Floating Balls and Lift

Floating Balls and Lift - Numberphile

Рет қаралды 234,525

6 жыл бұрын

Tadashi discusses pressure and lift... with a toy of course!
More links & stuff in full description below ↓↓↓
Lift and wings on Sixty Symbols: • Lift and Wings - Sixty...
Tadashi Playlist: bit.ly/tadashi_vids
You can buy version of this toy on Amazon: amzn.to/2MLfpSC (affiliate link)
Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumberphile
We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. www.simonsfoundation.org/outr...
And support from Math For America - www.mathforamerica.org/
NUMBERPHILE
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Subscribe: bit.ly/Numberphile_Sub
Videos by Brady Haran
Editing and animation in this video by Pete McPartlan
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Brady's videos subreddit: / bradyharan
Brady's latest videos across all channels: www.bradyharanblog.com/
Sign up for (occasional) emails: eepurl.com/YdjL9
A NOTE ON THIS VIDEO:
A few of our Tadashi videos blur the already blurry line between mathematics and physics... Some people suggest they may be a better fit on Brady's dedicated physics channel (called Sixty Symbols).
In response, the reasons they are on Numberphile are:
1) Tadashi, while certainly a modern polymath, is based in a mathematics department.
2) This sub series (with its animation and extra production work) has been supported by the Mathematical Sciences Research Institute, a Numberphile collaborator.
3) Some of the previous and future Tadashi videos are more math-oriented than physics - and it just makes sense to put them on one channel rather than dividing the series between two channels on an ad hoc basis.
In a multi-disciplinary world, it is challenging to run KZfaq channels which people come to associate with just one discipline.
That said, feel free to go over and watch hundreds of physics videos on Sixty Symbols --- / sixtysymbols

Пікірлер: 536

@Ferraco05 6 жыл бұрын

The spoon effect was such a marvelous example to follow the professor's explanations. At first, I was somewhat skeptic about the action-reaction argument, but this example really did give me a more intuitive understanding of the underlying principles that were being discussed. Also, comparing pressure to potential energy was a nice touch. All in all, I like the clarity with which the professor speaks and explains things in this video.

@PCanas 6 жыл бұрын

I'm a simple guy: I see a Tadashi video, I stop what I'm doing, and watch it.

@user-iu1xg6jv6e 6 жыл бұрын

What if you were watching another Tadashi video?

@PCanas 6 жыл бұрын

That means I would be watching it for, at least, the second time. So, I'd stop that one, watch this, and then go back to the other again. ;)

@outsidethepyramid 4 жыл бұрын

@PCanas Amazing how these copy and paste comment surface to the top. A vid should be done on that. Who's watching this in x (x=year)

@Triantalex 7 ай бұрын

false.

@MisterAppleEsq 6 жыл бұрын

Revenge of the Air, coming to a cinema near you.

@NastyMick 6 жыл бұрын

Written by M. Night Shymalan.

@lucromel 6 жыл бұрын

The Ball Strikes Back

@Arnaz87 6 жыл бұрын

Honestly this doesn't sound like a movie I would enjoy. Just like The Last Airbender

@lebumbcrack7248 6 жыл бұрын

12 minute Tadashi video?! Yes please!!

@AssailantLF 6 жыл бұрын

We need Tadashiphile

6 жыл бұрын

Felt like 2 minutes, time flies when Tadashi is explaining flight XP

@allkinds1069 6 жыл бұрын

I literally only watched this because of tadashi 😂 his voice is so relaxing

@andregon4366 6 жыл бұрын

I only watched because I was hoping to see Tadashi's feet, but instead I saw Tadashi wasting water :/

@outsidethepyramid 4 жыл бұрын

He can't pronounce English words correctly. LOL

@outsidethepyramid 4 жыл бұрын

@@uku4171 LOL

@Triantalex 7 ай бұрын

@Maladictus 6 жыл бұрын

Tadashi's Toys - the best series on Numberphile!

@00bean00 6 жыл бұрын

For UU

@bwayagnes2452 4 жыл бұрын

True

@softgender 6 жыл бұрын

This was a very interesting way of looking at fluid flow without being overly reliant on Bernoulli's principle which has always irked me as it's always seemed to be used as a crutch. I remember playing with household items, like the spoon with the tap water, and always wondering why things like that happened. Also, can I just say Brady and Tadashi are looking great today! More love to knowledge enthusiasts of all kinds.

@Graknorke 6 жыл бұрын

Yeah I agree with the crutch thing. Especially since, as Dr Tadashi said, it's not even really accurate. I feel like it's almost an obligation to describe it that way even though Newton's third law is a simpler explanation for wings etc.

@J-Eagan 6 жыл бұрын

In thermodynamics we learned that Bernoulli’s equation was basically a specific case of enthalpy, so there’s more than one way to look at the problems for sure.

@K1lostream 6 жыл бұрын

Tadashi is looking great....but Brady's piling on the pounds! As Blur once said; cut down on the pork pies, mate, get some exercise!

@Kiteboardshaper 6 жыл бұрын

Bernoulli's principle doesn't explain AOA, stall or the bottom side lift of a wing. This is the best way I've seen anyone cover lift principles yet.

@rewrose2838 5 жыл бұрын

You mean math enthusiasts of both kinds? ( applied and theoretical)

@pirana6 6 жыл бұрын

I'll be honest, I'm not quite smart enough for a lot of the Numberphile vids, but either Tadashi picks a slightly easier topic or he's just good at explaining it because I can follow them so much better.

@zackbuildit88 2 жыл бұрын

I think it’s kind of both, or at least he picks more beginner level topics instead of topics that need more preexisting knowledge

@pedroscoponi4905 6 жыл бұрын

The spoon slow-motion was worth the time, by the way Tadashi, as always, never fails to deliver with these videos :D

@BKITU 6 жыл бұрын

Tadashi-sensei for Emperor of Earth, please.

@asteiner274 6 жыл бұрын

I would be okay with that.

@PureZOOKS 6 жыл бұрын

Tadashi Hakase* Man's earned his title.

@bigbird772 6 жыл бұрын

BKITU no emporers. Only love. Democracy liberties and rights to all!

@bigbird772 6 жыл бұрын

BKITU if only we could get more scientists n2 politics.. law makers have no idea how to science and neither does the preponderance of the civilian population

@woowooNeedsFaith 6 жыл бұрын

You mean TADAA-shi-sensei?

@charlescollins9587 4 жыл бұрын

Professor Tadashi is a very strong teacher. He's both extremely descriptive and clear at the same time. Fantastic video.

@ThePrimevalVoid 6 жыл бұрын

Physics invades Numberphile yet again.

@numberphile 6 жыл бұрын

See my discussion in the video description

@TheofanisIII 6 жыл бұрын

Tadashi is now Derk

@samchan5251 6 жыл бұрын

Physics? That's applied maths.

@johancouder8013 6 жыл бұрын

No, math is just the language of physics.

@MyYTwatcher 6 жыл бұрын

@SAm Cham You are wrong. What is important, is the physics. Mathematics is just the language to describe the physics.

@ckannan90 2 жыл бұрын

I like how he was delighted by Brady’s use of Tadashi-like language

@masheroz 6 жыл бұрын

It's past my bedtime, but Tadashi!

@numberphile 6 жыл бұрын

Just a quick look...

@DajJednego 6 жыл бұрын

You should have used "Tadashi" instead of "but", that sentence would have been so meta! ;)

@MyOwnUrl 5 жыл бұрын

Same

@HunterJE 7 ай бұрын

The spoon effect is one of many I discovered as a small child shortly before being yelled at to stop wasting water XD

@dominicockersz9523 3 жыл бұрын

The simplicity of his explanations are magnificent. 🤘

@ravneetsingh1499 6 жыл бұрын

I haven't seen any better video on KZfaq in 2018 than this....just awesome

@numberphile 6 жыл бұрын

wow, cheers! :)

@ravneetsingh1499 6 жыл бұрын

P2M I mean educational

@RodeyMcG 6 жыл бұрын

Prof Tadashi is a phenomenal teacher, the language he uses makes the most complex subjects become clear as day! Thanks for another great video!

@OlafDoschke 6 жыл бұрын

It's nice when questions lead to extra experiments.

@b1aflatoxin 6 жыл бұрын

Nice! I love it when great teachers explain concepts in a way that just "clicks" with me! Thanks guys!

@thomasjoyce7910 6 жыл бұрын

I'm a complicated man. I see a new Tadashi video, I click Like, then I add it to Watch Later, then I write this in the comments, then some time later, when I feel I've earned a treat, I watch it. I am aware that nobody asked...

@potatoes8169 6 жыл бұрын

did you watch it yet?

@DeathBringer769 5 жыл бұрын

Commenting before watching the video... just a bad habit in general, even if you happen to just make a harmless comment this time around, lol ;)

@michaelteret4763 6 жыл бұрын

Wonderful. To be able to see phenomena with Tadashi’s deep understanding must be a beautiful gift.

@nymalous3428 6 жыл бұрын

I love how Tadashi always makes math and physics so accessible for anyone to experiment with just by using simple or everyday objects. Great video!

@iMarc89 6 жыл бұрын

Tadashi is my favourite Numberphile contributor. I could listen to him talk about anything.

@MikeAben 6 жыл бұрын

Thank you! I've been using exactly this explanation to explain how a sail works, against conventional wisdom and people telling me I'm wrong.

@twwc960 6 жыл бұрын

You're partly right. Sails do give forward propulsion by changing the direction of a stream of air. This explains why a sailboat can't sail directly into a headwind, but it can sail forward if the wind is approaching from the front at an angle. It does so by redirecting the air to leave the sail in a "more rearward" direction that it approached the sail. But in a sail, the change in direction is mainly due to the air being turned by the concave side of the sail (kind of like an ice cream scoop) whereas in the floating ball demo, the spoon demo, and an airplane wing, the fluid is deflected as a result of the streamlines "adhering" to a convex surface (the Coandă effect).

@MikeAben 6 жыл бұрын

twwc960 I'd say there's some of both happening, though admittedly likely more from the "ice cream" scoop effect. It is very common to have tell-tales (strips of ribbon or yarn) attached to the surface of sails to indicate air flow. You want smooth airflow on both sides of the sail. This suggests the far side of the sail is doing some work too.

@twwc960 6 жыл бұрын

I suspect you're right. It's probably due to both effects. I hadn't thought about it too deeply before.

@00bean00 6 жыл бұрын

lol, if you think an airplane wing gets most of its lift from a parlor trick rather than ram angle

@ilikemitchhedberg 6 жыл бұрын

Love this professor. Paying close attention to detail regarding physical phenomena is the foundation.

@ckannan90 2 жыл бұрын

This is the first time I’ve ever been convinced by the explanation for why a wing produces lift

@attilamorvai 6 жыл бұрын

I just love how respectfully he talks to him, by saying "professor,...."

@JorgetePanete 6 жыл бұрын

Attila Morvai because he is japanese

@GarageWoodworks 6 жыл бұрын

It's not uncommon at a University when speaking to someone who holds the title of 'Professor'.

@TheAlfieobanz 6 жыл бұрын

Tadashi is my absolute favorite

@shadrack1701 6 жыл бұрын

More Tadashi! He always makes for the best videos.

@kimschroder9354 6 жыл бұрын

Infinitely many mathematicians walk into a bar. The first orders one beer, the second one two, the third three and so on. After some time, the bar man is fed up, and says: Just give me the 1/12 beer already!

@fergusmaclachlan1404 6 жыл бұрын

-1/12

@kimschroder9354 6 жыл бұрын

Fergus Maclachlan yeah but if they are ordering beer, then minus one beer would mean giving one beer to the bar man. So that's why the bartender gets 1/12 of a beer...

@fergusmaclachlan1404 6 жыл бұрын

Ah yes, that makes sense.

@00bean00 6 жыл бұрын

That's why he says "give"

@fergusmaclachlan1404 6 жыл бұрын

I know, I misread it.

@ais4185 6 жыл бұрын

Actually marvelous! I just love Mr. Tadashi's way of explainin maths/physics/toys.

@sergiopcr 6 жыл бұрын

What a great video! The phenomenon is very well explained! Cheers to both intervinientes.

@xaelee 6 жыл бұрын

love Tadashi. keep up the great work guys.

@88morningstar 6 жыл бұрын

Tadashi, your videos are continually amazing. You must be an amazing classroom professor. How do you sleep at night with all of these awesome ideas in your head?! Thanks for sharing them with us.

@Kiteboardshaper 6 жыл бұрын

OMG - finally a decent explanation of flow over lifting bodies - one that actually can take into effect angle of attack.

@zubmit700 6 жыл бұрын

Damn, I love this dude.

@FizzyK-45 6 жыл бұрын

Yay, more video with Tadashi! :D

@Toobula 6 жыл бұрын

Excellent, Professor, as always.

@geetarwanabe 6 жыл бұрын

The 'coherence is called the Coanda effect and it is most certainly the reaction of that deflected airflow that produces most of the lift of an aircraft. The resultant pressure gradient can be optimised to reduce drag. If the pressure gradient gets too large and exceeds the coherence to the solid then the flow separates and turbulence boundary layers form.

@TheJaseku 6 жыл бұрын

Thank you for putting the amazon link in the description :)

@cubethesquid3919 6 жыл бұрын

I've done that spoon trick before! I loved it!

@realcygnus 6 жыл бұрын

Tadashi is the Best !

@Parapoint13 6 жыл бұрын

I'm jealous of whoever gets to have this guy as their professor, that was really well explained!

@timisa58 4 жыл бұрын

Love this one! So many of our Physics textbooks and teachers and curricula continue to apply Bernoulli to flight. Ugh.

@ShipOfFreaks 6 жыл бұрын

Astonished to realize that pressure is the same thing as energy per volume. Awe inspiring insight.

@AlyoshaK 6 жыл бұрын

なるほど　　They used to sell this toy in the toy isle of the grocery store when I was a little boy. Thanks for bringing back the great memory!

@whatelseison8970 6 жыл бұрын

I like the spoon demo better for this explanation because you can also show that what happens on either sides of the spoon would be working in concert in a homogeneous fluid except that you can show the two effects separately. Turn the spoon over and deflect the stream the other way and you can also feel the force in the other direction. You can also pull a spoon lengthwise through a pool of water and see and feel both at once.

@scienceandmusicmix 6 жыл бұрын

Pressure is energy per volume....wow I can't believe I never thought of it like that! Love this guy

@zoobie2000 6 жыл бұрын

Great video thanks for posting

@Brookskyar 6 жыл бұрын

Thank you so much for the explanation. I'm an aerospace undergrad and they've nvr taught me this version of how lift was generated yet.

@alekzamonski1179 6 жыл бұрын

Some awesome physics there!! Love this guy

@mcsoloo 6 жыл бұрын

love you Tadashi!

@ThomasMaltuin 6 жыл бұрын

Kudos to whoever does your demonstrations. The equilibrium between dots in that particle bond/attraction cut scene was a nice touch. Did that take some coding?

@ThomasMaltuin 6 жыл бұрын

Gregory Chamberlain I am very familiar with 3blue1brown, who also does a fine job. His essence of linear algebra series is incredibly insightful.

@ExhaustedElox 6 жыл бұрын

Tadashi-sensei does it again. I used to do that spoon experiment all the time when I had to do the dishes as part of my chores.

@Kualinar 5 жыл бұрын

I remember a toy that I had in the 60's. It was a base with a fan that you can orient in a wide arc and you can also control it's power. Next, you had those balloons with an attached landing base. I was able to land it, and take off, a few meters away. I managed to land it on a chair under the diner table. My brothers and I had a lot of fun with it.

@TulioSounds 6 жыл бұрын

Amazing. I love Tadashi

@ricardoabh3242 6 жыл бұрын

The wing in a plane as a slight angle in relation to the movement of the plane, that’s the push up effect. The second force, the pull, is given by the shape of the wing.

@danielribastandeitnik9550 6 жыл бұрын

LOVE Tadashi videos! So, I think in the Halliday/Resnick volume 2 (or 1?) book they explain that the air above is faster because it's flowing in the same direction as the surface of the ball is rotating and the air below it is slower because it's flowing against the direction that the surface of the ball is rotating. So a difference in pressure is created and we have lift!

@daniellambert6207 6 жыл бұрын

Excellent music for the slow motion shots

@prolleytroblems 6 жыл бұрын

What a fantastic video. What fun!

@aleattorium 6 жыл бұрын

What an awesome video.

@sciencetoymaker 5 жыл бұрын

Very well done--thumbs up!

@skebess 6 жыл бұрын

This is just beautiful.

@toonfalco 6 жыл бұрын

Great video! Reminds me of what was great about intro mechanics

@viliamklein 6 жыл бұрын

Professor Tadashi's diction is amazing.

@blackrasputin3356 6 жыл бұрын

I've actually studied the Bernoulli effect in my math and physics classes, and this is by far the best explanation I've seen.

@tabaks 6 жыл бұрын

Excellent video!

@camilofebres8417 6 жыл бұрын

More Tadashi, please!

@victor3582 6 жыл бұрын

That potential energy relating to pressure would have saved me so many hours when firstly trying to understand fluid mechanics. I had so much trouble with it lol

@Cellkist 6 жыл бұрын

Tadashi could blow a mean breathalyzer

@Kwizii 6 жыл бұрын

How about a nice one most of the days but aggressive if you steal its coffee?

@rewrose2838 5 жыл бұрын

@@Kwizii *his ?

@duncancoe 6 жыл бұрын

Tadashi is the best part of this channel

@greath7513 6 жыл бұрын

It would be super awesome to see the ball experiment in front of a Schlieren apparatus (that lets you see airflow)!

@alvincay100 6 жыл бұрын

What I find most fascinating is that it appears to be a stable state solution. I would never have guessed that there was such a solution. I would've assumed it would fall to the floor and that the air would push the ball away as well as giving it lift.

@JaxsonGalaxy 6 жыл бұрын

Now I have an explanation for how I've water-bended shower streams along my arms an elbows to get hairs off from the shower wall. Thanks Brady!

@K1lostream 6 жыл бұрын

Yay! new tadashi video!!

@7177YT 4 жыл бұрын

made my day! thank you!

@nab-rk4ob 6 жыл бұрын

I love his videos!

@ZeedijkMike 6 жыл бұрын

Great demonstration. Would a bit of smoke show the air flow? Watched a whole lecture with this guy the other evening.

@Hankathan 2 жыл бұрын

This would be a great toy for aspiring musicians. You need a strong and constant air stream for wind instruments.

@stevefrandsen 6 жыл бұрын

Fun video. Thanks!

@ylenolsreppeptgs 6 жыл бұрын

love this guy

@Algebrodadio 6 жыл бұрын

He's a great explainer of things.

@94kenDOLL 6 жыл бұрын

love tadashi videos!

@Dario01101 6 жыл бұрын

Tadashi simply the best

@Incognit05 6 жыл бұрын

this video was so short and elegant

6 жыл бұрын

Oh! I had noticed the effect with the spoon while doing the dishes but I never thought of it this way!!

@Adam-iy2ko 6 жыл бұрын

Tadashi is utterly legendary

@Trollllium 6 жыл бұрын

I think a Schlieren Imaging video of the air around the ball would be very cool and explanatory. Numberphile should do it either by itself or with another channel!

@aiciy44 6 жыл бұрын

Yess finally someone who says the truth! You can't use Bernoulli theorem in this case! Awesome video

@benjaminparker5044 6 жыл бұрын

shiro I'm not rejecting this application, or saying that you can use Bernoulli in this scenario, but he didn't really explain WHY you can't use Bernoulli and I want to understand that part

@aiciy44 6 жыл бұрын

you can't apply Bernoulli because there are two different stream lines(one at the top and one at the bottom of the ball), and the theorem could be applied only along a single stream line.

@benjaminparker5044 6 жыл бұрын

shiro but both streamlines are acting on the same object. So does that actually mean the Bernoulli principal does not apply to the wings of an airplane

@aiciy44 6 жыл бұрын

Yes you can apply the theorem along the two different streamlines but Bernoulli doesn't explain everything. In fact you're assuming that the air at the top of the wing(or the ball) is faster than the air at the bottom, but why can you say that? In addition, with this explanation, airplanes could not fly upside down (maybe during an exhibition), in fact the resulting force (due to the shape of the wing) would make the airplane fall down instantly. So you can use Bernoulli to justify some aspects of this phenomenon but it's not 100% correct

@leonardokim 6 жыл бұрын

Planes can fly upside down because they change the angle of attack.

@AstAMoore 6 жыл бұрын

I used to do this with a vacuum cleaner and a ping-pong ball when I was little. (Old vacuum cleaners used to have an exhaust port you could attach the hose to.) Tons of fun.

@visog 6 жыл бұрын

Tadashi's maths is so cool as it's applied...

@felinfoel1156 6 жыл бұрын

I am convinced that Tadashi is a wizard. He veils his beguiling tricks with explanations of "Maths" and "Physics", when the real effect of his spells are to make me halt what I'm doing and watch the full video absolutely bewitched.

@Deltadigit 6 жыл бұрын

Had seen this effect in local eateries when cooks used to place lemon over the pressure cooker's pressure release valve. Was always intrigued with this effect.