Hydrodynamic Levitation!
Vložit
- čas přidán 25. 06. 2017
- On a stream of water you can levitate light balls of all sizes and even disks and cylinders. The mechanism is not the Bernoulli effect...
Want to make this at home? • Video
My friend Blake from InnoVinci emailed me with a cool idea for a video and footage of levitating balls in water streams. Initially it was tough to explain the physics of what was going on. The standard Bernoulli effect relies on the object being completely immersed in the upward-flowing fluid. But in this case the water seems to form a single stream around the object and it's deflected away and down from the stream. By Newton's third law, the force on the water by the ball is equal and opposite to the force of the water back on the ball, pushing it up into the stream. There is a stable equilibrium position because if the ball moves into the stream, it "cuts off" the water going over the ball so it drifts out. If it drifts out too far, then lots of water passes over the ball, pushing it back into the stream.
Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen
Support Veritasium on Patreon: ve42.co/patreon
Filmed by Raquel Nuno
Slow motion by Hollywood Special Ops hollywoodspecialops.com
Music from Epidemic Sound epidemicsound.com "Colored Spirals 3" "Magnified X 3" "In Orbit 2" "ExperiMental 1"
FAQ:
1. This is similar to the Magnus effect in that the relative motion of a spinning ball through fluid creates a force that affects its motion. It's different in that here the fluid starts the ball spinning and there is an equilibrium point around which there are restoring forces. In the Magnus effect the ball must be spinning to begin with and since the fluid is everywhere it can continually change speed and direction.
2. It's not the Coanda effect. The Coanda effect relies on entraining fluid from the surrounding area creating a region of low pressure. Here there is no water surrounding the stream to entrain (since it is a narrow stream).
3. Adhesion between the water and the ball is important - this is what directs the water flow over the ball.
4. The sum of the forces I show should not be zero but equal and opposite to the weight of the ball. Hence the forces of up and out from the initial contact with the stream and up and in from the spray add to make an upward force equal to weight (the in part of the second force is much more important than the up part)
5. It would be interesting to try this with a hydrophobic coating and see if it still works. My hypothesis is it would be much harder.
6. Apparently there are other fountains and toys that use this principle that I was unaware of. This video uses the design created by my friend Blake.
You can do this with water in air going against gravity - what about doing it with air in water going against buoyancy?
Plus: The ball is hollow.
I am not sure the spray plays any significant role in this as most of it is actually happening at the top so is not providing any up force in aggregate.
I believe some or all these forces are helping maintain the equilibrium and keeping the disc up:
(1) water is not hitting the ball/disc exactly on the circumference. It's slightly inside. That force breaks down into two components: (a) rotate the ball/disc (b) apply upward force which helps counteract gravity.
(2) stickiness to water which applies an upward force as the water is shooting upwards, helping counteract gravity. This also provides an in force I think. Since the ball does not try to push out as it tends to adhere to the water stream.
(3) gyroscope effect for position stability esp for the disk
I thought static electricity between the styrofoam ball and the water would help keep it in place. Is it possible that it actually is true to any significant capacity?
What's up Derek?
His inner child came out when the ball levitated :)
Tell Me This Also he blew my ears.
Tell Me This His clap was so enthusiastic :D!
so did mine
Foo Ming, already ninth month?
Same honestly !
That ball is more stable than this media platform.
MCHappster oooooooooooooooooohhhhhhhhhhhhhhh
i don't get it
Then why are you on this channel
Keith Fuller does it matter?
i don't get that either.
What makes this guy so great at teaching physics stuff is that he is genuinely overjoyed to see how it works.
Legends say that If you say Laminar's Flow 3 times in a row in your CZcams video Destin from SmarterEveryDay will appear.
Destin*
It's just Laminar, not Laminar's
@@AugustTheStag doesn't need a capital L either... :-)
Gotcha.....🤣🤣🤣✌🏻✌🏻
@@AAAyyyGGG Actually it does, because Destin "Laminar" Sandlin has trademarked all references to that type of flow ;)
Use an extremely hydrophobic coating on the ball and see how the lack of adhesion changes it.
PterodactylDanceParty this couldn’t lead to any explanations
@@twitchEmailOkay could lead to some weird magic tricks with friends, give em the not working balls, use the working balls urself, ta da, "magic"
I'm not sure, but maybe the magnus effect will still work, because the ball still (might) spin. But idk
Hydrophobic Aerogel?
Mitchell Vaughan Veritasium’s next viral video is this video but with an aerogel ball.
*that ball is more stable than my grades*
Absolutely beautiful words. A+.
Punctuation. F.
Bucktooth1337 Captial letter at the start of a sentence. D-
It's more stable than my mental state.
...what??????
Best way to have fun and spray your lawn at the same time!
Exactly my thoughts. A fairly random sprinkler system that's massively entertaining to watch.
I wonder if you could put dimples or channels on the ball to alter the spray pattern?
"Watching the grass grow" has never been more fun.
@@Varksterable Omg... You just gave me an awesome idea... What about 10 or 30 of those at the same time? Muahahah
@@8koi139 If you really want a challenge, try collecting and redirecting the spray off one ball to somehow drive another. So only one source to drive multiple balls.
Definitely would be very hard, but I cant see how it's impossible.
Would need more pressure and a much bigger garden than mine, though!
I'm imagining a multicolour disco ball that is light enough to use as a water feature for a pool party.
OMG YEAS
Yeah! Integrate a light pointing up at it and set it going at night, and you have an awesome effect! 😎
Yes and also uses the water as an energy source.
imagine the water bill
Drink every time he says 'balls'
Drink typically implies alcohol so I guess you're too young to understand
Brian Sierzega OK I'll take out my 12 pack of Capri-sun... not sponsored by capri sun :(
69th like :D
Thanks for your input, Bevis.
you mean drink water from dripping dirty balls ?
That is real magic!
@@arindamsarkar2208 No one really cares
No it's physics
@@mikhilkumar4806 physic is real magic
@@Noname-67 why did you reply back to your own statement
Indeed so.
Wonderful video! Inspired me to make a question on it!
Sir, Your problems are gr8 . Keep making more problem videos. I have been watching this channel for a long time now. This channel is ocean of potential JEE problems. You can consider making video on a very good problem discussed on this channel under the name : ' Risking my life to settle a physics debate'.
The system of dynamic shown in this video have high potential to become question in exams like JEE. It combines flotation, kinematics , rotational dynamic and many more concepts.
your question was really amazing sir
@@srsanderson4932 thanks, ill check it out!
@@sakshampaliwal8170 thanks!
dont forget us when your famous sir
4:52 a wild veritasium appears
Veritasium AKA Derek
brilliant Ryan
It is because of the Magnus force. He made a video on.
A wild veritasium in his habitat
Now catch that Pokémon
Derek, it would be awesome to try this with a ball covered in *hydrophobic coating* - if the water cannot stick to the ball, much less of it will be deflected at an angle, probably making the configuration unstable, right?
Petee and a hydrophillic coating.
Yes, this is an excellent idea.
DO THIS!
i was honestly thinking about this righjt before i saw your comment, would b an awesome experiment
Petee it won’t work. You’ve essentially reduced friction. Friction is required to put the sphere or disk in rotational motion.
metwono
thats the point, to see the case in which this phenomenon breaks down
5:07 my grandparents after I fix their tv by switching it off and back on
4:58
He's like an excited child!😃
So early! Awesome demonstration
Grant Thompson - "The King of Random" hi grant dude your here, cool
Grant Thompson - "The King of Random"
Grant cmon you know you've gotta build one and play with it now
Grant Thompson - "The King of Random" would really love if you still did diy
Suh dude
U guys shud collab
I love the child like smile of wonder and curiosity on your face.
Seeing him laugh and get excited makes me happy!! anyone else?
I love it when Derek shows his "OMG this is so cool!!!" face! It reminds me of little children exploring the world and being excited about everything.
I had never seen this before. It's really counterintuitive, but also somehow makes sense.
Would the ball behave the same way if you coated it with a hydrophobic layer?
Probably not because the water wouldn't bond cohesively to the ball, it would be reflected off the ball, pushing the ball out of the way of the stream
Fishface 88 i think you meant to say adhesively not cohesively.
inademv that would be a really cool experiment to try to verify his explanation!!
Sad not to have an example of this in the video. It was certainly the first thing I was curious about.
inademv the boundary layer will still be a layer of water, even if there is a hydrophobic coating.. it might work the same, but an example would have been good. top notch observation.
2:18 PEOPLE ARE SLEEPING IM MY HOUSE AND I WAS NOT PREPARED FOR THIS
Yup same here dude😁
Same here, except I was next to my mother and my volume was high.
@@Killbayne F
I hope you've got your phone back
@@prateekpanwar646
tbh why should she? I'm watching an educational video and guy accidentally yells a bit too loud, just a mistake one shouldn't get punished for.
I love how passionate this channel and its participants are. It makes it so fun to WATCH, as well as gives inspiration to learn more about each phenomenon and the science behind our universe and its various properties. This channel is everything you could ask for: informative, educational, energetic, positive, and interactive. Thank you, for feeding my love for science for 5 years now.
I love how excited you get for science, that genuine love of the mundane is the main reason I love your channel so much. Can't wait to build my own water spout!
Who said this is mundane
It’s not science, it’s nature, science is just the study of it, not it’s demonstration…
Oh come on!!! again! I do a video and when I go to upload it someone beat me to it. :(
😂😂😂
It's ok I'll still watch your video. Do one with ball balancing on mercury stream. Use air compressor to pump the mercury. You can probably even use a basketball.
How come this comment has so few likes?!
I'm a big fan Cody!!!
I like yours better Cody!!
it's so great that there are people like you that demonstrate that physics is more than educational, it is fun!!
The sheer happiness in this video has made my day. Thank you Veritasium!
0:38 I love how his friend was about to say something and he completely cut him out.
he also cut out the link to his friend's video lol
Vinay uppal squad where you at 🥶
yo yo yo!!
🤘
Lmao that cringy teacher who thinks saying yo yo yo is cool?
yo yo yoyo Physics Vinay
lol 😂
@@godson200 It seems cringe at first but after going through the content, it starts feeling good.
In this video, the excitement & joy you show for science and discovery is infectious. You encourage us to be just as interested as you are in this kind of knowledge & investigation. That is a great thing. Thanks !
Ye, i love the enthusiasm shown in his videos, makes them fun to watch too
Amazing, Derek. Keep doing stuff like this, and keep your enthusiasm. I'm glad to be your patreon :-)
this is how we'll reach the sun
LMAO
omg...lol
You can go first and let us know how it is, k?
But, don't forget to go at night, otherwise it will be rather hot.
This is also how we can send fidget spinners into the sun.
I absolutely love your videos!
Halo_ me too
really interesting. I love how happy Derek gets over this phenomenon :D
One of the best experiment have ever seen !!
Dude if you keep glitching the matrix they're gonna unplug you!
NEPAAlchey
🔌
there's a celebration of corpus Christi in Barcelona where they make an egg "dance" in fountains with this very same effect hahaha
it's called L'ou com balla if you want to check it out
I can really see the time and effort put into these videos. Good job man!
This channel makes me happy. All of the videos combined on here. ;) Keep it up!
I didn't think the ball was that cool, but the disc... That was bloody awesome!
I didn't see any blood, just water...
“A hydro what?”- Squidward
Probably the coolest thing I have ever seen
Dude, that was aewsome. Thank you so much! Nice content.
What happened to sciencium?
Red Pinch Thinking the same thing 🤔
it decayed just like Francium.
+Saunterblugget Hampterfuppinshire
So does Sciencium decay into Veritasium?
+Saunterblugget Hampterfuppinshire So, that happened a whole 'decayed' ago?
Had a half life of 4 months
I'm not boin boin so I am hydrodynamic
*S H R I M P*
Ah I see, you are a man of culture as well.
Incredible.... Perfect...... Explanation of hydrodynamic.. 👍
One of the best youtubers every video I can't wait to watch
Alternative titel: Two grown men playing with water and their balls
How about "Two grown men getting their balls wet"?
New toy allows men to wet their own balls. Fun spray action! Get lifted in no time!
Alternative *Clickbait* title*
Two grown men playing with wet balls.
Two grown men get their balls and cylinders wet with squirts of water
(technically those disks are cylinders ( ͡° ͜ʖ ͡°) )
flat earthers: impossible
your amazement for physics is astonishing keep it up
+
awesome...keep finding interesting science demonstrations
Awesome! Love it
This reminds me so much of "l'ou com balla" in Barcelona, it's a very famous tradition here! You should definetly check it out!
I liked the video. thank you Derek. Try posting more videos about different hydrodynamic ideas :) As your videos contain good information to learn and are fun to watch , keep posting them . and good luck!
Nice and amazing way to understand physics
Haha, Derek's like a kid in a candy store.
At 2:14 rip headphones XD 😂
Why did i look at that again .. :D
Yep. Very good sound editing there. A physicist that isn't bothered by audio clipping.
This is the coolest thing I have ever seen
Dear 'Derek Muller" your REACTION IS REALLY INCREADIBLE after disc levitation!!!!
I LIKE IT
This isn't exactly the kind of videos that used to be uploaded, like when I first subscribed, but I suppose this is still content! I can't hate free, science-filled content!
Andrew Kovnat what's your favorite video?
Derek, your content is always greatly appreciated. BTW - 'Magnets: How do they work' for the win!
I really enjoyed the video on Svalbard's seed vault, and also the most radioactive places on Earth. Those videos about phenomenon and interesting stories of culture and Human innovation really intrigue me.
I like how most of your videos, above all, always invoke thinking about the subject in the video. They propose certain ideas I'm compelled to think about, even after I've finished watching.
I like those ones too - I'll keep this in mind. The programming on this channel is not really organized, it's whatever I'm into at the time.
I didn't like episode #237 of The Simpsons, so I wrote an angry letter to their production company.
4:57 this would curiosity and discovery looked like...
Amazing video as always!
This is so satisfying
The force of the spray down cannot equal the force of the water out, the system momentum has to be equal and the sprays in all directions put pay to this theory. In addition this would have no affect on the initial suction of the ball prior to the spin being induced. The actual explanation comes from a common misconception about the lift from airflow being from bernoulli's principle alone. In actual fact a large force comes from the coanda effect, which is the suction caused by the boundary layer on the surface in the flow. If you dangle a spoon from a string and bring the curve under a stream of water under a tap you can see this effect yourself, noting how its not the pressure differential of the two sides of the spoon causing the spoons displacement. This demonstration of the ball in water is much the same. Its the suction of the boundary layer caused by the coanda effect, not the countering momentum of the water droplets, which itself would be minimal. This also helps to explain the natural balancing to bring the ball back into the stream as the effect is exasperated by increased deflection of the boundary until the point boundary separates from the surface and the ball falls from the stream.
ChevronTango now thats a much better explanation. I was thinking the same thing about how the water tossed out cannot balance the force of gravity. seems like dumb people levitate towards the simple explanations jesus christ
Any kid with a hose found this out, It wasn't invented by him.
frognik79 what if he was the first kid to do this
frognik79 He invented that toy though, that specific toy with that specific design.
that´s why I love his channel so much
That was a pretty good kick at the end. Good base for tricking.
BOING BOING
Great you just created a doctor strange portal effect
U celebrate Science....man.... I can see the child like enthusiasm in your eyes....very good... Keep it up
That's a special video! God bless!
4:54
One day I will know happiness at this level.
Its a mission
Love the Video, but where is the video about redefining the kg?
*WHERE ARE YOUR FINGERS?*
coming. They're not actually going to redefine the kg until 2018 so I've got time. But I'll get it done much sooner than that
Just look at the pure joy on his face at 4:55. That enthusiasm is so contagious, I love it!
Greatest teeball setup ever.
I had some confusion about his explanation after watching, so i will explain what causes this effect.
The effect is due two an equilibrium of these two phases:
A) The ball adheres to the water, and uses its torque to force the adhered water downward and away from the stream. This causes the ball to go the opposite direction of expelled water; upward and into the stream.
B) As it enters the stream or expels the water, the torque decreases, and the ball stops moving up and into the stream. The ball then is touching the water at the most outer point on the ball that is perpendicular to the ground, on the side of the stream.
The end of phase B actually increases torque and adhesion, which makes the ball move into the stream as the expulsion of water increases. (edit) This is where phase A begins.
I actually think this is a mixture of rotation, surface tension, a force upwards, and the counter force Veritasium mentions. Water hits the ball, starts to push it up, causing the water to cling to the Styrofoam surface, spinning it away from the water source. The rotation of the ball starts to give it stability and so the water clinging to the surface does indeed get thrown off the other side causing it to not stray from the water source, so does the surface tension and ration though. Anytime the ball gets close and hits more of the stream the rotation is slowed down thus just getting pushed by the water it moves outward. Anytime the ball strays too far its rotation speeds up throwing more water and basically wanting to climb the water like a treadmill. Nothing more I can say.
I think you nailed it.
Wow this made me smile
Ok seriously this is completely awesome.
+
+veritasium , I'm not sure if the explanation in the video is properly adressing the physics behind the effect, what do you think of the following following?
I think the system works like this:
- The water hits the ball (putting forces of momentum on the ball as described by Derek), but also overruling the vanderwaal’s forces of the waterdrops on micro-level, making the water ‘sticking’ to the ball.
- We see water leaving the ball as it rotates.
- So the mass attached to the ball by surface-tension (vanderwaals forces), decreases as a function of the angle (theta) and the rotational velocity (omega). (Differential equilibrium).
{Vanderwaalsforces < m*r*omega^2 --> m_dot (massflow)}
- The distribution of the water over the ball is significant in respect to the low mass ball.
- Radially the mass moment of inertia of the ball is distributed eccentrically in respect to the center of mass of the ball (the rotation point of the ball), by the mass leaving the ball (imagine the leaving droplets 'pulling' the ball, (local/micro level))
Visualize the ball’s wall is always thicker on the side of the beam (system level).
- The sum of the centripetal forces on the side of the beam(collocated-side) > (non-collocated side). The separation of the contribution is located at the center of the ball, which is its turning point.
- The equilibrium exists as follows:
{ Forces of momentum of waterbeam (as function of eccentricity) } + { non-collocated centripetal forces of the water established by vanderwaals forces } = { Collocated centripetal forces of the water established by vanderwaals forces }
Finally a Vsauce video!
...sorry wrong channel
Gurpreet Singh MAtharoo we knew the drill dude...
Everybody has to become a sellout at some point...*sigh*...
*vsauce music porn video plays at the background*
What happened to vsauce?
JonnyRobbie vsauce is making videos for youtube red :) and sometimes videos
Super Superb!! Super Superb!! Super Superb!!
Super Thanks for Sharing!!
Wowow! That's incredible!!!
So Awesome! going try this at home :)
The linked video isn't working, though
Who else want to replace the ball with Derek
Who wouldn't LoL
This is a perfect example of how depressingly important thumbnails are... I have seen almost all your videos (and love them all) but ignored this one for a while... I now feel like a fool because this is one of the coolest phenomena you've shared. Thank you!
Exactly, thumbnail doesn't look too attractive but this video is so great. Thumbnails and titles are important, can't deny that.
You can really see the compression dying with these crazy water droplets flying everywhere. This is actually amazing.
the tutorial for making it a t home is now a private video and can't by watched anymore :( .
+Veritasium : I am surprised that you didn't mentioned the Coanda effect :-/
Turcik because it's not the Coanda effect. "the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and *to entrain fluid from the surroundings so that a region of lower pressure develops.*" you can't entrain fluid from the surroundings if there is no water (only air) in the surroundings. The effect is similar but based on adhesion of the water to the ball and cohesion of the water to itself.
Dude... that's a consequence of the Coanda effect, called the Venturi effect. :/
Awesome... fun effect !!!
had a game like this back in 50's so Blake reinvented it , maybe.
"Fetch me a hydrodynamic spatula, with uh port-and-starboard-attachments, and turbo drive"
Magnus effect?
+Andika Raditya kinda like that just instead of moving ball, stationary fluid it's moving fluid, stationary ball
Exactly what I was thinking.
Exactly what I thought...
That depends on your frame of reference!
Magnus effect is a consequence of the bernoulli effect. So what's in the video is ultimately too, even if it may not look like it.
Physics is amazing
Fascinating thanks!
Mom where did you leave me styrofoam balls I want to try an experiment
2:20 looking at Derek's joy I started clapping ;)
Omg that is the most fun backyard sprinkler toy ever.
I know this video is 4 years old but I would love to see this on a massive scale