in places that have reverse flow.
Your Q helped be understand how to answer the whole original Q. Every object has a resonant frequency(ies). In this case the object is extremely flexible to the point of not having a 'real' shape of its own, so it's contained in a bowl/tray. With that its size/shape can be managed. The primary resonant frequency is a function of the shape/rigidity of the object. A violin string when plucked or a piece of metal when hit will resonate at it's resonant frequency. In the water, the speaker-powered foam sets up the vibration, and the frequency is found by trial and error. The foam pushes down on uncompressible water, which has to get out of the way. The wave we see created that pushes outward is *not* the only water moving in the dish. The force goes vertically down, then horizontal when it hits the bottom of the dish, then when it reaches the wall it pushes *upward*. When that upward reaches open air it creates another little wave headed back to the foam. The answer to this possible solution is to measure the height of the water as the foam pushes downward. Yes there's a wave created on the surface, *and* the height of the entire bowl rises a tiny amount.
Thought: in higher amplitude waves is it possible the lower layer of water is moving faster than the upper layer, causing the top to "fall back" while the net effect is pushing the water away faster? So items floating on the surface roll back toward the source while heavier items would be pushed away faster...
This phenomenon also happens with subwoofers in a car, if you have enough and the sound pressure level is loud enough , at specific frequencies ittl start to blow items out of the window when the frequencies are out of phase, when everything is in phase it sucks and blows at the same time causing items to float in the window of the car. You can see some of this on my channel
I really have the feeling this has much to do with reflections from the container, and this is just the visualisation of well known standing waves. It would be easy to verify using the same setup but adding some kind of absorbing material (foam) on the perimeter .
Great video ! For regular waves the force is from the surface and the bottom is somewhat stable .when you increase the the amplitude the force of the wave is now from the bottom instead ,that means an opposite rotation.
Maybe it's like with fast spinning things. If they spin too fast you'll see them spinning backwards, not just imagine that same thing happening with water waves.
Check this out: I realized, by watching the way water flowed from my fridge to a large pitcher, the way the ripples in the glass changed based on how full the pitcher was and how far the stream had to fall into the container. At one point, the wavelength and intensity of the waves, created this tractor beam effect. I realized this must happen in other, similar situations. I then thought, I’m sure it happens at some point during the filling of a tub for a bath. And thus found out, that if your tub has a point where it naturally creates this effect, that’s when you should put in your bubble bath solution, as it draws your bubble solution towards the activity that creates the bubbles, instead of when the water is naturally pushing the solution away. Thank you for coming to TEDTalk
6:49 "So if you are pulled towards the waves it's just me trying out my giant water-based tractor beam" - I didn't know that you joked in thos videos, now I know that you occasionally do ;)
Let me ask you a question ... does anyone remember the show called "Mr. Wizard" ? ... The Action Lab definitely takes me back to that era in a very good positive way
In fluid dynamics, some properties can be measure easily by linear algebra because they have non-zero center magnitude. But some others are not that easily because they oscillating with infinite frequency. In this case we need some advance math to modeling such as Laplace Transform or Fourier Transform. That is why fluid dynamic simulation is the hardest thing for making 3D engines.
I would love to see a demonstration of this in a larger pool so that I could be convinced that this effect doesn't depend on how close the walls of the container are.
This is really cool. I can imagine lots of uses for this sort of thing, from collecting litter, to a safety mechanism that pulls ships away from each other or pushes them away from shallow water. It would be interesting if this sort of thing could be made to work on a mobile platform, like on a ship rather than just operating in water from land. That might make it possible to use it to collect people who fell overboard, for example, or for naval ship interactions. I'm also wondering if similar properties of electromagnetic fields could be used to do the same thing. Is it possible to use this technique to remotely move objects by creating similar oscillations in an electromagnetic field?
Maybe it has something to do with higher amplitude waves "breaking" when they are first formed, causing multiple point sources and an interference pattern, which you can see from the radial lines at 3:25.
Great video that taught me something I did not know. However, also raised a couple of relevant questions: In the ocean, waves dont have a single stationary source so how does water flow towards it? It appears that much of the current is due to having to replace water displaced at the sides of the dish from the lateral motion of the wave, but again, the ocean does not have walls.
It looks like the wave generator pushes the waves to the sides instead of downwards and because of that the center gets sucked in towards the wave generator to fill the lost particles which also creates the current just like in case with rip currents at seashores. It can be seen in the top view with many white particles in the water that the same is happening in reverse when the generator creates normal waves which creates a stream downwards. At the same time the stream is coming back to the wave generator from the sides. So saying that wave generator sucks the water instead of pushing would not be correct, because what is happening is that the direction of the wave changes and the water is pushed to the different direction. I would assume that this effect will be less visible if performed at much larger water body.
This is maybe part of how ocean rips work at the beach, when certain conditions offshore create this polarising or resonance effect, it creates the reverse flow, pulling people out to sea.
Question: what if the source of the wave was more symetrical? I mean this foam has 1 to 5 proportions. What if we took a sphere or a cube or a cylinder instead?
So does that mean there is a specific frequency and amplitude that would result in a net zero movement (not pushing particles away or pulling them towards)?
I'd simply describe it as a hiccup overshoot overdrive effect. As it is mainly caused by the resonating waves adding up exponentially and also rhythmically as well as cancelling, but then also arythmically. This causes the overshoot. The waves get sucked under the outgoing motor waves by the effect of the overshoot of the height and own motion caused by the resonating waves, lastly especially by the arythmic and rhythmic patterns, which are made possible enhanced by the cancelling resonating reflective waves. Maybe to some extent this effect is similar to the capillar force effects per se in some experiments, but it's very simple and more simple than some of the capillarforce effects which are also a bit similar to the vanderwaals afaik. Therefore it's almost like a waterpump overshoot effect in some way. Anyway, this effect should also be provable with sound in some way maybe but doesn't even matter since ez
I think the explanation for this is as follows: The particles of the styrofoam are pressing against the particles of the water. If the oscillation is slow enough, they repel each other, so the styrofoam is pressing the water particles away from it. But if the oscillation is too fast, it "drags" the water particles with it (I guess actually downwards - it just looks like it happens sideways because the water is too shallow), creating a small area with lower pressure between the styrofoam and the other particles of the water so the water itself (which has more pressure) pushes itself towards the styrofoam. Try to look through a transparent container if the particles are really pushed sideways or actually downward. Also try something else than styrofoam. Maybe something with water repellent surface. The effect should be less obvious, I think.
You always make such good videos, both interesting and with good explaining experiments - kinda funny tho since this is the first TH-cam video I've seen, all other has been Reels/Shorts on FB. Now I am subscribed here so I won't miss something since I am less on FB these days! :D
Could you try doing it in a larger container with actuator in the middle, or with actuator matching the width of the container - maybe at higher amplitudes waves caused by the shorter sides of the actuator start dominating (and are still repelling) for some reason, and the wider side attracts to simply fill in the water repelled by the shorter sides?
Very interesting The analogies of different physical effects are amazing. I'm thinking about the radiation pattern of an antenna on different frequencies.
@Kelly Harbeson That makes sense. Interesting! Never knew they were only a few inches high! So wave speed is only affected by depth if the wavelength is of the same order as the depth; is that right? That would make sense.
These implications are much larger than you could ever imagine bro. I've been Audio Engineering for 20 years. There's a lot to frequencies and harmonics we don't understand yet. My mission is to unlock that potential and get us through these super flairs. Side note: Earth has to be hit by super flairs and micronova to regenerate the core. Because, right now, the core is slowing and we're losing magnetosphere.
You already did a video where you put a GoPro inside of a vacuum chamber and you showed us that sound can't reach it, but now I'm wondering what would happen if instead of directly putting it inside of the vacuum chamber you put it in a sealed container with air inside and then you put this container inside of the vacuum chamber, would there be some difference in sound?
Pooling effects at the bottom of waterfalls are somewhat similar, I'm kinda thinkin'... where objects that just went over the falls are contained within the area at the bottom for a time and circulate around, until eventually carried away by currents.
i was just beginning to ponder, before you uploaded this video, about how a UFO might technologically manifest such a tractor beam and if it might be a by-product of their levitation system.
On Sept 28 2022 I saw a bucket floating in the middle of the street moving North with a 100+ mph wind pushing South with whitecap waves exploding into vapor. The next morning all the water was gone along with most of the trees.
Can you discuss or demonstrate this phenomenon of being moved by waves toward or away from a shore as it relates to rip tides and undertows at the beach and what to do when swimming to get to shore?
Could static electricity between your styrofoam wave generator and the objects in the pool be having some effect? Like others, I suspect interactions with reflective waves in a fairly small container and I would like to see the same experiment with a much larger one where reflections are not a big factor.
@Kelly Harbeson Water is not ionic. It is not composed of H and OH ions. It is composed of covalently bonded H2O. You need other ionic compounds to dissolve in water to make it electrically conductive.
Unless he is using pure distilled water, water conducts electricity very well, so charges don't have the chance to build up on the surface of the styrofoam.
@Kelly Harbeson You're suggesting that water in general is primarily made up of ions, which is far from the truth. It is true that there is a very small probability of a collision between two water molecules in neutral water to briefly create a hydronium ion (H3O+) and a hydroxide ion (OH-). But this is an extremely unlikely interaction. The vast majority of water molecules are covalently bonded H2O, not ions. It's a ratio of 555,000,000 to 1. For every single hydronium ion at a given moment, there are 555 million regular water molecules. The ions have a concentration of 10^-7 moles per liter, which is what a pH of 7 means. This is too small of a concentration to have any impact on the flow of current, which is why pure water is an electrical insulator.
Thank you! Most illuminating. Excellent visual demonstration. Cheers from England. Note to self: never upset this person if a neighbour. He will have a perfect science alibi.👍🤭😂
I think your technical just changing the concentrated flow directions in the center Chanel. In the slower waves your still pulling water into your wave generator, just to the sides. There are a lot of people who drown due to effects similar to this. When swimming people get caught in currernts that pull them away from the shore line and they don't realize they can swim horizontal to the beach and get to an area where they can get back. Also, near peers the disturbances to the wave sometime get people trapped.
Hello . I think it is because of Bernoulli's principle. In fact, in the front part of the ball, which is closer to the center of the wave, the oscillation range of the water molecules is greater, so it has a higher speed and lower pressure, and in the back of the ball, which is farther from the center of the wave, the oscillation range of the molecules is lower, so the speed is lower, and as a result, the pressure is higher. and this pressure difference behind and in front of the ball directs it towards the center of the wave
For low amplitudes the 'tractoring' is parallel to the long axis of the styrofoam and for large amplitudes it is perpendicular to the long axis... It might be worthwhile to see whether this is affected by the container's shape. I also suspect that the depth of the water affects this as well.
As someone who has spent hundreds of hours throwing sticks into a lake, then throwing rocks at said sticks, I have seen this many times. I always thought it was the fact that the initial movement of the waves created by the rocks are the surface of the water going down first, then rebounding, so the stick goes downhill first. That, of course was, just my 12yr old mind trying to rationalize what I was seeing.
If I make the floor of "the king's chamber" in the Giza pyramid vibrate/resonate at the right frequency and amplitude ..can I make the sarcophagus move towards me?
Hmmm...several years ago something similar happened to me: I was swimming near the beach, with very small waves, relatively far from a breakwater, and I was carried quickly almost to the breaker (where I would have been smashed against the rocks ). I had to make a tremendous effort to come back. Later I realized that, from the middle of each breakwater to the beach, there was a trail of foam that seemed to be still. Very similar to what is shown in the video.
I'm not really good at this, but the way the directions just changed depending on the amplitude, it suggests that there maybe an equation related to some function that *Is Constant/Gradual Increase to Sudden Large Increase.*
I think of it as the styrofoam actually creating low pressure when the amplitude goes high. When the amplitude is low, it's pushing the water, when the amplitude is high, it's pulling the water.
Could we use this theoretical action of making waves to pull in particles for things such as oil spills and collection trash in the ocean? Making it easier to clean up.
it looks like when you barely touch the water you create a force of push and very low force of retraction, and when the object is more submerge, the force of subtraction the object from the water is bigger than the push, so you have differences lines forces in both cases. when you substract a object from the water, you have to the add force from surface tension, and the buoyant force
If you look up ANU scientists tractor beam you'll find this. They can move the object in any direction using surface waves. They did this quite a few years back
Brilliant...... Were you able to judge the approximate wave amplitude where the ripple wave turned into a choppy wave.? And it so, could you post it please. Thanks.
What if you do this with light/lasers or electron beams? How would it interact when used with the double slit experiment? Or 2 sideways or opposite to each other?
Were the 3 other walls of the container taken into consideration for propagating overlap back toward source frequency? Because there of course would be no 3 other walls on the ocean, could the frequencies be tweeked back and forth starting with a standing node to pull something back towards source?
Can you please use floating sensors to aquire specific data to get more precise information on the phenomena? Just like how they presented in the MOVIE TWISTER but for the liquid instead of the wind?
Is there a sweet spot amplitude where there is no net movement forward or backwards? If you increase the amplitude high enough does the pattern reverse again and start pushing again? If it does, will there be a third flip where it starts pulling again if you increase it even more?
Question: does this happen on a larger, like a lake, body of water where lateral waves are not reflected back toward the longitudinal axis of propagation?
The size of tractor beam will be the deciding factor, also I think can surface tension be responsible for this inward pulling phenomena?
Yes it will happen in a larger body of water. You can see it done with a bigger setup here: upload.wikimedia.org/wikipedia/commons/2/27/WaterTractorBeam.webm
@@TheActionLab it won't happen in a lake or the ocean because reflected energy from the sides is required to make this work.
@@TheActionLab Just watched the video but they demonstrated the effect in bordered water, just like you did.
@@tilak09 I don't think so, but I am not sure. I think has do with waves originating in bumpy sections of water and propagating towards calm sections.
Can gravitational waves operate this way as well? Say we took a 1,000 pound ball in empty space and spun it at the end of a long rope. Would we see a 1 nanogram dust particle be attracted by the periodic gravitational waves this generates - in a different mechanism than spacetime curvature from the matter being at relative rest?
I was going to write the same lol. I have been thinking about that for a long time, never got an answer. I wonder, if we consider that light is a very tiny gravitational wave, would be obtain the repulsion/attraction forces by using specific frequencies.
I like how the chocolate rain guy is also into science 👨🔬
No I think this only works when the waves are reflected back. Here the water moves towards the styrofoam because something has to occupy that space, and due to the standing wave pattern, more water is pushed away at the sides rather than the centre.
There would be no such analogue with gravitational waves as they cannot be contained, although I'm no physicist.
I thought the same thing. We will probably have to wait until the math is better understood to see if it can be applied to space time waves as well.
I’m not sure if even regular GWs push away objects. All explanations I saw only reference “stretching” and “squishing” of space-time, so any additional movement must be negligible.
Great explanation! By the way, for anyone that's being pulled seaward from the shallows near the shore, it's probably not his tractor beam but more likely a dangerous rip current. So, get out of the water as soon as possible! Also, if the waters are too deep to standup, you will then need to swim across the direction of the current and parallel to the shoreline, until you are free from it. The use of breaking waves can help you get back to shore. If catching your breath is necessary, then try to relax and float for approximately one to two minutes in order to make any progress with getting out of it!
Learned all this at the age of 6. Growing up in southern California by the beaches this kind of survival swimming is so important. Also terrifying being stuck under the waves. Hold your breath, push off the ground, go with the direction of the wave to find air.
I'm in San Diego. I ended up in one and didn't even know it, just chilling treading water and enjoying my first time going to the beach by myself .... Next thing I know a lifeguard truck pulls up and they tell everyone to get out ( I'm everyone ). So I go to swim towards them and don't get anywhere. I'm just thinking I know I'm a better swimmer than that so I swim full stroke... Look up, and it's as if I hadn't budged. I swim again but harder 😅😅😅 And still no where, so I'm just thinking I suck and I float on my back for a second to catch my breath and that's when the life guard starts coming out with the float. I end up getting out and he says I got pulled in by a rip current. 🤦🏻♀️ So obvi. People who were on the beach were like "omg! You were swimming so hard!" And then I look around and I don't see my towel at all... I had gotten swept SOOOOOOO far down, I had a long ass walk !!! I had no clue. I'm sure I could have gotten out of it if I did the parallel swim thing, but the scariest part was not even feeling it. I just assumed it would feel like a pull or something.
Action Lab, keeping people generally amazed about random topics since May 2016
The demo at 3:08 actually shows really well how riptides work at the beach, you get sections of regular waves coming towards the beach then small channels of the water returning out to sea!
I’ve always known to swim parallel with the beach but seeing it visualized like this really shows why you absolutely need to
this is so cook, i especially love the small bits of powder (?) you used at 3:30! It really gives us a great demonstration of this phenomenon! keep up the great work!
Analogy of physics at its maximum. Looking forward to seeing more. Space itself vibrates.
It reminds me of charge. If particles vibrate on the electromagnetic field, is it the same effect as charges attracting and repelling?
I vaguely remember several years back seeing an article about light based tractor beams being used to move very small particles over short distances. If I didn't just dream it, it would make a good subject for a follow up video. Cool stuff!
They're called optical tweezers
@@_rogolop cool
Or maybe sonic levitation?
I was watching Hacksmith industries new video but as soon i noticed Action lab new video i jumped right into your channel. BECAUSE i learn something useful here, not just entertainment.
So cool. I imagine it’s soo difficult continually coming up with new and unique video ideas. Very impressed. It is my sincere hope that you are still enjoying this. Just know that it brings me personally, a lot of value.
I feel like I see something new eveytime I see one of your videos. You are incredible. Keep it up.
I'm so happy the Action lab is on youtube! That was just so educational and informative.
If they showed anything worth watching that would be awesome
Imagine someone from the future doing this with gravitational waves
Wow, this man always has a contraption to show the fenomenon he's explaining to us, that's impressive.
*phenomenon
The best part of this channel is that its ALWAYS has fresh interesting educational content thats easily digestible to all levels on understanding 😊
@@Aloha_XERO 🤣 only whwm he's correct. Which isn't 100% of the time.
@@bitonic589 if you ever have to write in a language you learned by yourself, you'll make a few mistakes too. It gets a little worse when you go to a third language if they all have similarities... 😉😉
I would like to see a larger scale experiment performed with a side view so we can see how the wave amplitude affects the movement of the water below the surface, we are missing out on certain key factors with this type of wave generation and I think all of our curious minds wouldn't mind seeing those effects from a less basic perspective to be fair! It's a great start to a possible breakthrough, you never know who may be watching!🤓🙂
Yes yes
This was a very neat setup. I'd never heard of this. I think a large scale usage like plastic cleanup would be incredible.
Thank you so much! I can only remember ever seeing blah null-versions of this type of wave phenomenon until now. Wonderful Stuff!
This is my colleagues paper! So cool to see it referenced on The Action Lab!
What's the paper?
@@ArkienII Link is in the description.
This could be useful in many ways such as collecting objects floating on surface or collecting oil spils.
@Cool collecting oil spills is such smart use for this, great comment
Cool 😂
Super interesting, thanks for sharing. Does this phenomenon exist for all frequencies? Is there an amplitude threshold which, when reached, turns on this "tractor beam" effect?
That's a good point. He really should have explained that. Waves, whether in water or electromagnetic are very complicated and there's constructive and destructive interference depending on the frequency. I'm going to guess he created a constructive wavelength that pulls things in but he didn't give enough information for us to know what was happening like you pointed out,let alone any information to use basic formulas and figure it out mathematically.
@@dickJohnsonpeter I'm wondering if there are curls being generated by different phases of the waves and that there are predictable locations in which the curls have opposite directions resulting in places that have reverse flow.
Your Q helped be understand how to answer the whole original Q.
Every object has a resonant frequency(ies). In this case the object is extremely flexible to the point of not having a 'real' shape of its own, so it's contained in a bowl/tray. With that its size/shape can be managed. The primary resonant frequency is a function of the shape/rigidity of the object. A violin string when plucked or a piece of metal when hit will resonate at it's resonant frequency. In the water, the speaker-powered foam sets up the vibration, and the frequency is found by trial and error.
The foam pushes down on uncompressible water, which has to get out of the way. The wave we see created that pushes outward is *not* the only water moving in the dish. The force goes vertically down, then horizontal when it hits the bottom of the dish, then when it reaches the wall it pushes *upward*. When that upward reaches open air it creates another little wave headed back to the foam.
The answer to this possible solution is to measure the height of the water as the foam pushes downward. Yes there's a wave created on the surface, *and* the height of the entire bowl rises a tiny amount.
@@synchro-dentally1965 That could be.
Perhaps the curls that already exist are rotated ~90 degrees in the areas of constructive interference. Just postulating ideas.
Thought: in higher amplitude waves is it possible the lower layer of water is moving faster than the upper layer, causing the top to "fall back" while the net effect is pushing the water away faster? So items floating on the surface roll back toward the source while heavier items would be pushed away faster...
This phenomenon also happens with subwoofers in a car, if you have enough and the sound pressure level is loud enough , at specific frequencies ittl start to blow items out of the window when the frequencies are out of phase, when everything is in phase it sucks and blows at the same time causing items to float in the window of the car. You can see some of this on my channel
Small things like this lead to big discoveries, keep exploring nature!
I really have the feeling this has much to do with reflections from the container, and this is just the visualisation of well known standing waves.
It would be easy to verify using the same setup but adding some kind of absorbing material (foam) on the perimeter .
0:00 *slick chiptune starts playing*
INTERESTING... IT SEEMS YOU CAN READ MY TRANSMISSIONS, UNLIKE THE OTHERS OF YOUR KIND.
Great video !
For regular waves the force is from the surface and the bottom is somewhat stable .when you increase the the amplitude the force of the wave is now from the bottom instead ,that means an opposite rotation.
I love the understandable visuals you used!
I wonder what the bigger pattern would be if the wave generator was in the middle of the container as opposed to the side or corners.
We need one of these, the size of the Hudson Bay to clean up our side of the Atlantic.
Maybe it's like with fast spinning things. If they spin too fast you'll see them spinning backwards, not just imagine that same thing happening with water waves.
This guy is making viral educational videos from Pyrex and food coloring. I love the authenticity.
I love how eloquent The Action Lab is.
This helped me understand consciousness. Thank you.
Our world and how it functions is simply amazing
Check this out: I realized, by watching the way water flowed from my fridge to a large pitcher, the way the ripples in the glass changed based on how full the pitcher was and how far the stream had to fall into the container. At one point, the wavelength and intensity of the waves, created this tractor beam effect. I realized this must happen in other, similar situations. I then thought, I’m sure it happens at some point during the filling of a tub for a bath. And thus found out, that if your tub has a point where it naturally creates this effect, that’s when you should put in your bubble bath solution, as it draws your bubble solution towards the activity that creates the bubbles, instead of when the water is naturally pushing the solution away. Thank you for coming to TEDTalk
6:49 "So if you are pulled towards the waves it's just me trying out my giant water-based tractor beam" - I didn't know that you joked in thos videos, now I know that you occasionally do ;)
this is really cool, understanding the property waves could help us remove debris from the ocean
this operates similarly to adding spin to a thrown ball.
It no longer just goes straight, but now has additional properties.
Let me ask you a question ... does anyone remember the show called "Mr. Wizard" ? ... The Action Lab definitely takes me back to that era in a very good positive way
In fluid dynamics, some properties can be measure easily by linear algebra because they have non-zero center magnitude. But some others are not that easily because they oscillating with infinite frequency. In this case we need some advance math to modeling such as Laplace Transform or Fourier Transform. That is why fluid dynamic simulation is the hardest thing for making 3D engines.
I would love to see a demonstration of this in a larger pool so that I could be convinced that this effect doesn't depend on how close the walls of the container are.
This is really cool. I can imagine lots of uses for this sort of thing, from collecting litter, to a safety mechanism that pulls ships away from each other or pushes them away from shallow water. It would be interesting if this sort of thing could be made to work on a mobile platform, like on a ship rather than just operating in water from land. That might make it possible to use it to collect people who fell overboard, for example, or for naval ship interactions.
I'm also wondering if similar properties of electromagnetic fields could be used to do the same thing. Is it possible to use this technique to remotely move objects by creating similar oscillations in an electromagnetic field?
Maybe it has something to do with higher amplitude waves "breaking" when they are first formed, causing multiple point sources and an interference pattern, which you can see from the radial lines at 3:25.
Always look forward to your videos, thank you.
Great video that taught me something I did not know. However, also raised a couple of relevant questions:
In the ocean, waves dont have a single stationary source so how does water flow towards it?
It appears that much of the current is due to having to replace water displaced at the sides of the dish from the lateral motion of the wave, but again, the ocean does not have walls.
It looks like the wave generator pushes the waves to the sides instead of downwards and because of that the center gets sucked in towards the wave generator to fill the lost particles which also creates the current just like in case with rip currents at seashores. It can be seen in the top view with many white particles in the water that the same is happening in reverse when the generator creates normal waves which creates a stream downwards. At the same time the stream is coming back to the wave generator from the sides. So saying that wave generator sucks the water instead of pushing would not be correct, because what is happening is that the direction of the wave changes and the water is pushed to the different direction. I would assume that this effect will be less visible if performed at much larger water body.
This is maybe part of how ocean rips work at the beach, when certain conditions offshore create this polarising or resonance effect, it creates the reverse flow, pulling people out to sea.
That was a super cool demonstration!
Question: what if the source of the wave was more symetrical? I mean this foam has 1 to 5 proportions. What if we took a sphere or a cube or a cylinder instead?
So does that mean there is a specific frequency and amplitude that would result in a net zero movement (not pushing particles away or pulling them towards)?
This is exactly what my scientific mind started to ponder after seeing the flow reversal
I'd simply describe it as a hiccup overshoot overdrive effect. As it is mainly caused by the resonating waves adding up exponentially and also rhythmically as well as cancelling, but then also arythmically. This causes the overshoot. The waves get sucked under the outgoing motor waves by the effect of the overshoot of the height and own motion caused by the resonating waves, lastly especially by the arythmic and rhythmic patterns, which are made possible enhanced by the cancelling resonating reflective waves. Maybe to some extent this effect is similar to the capillar force effects per se in some experiments, but it's very simple and more simple than some of the capillarforce effects which are also a bit similar to the vanderwaals afaik. Therefore it's almost like a waterpump overshoot effect in some way. Anyway, this effect should also be provable with sound in some way maybe but doesn't even matter since ez
I think the explanation for this is as follows: The particles of the styrofoam are pressing against the particles of the water. If the oscillation is slow enough, they repel each other, so the styrofoam is pressing the water particles away from it. But if the oscillation is too fast, it "drags" the water particles with it (I guess actually downwards - it just looks like it happens sideways because the water is too shallow), creating a small area with lower pressure between the styrofoam and the other particles of the water so the water itself (which has more pressure) pushes itself towards the styrofoam.
Try to look through a transparent container if the particles are really pushed sideways or actually downward. Also try something else than styrofoam. Maybe something with water repellent surface. The effect should be less obvious, I think.
You always make such good videos, both interesting and with good explaining experiments - kinda funny tho since this is the first TH-cam video I've seen, all other has been Reels/Shorts on FB.
Now I am subscribed here so I won't miss something since I am less on FB these days! :D
Could you try doing it in a larger container with actuator in the middle, or with actuator matching the width of the container - maybe at higher amplitudes waves caused by the shorter sides of the actuator start dominating (and are still repelling) for some reason, and the wider side attracts to simply fill in the water repelled by the shorter sides?
Interesting, James, thanks!
Very interesting
The analogies of different physical effects are amazing.
I'm thinking about the radiation pattern of an antenna on different frequencies.
I knew ocean waves moved in circular motion, but I never knew there was a gradient in speed with the distance from the bottom. Fascinating!
@Kelly Harbeson That makes sense. Interesting! Never knew they were only a few inches high! So wave speed is only affected by depth if the wavelength is of the same order as the depth; is that right? That would make sense.
These implications are much larger than you could ever imagine bro. I've been Audio Engineering for 20 years. There's a lot to frequencies and harmonics we don't understand yet. My mission is to unlock that potential and get us through these super flairs.
Side note: Earth has to be hit by super flairs and micronova to regenerate the core. Because, right now, the core is slowing and we're losing magnetosphere.
You already did a video where you put a GoPro inside of a vacuum chamber and you showed us that sound can't reach it, but now I'm wondering what would happen if instead of directly putting it inside of the vacuum chamber you put it in a sealed container with air inside and then you put this container inside of the vacuum chamber, would there be some difference in sound?
Pooling effects at the bottom of waterfalls are somewhat similar, I'm kinda thinkin'... where objects that just went over the falls are contained within the area at the bottom for a time and circulate around, until eventually carried away by currents.
This is a fantastic Channel!!!
i was just beginning to ponder, before you uploaded this video, about how a UFO might technologically manifest such a tractor beam and if it might be a by-product of their levitation system.
that's a great device and setup you put together for this 👍
On Sept 28 2022 I saw a bucket floating in the middle of the street moving North with a 100+ mph wind pushing South with whitecap waves exploding into vapor.
The next morning all the water was gone along with most of the trees.
Can you discuss or demonstrate this phenomenon of being moved by waves toward or away from a shore as it relates to rip tides and undertows at the beach and what to do when swimming to get to shore?
can't wait to see action lab's water tractor beam when i next go swimming
Could static electricity between your styrofoam wave generator and the objects in the pool be having some effect? Like others, I suspect interactions with reflective waves in a fairly small container and I would like to see the same experiment with a much larger one where reflections are not a big factor.
@Kelly Harbeson Water is not ionic. It is not composed of H and OH ions. It is composed of covalently bonded H2O. You need other ionic compounds to dissolve in water to make it electrically conductive.
Unless he is using pure distilled water, water conducts electricity very well, so charges don't have the chance to build up on the surface of the styrofoam.
@Kelly Harbeson You're suggesting that water in general is primarily made up of ions, which is far from the truth. It is true that there is a very small probability of a collision between two water molecules in neutral water to briefly create a hydronium ion (H3O+) and a hydroxide ion (OH-). But this is an extremely unlikely interaction. The vast majority of water molecules are covalently bonded H2O, not ions. It's a ratio of 555,000,000 to 1. For every single hydronium ion at a given moment, there are 555 million regular water molecules. The ions have a concentration of 10^-7 moles per liter, which is what a pH of 7 means. This is too small of a concentration to have any impact on the flow of current, which is why pure water is an electrical insulator.
Thank you! Most illuminating. Excellent visual demonstration. Cheers from England. Note to self: never upset this person if a neighbour. He will have a perfect science alibi.👍🤭😂
What happens to this process if generated by a floating ship as opposed to the stationary example ?
I think your technical just changing the concentrated flow directions in the center Chanel. In the slower waves your still pulling water into your wave generator, just to the sides. There are a lot of people who drown due to effects similar to this. When swimming people get caught in currernts that pull them away from the shore line and they don't realize they can swim horizontal to the beach and get to an area where they can get back. Also, near peers the disturbances to the wave sometime get people trapped.
super cool man...at what amplitude and frequencies do they happen?
thanks for tell😂😂
Hello . I think it is because of Bernoulli's principle. In fact, in the front part of the ball, which is closer to the center of the wave, the oscillation range of the water molecules is greater, so it has a higher speed and lower pressure, and in the back of the ball, which is farther from the center of the wave, the oscillation range of the molecules is lower, so the speed is lower, and as a result, the pressure is higher. and this pressure difference behind and in front of the ball directs it towards the center of the wave
Depending on frecuency the flow changes of direction...., Could an engine be created using wave generator?
For low amplitudes the 'tractoring' is parallel to the long axis of the styrofoam and for large amplitudes it is perpendicular to the long axis... It might be worthwhile to see whether this is affected by the container's shape. I also suspect that the depth of the water affects this as well.
“Let’s learn about waves!”
*proceeds to replicate oil at the North Pole*
(It’s a joke you’re really a good entertainer)
As someone who has spent hundreds of hours throwing sticks into a lake, then throwing rocks at said sticks, I have seen this many times. I always thought it was the fact that the initial movement of the waves created by the rocks are the surface of the water going down first, then rebounding, so the stick goes downhill first. That, of course was, just my 12yr old mind trying to rationalize what I was seeing.
Great physics video.
Can this be used as an engine? How efficient is it compared to a regular one?
Very interesting. I wonder at the relationships between this and behaviors seen in Quantum Hydrodynamic analogs (dualwalker droplets).
If I make the floor of "the king's chamber" in the Giza pyramid vibrate/resonate at the right frequency and amplitude
..can I make the sarcophagus move towards me?
Underrated.
Hmmm...several years ago something similar happened to me: I was swimming near the beach, with very small waves, relatively far from a breakwater, and I was carried quickly almost to the breaker (where I would have been smashed against the rocks ). I had to make a tremendous effort to come back.
Later I realized that, from the middle of each breakwater to the beach, there was a trail of foam that seemed to be still. Very similar to what is shown in the video.
I'm not really good at this, but the way the directions just changed depending on the amplitude, it suggests that there maybe an equation related to some function that *Is Constant/Gradual Increase to Sudden Large Increase.*
Brillliant visualization. What was used as the white surface flow particles?
I think of it as the styrofoam actually creating low pressure when the amplitude goes high. When the amplitude is low, it's pushing the water, when the amplitude is high, it's pulling the water.
Could we use this theoretical action of making waves to pull in particles for things such as oil spills and collection trash in the ocean? Making it easier to clean up.
it looks like when you barely touch the water you create a force of push and very low force of retraction, and when the object is more submerge, the force of subtraction the object from the water is bigger than the push, so you have differences lines forces in both cases. when you substract a object from the water, you have to the add force from surface tension, and the buoyant force
Wow, your content is of very high quality!
Good work Doc. Keep up the good videos.
I wonder how this concept would apply at subatomic scales
I think they have to use a big piece of foam for a lake 😅
If you look up ANU scientists tractor beam you'll find this. They can move the object in any direction using surface waves. They did this quite a few years back
4:00 TH-cam is having a great time with this spot.
Brilliant......
Were you able to judge the approximate wave amplitude where the ripple wave turned into a choppy wave.?
And it so, could you post it please.
Thanks.
Alway great video !!!
What if you do this with light/lasers or electron beams?
How would it interact when used with the double slit experiment?
Or 2 sideways or opposite to each other?
Were the 3 other walls of the container taken into consideration for propagating overlap back toward source frequency? Because there of course would be no 3 other walls on the ocean, could the frequencies be tweeked back and forth starting with a standing node to pull something back towards source?
Can you please use floating sensors to aquire specific data to get more precise information on the phenomena?
Just like how they presented in the MOVIE TWISTER but for the liquid instead of the wind?
Is there a sweet spot amplitude where there is no net movement forward or backwards?
If you increase the amplitude high enough does the pattern reverse again and start pushing again? If it does, will there be a third flip where it starts pulling again if you increase it even more?