As a carpenter for over fifty years I've recognized this behavior with flipping of a hammer because I early on decided to teach myself to juggle hammers. I tried to prevent the twist-flip with absolutely no success. It became clear there was more stability in working with the flip instead of against it. This explanation is such a relief! I thought it was a personal curse. Now I realize hammers are the perfect object to demonstrate this motion because they, unlike tennis rackets, have no symmetry about any axis!

@johnpossum556

3 жыл бұрын

You just got defective hammers.🤣

@joedaly6887

3 жыл бұрын

@@johnpossum556 additional evidence: rip claw configuration in hammers produce more consistent axial twisting.

@pmcgee003

3 жыл бұрын

Once again ball pein better than claw hammer. 😀 😉

@alsteiner7602

3 жыл бұрын

@@joedaly6887 that has been my experience flipping a straight claw for years--it never rotated about the intermediate axis. Very east to flip

@jamespppyacek342

3 жыл бұрын

Yeah. Same here. Carpenter. Hammer. Flipping.

"Babe, come over, im home alone" "No, babe, Im solvin a centuries old math problem."

@ragnarok7976

3 жыл бұрын

The problem: Where does she want to go for dinner.

@illogicalparadox

3 жыл бұрын

What a chad, keheheh.

@davidh1206

3 жыл бұрын

You’re dating the wrong person if this isn’t an acceptable alternative to dinner

@TheNebulon

2 жыл бұрын

He bumps her on the secondary axis to get her to turn around

@NickRanger

2 жыл бұрын

@@TheNebulon it's the 3rd axis we all want

I got in trouble at work today because I was tossing various objects and watching the flip. I tried to explain it to the boss but he wasn't having it. He fired me. Now I have more time to watch your videos!

@HyperVectra

11 ай бұрын

You must not have explained it well. Sometimes people need to experience it themselves to truly understand the concept. If you cut his brake lines, his car should spin around the maximum angle of inertia.

@HyperVectra

10 ай бұрын

@@nramrez Oh.. could you tell me then please?

@thedevilinthecircuit1414

6 ай бұрын

Time to convert some of that inertia to getting a job 🙂

@SvenSamray

4 күн бұрын

Happens when you tossing dead bodies around like a mad man.

A colleague pointed me to this great video! I was fascinated to find that it also contained two additional facts about the great condensed matter physicists of the past century. 1) If you claim that any physical concept is not in the Landau-Lifshitz books, most probably you have not looked for it as carefully as you should. 2) It is really tough to beat Feynman's physical intuition on anything, even if he thought about it for less than half a minute.

@KiltedWeirdo

4 ай бұрын

wow. the circle from the plane has collatz 3x+1 effect (its 4 squares is missing its internal circle). the tenis racket is a offset of mass in /2 settings. nice! I wonder. does this apply in quantum and subatomic environments?

I was a dynamicist in the aerospace industry for 43 years, and THAT is the BEST plain text explanation of this behavior I have ever seen! Fantastic!

@gregsmith1719

3 жыл бұрын

Wow! You have sold me! I'll watch it again!

@xccghvbno1063

3 жыл бұрын

Then you're probably the person to ask what are the odds that the plates shifting around could in fact change the Earth's moment of inertia to where it could possibly effect the crust in a dramatic way? Just curious not every day one has a chance to ask a question to an expert who's possibly even thought about the same But actually with the educational background to get through the weeds of the problem and Come up with a Realistic hypothesis even if it is just A rough mental outline

@danielhope2924

3 жыл бұрын

Was I watching this correctly to assume that if the frozen poles had enough elevated weight and then melted lowering that weights and even some of the water dissipating towards the equator, this could shift the moment of inertia ?

@xccghvbno1063

3 жыл бұрын

@@danielhope2924 very good point. Time For me to go research exactly how much ice is estimated to be Frozen.Thanks for the input

@3.k

3 жыл бұрын

@@danielhope2924 The poles are where the least mass is, on the spinning axis. So if their mass would be distributet all over spinning system, the spin should become even more stable, because the mass around the equator would become even more significant.

*Russian Cosmonaut spins a wingnut in space:* _"TELL NO ONE OF THIS!"_

@rdreese84

4 жыл бұрын

That's how the Russians do.

@axiolot5857

4 жыл бұрын

@@rdreese84 Aaaah those russians

@silverhawkroman

4 жыл бұрын

i seriously thought he was gonna use it somehow as a kinetic superweapon, but the earth turning upside down? You really think the US is gonna crap their pants if you can manage to turn the earth around? That's ridiculous

@clipsedrag13

4 жыл бұрын

@@silverhawkroman oh no!!! Everything is exactly the same!

@NicoKupfer

4 жыл бұрын

@@silverhawkroman Komrad Androvsky, vee kannot tell ze Hamerikans!

I have a feeling that when Feynman replied "No" to the question, it was because he considered even this "intuitive" explanation, not that intuitive for most non-physicists/engineers.

@jaydenwilson9522

7 ай бұрын

what question?? im curious and havent read much feynman

@conormurphy341

7 ай бұрын

@@jaydenwilson95225:51

@yommish

7 ай бұрын

@@jaydenwilson9522 it’s in the video

@jaydenwilson9522

7 ай бұрын

Its own Axis disrupts its harmonious dance... Which temporarily causes imbalance, but even then... It still seeks to return to a balanced state. And it always will return to that state... No matter how dysfunctional. - Jayden Wilsons "intuitive" explanation of the intermediate axis theorem.... guess I'm smarter? @@yommish

@yommish

7 ай бұрын

@@jaydenwilson9522 wow, I guess you are smarter than Feynman

I love how you manage to pack so much into one video, physics, history, personal interest stories, tangents to pursue further ... this is how I would like to teach and I know how hard it is to do

I've been flipping tennis rackets for years and never been able to get my head around this effect. Incredible.

@fxm5715

4 жыл бұрын

I always figured I was just giving it some spin around the long axis unintentionally, because I didn't have enough dexterity to do otherwise. Now I know better.

@naverilllang

4 жыл бұрын

I always assumed it had to due with imbalanced rotation compounded by air resistance. Which I guess was half right.

@timbeaton5045

4 жыл бұрын

Was this a Head, tennis racquet by any chance? 😎

@po_thiago

4 жыл бұрын

I've also been flipping tennis rackets for years, but never been able to get my head away from its path on its way down... ;(

@larryrich327

4 жыл бұрын

David King I always thought it was my skill that caused the flip I didn't know it was doing it on its own 😕

This explaination is beautiful when you're actually learning this stuff in school... keeps me wanting to know more. Thanks Veritasium!!!

@Tattootin

3 жыл бұрын

Never been a more deserving like to a comment on a video!

@llll-lk2mm

3 жыл бұрын

@@Tattootin :)

@mapk4655

3 жыл бұрын

I watch this as a break from stupid school work.

@jamessmith2622

3 жыл бұрын

@@llll-lk2mm %ï

@RitaMaru11

3 жыл бұрын

@@mapk4655 Good

No Earth flip. We good.

How beautiful you explained one of the most counterintiuitive physics problems in an intuitive way.

This is the content I subscribed for. Well done!

@winkil1

4 жыл бұрын

Agreed

7:45 - "Normally I don't like talking about centrifugal forces." Honestly, neither do I.

@frostyjhammer

4 жыл бұрын

Always heard that word pronounced "cenTRIFugal" but he's got it "centriFUgal" =`8^o

@scottmccollum9979

4 жыл бұрын

It's just too rich a subject...

@karirytkonen5811

4 жыл бұрын

Is there need in this case either? Can't it be explained by inertia as always? Mass tend to continue on it's path and that is why it ends up on wider circular route.

@scottmccollum9979

4 жыл бұрын

@@karirytkonen5811 I would have to concur...

@jerrodbates8480

4 жыл бұрын

.....they're the WORST!

Noticed this effect when idly flipping a hammer as a construction worker in the latter 1970s. Always wondered what the cause was, as with some practice I could flip the hammer so that it didn’t flip. Was never sure if it flipped because I imparted a spin. When I went to college in the 1980s and got an engineering degree, I don’t recall that this theorem ever came up in physics, math, or engineering classes. Thanks for the explanation!

Thank you! This is an amazing explanation and I can finally see in my head how it works. I've never been able to follow the maths involved.

"The goal of this video is to prove Feynman wrong." You have high ambitions, young man!

@caparroz1923

4 жыл бұрын

As soon as I heard him say that I came to see this comment. Was not disappointed. High ambitions, indeed.

@raykent3211

4 жыл бұрын

Very brave! Feynmann: so you're saying that loss of kinetic energy causes a change in rotational axis to that of maximum moment of inertia, when usually it just slows things down? Since when was inertia intuitive? My ref to surely you're joking.... great video, though.

@rubiks6

4 жыл бұрын

I think he was quite successful. Raspberries to Feynman.

@DobromirManchev

4 жыл бұрын

@@raykent3211 Indeed, it all depends on what you call "intuitive". I think inertia is a step higher than what most people will find intuitive.

@rogerwhittle2078

4 жыл бұрын

My first reaction was that it is quite rude to make such an attempt, if not actually heretical - Feynman being such a towering icon of scientific thinking. Then I thought 'Nah, Feynman would love it.' I was fairly comfortable with understanding this phenomenon, but I suddenly had a very nasty moment when the subject of the Earth doing the same was raised. It being a fluid filled object and everything - magnetic poles flipping as evidence. I'm glad he could assure us it would not. So, did he prove Feynman wrong? Because my brain still hurts.

So the next time someone calls me "a flipping wingnut" I'll know why.

@energy_waves

4 жыл бұрын

Gemini

@mryu1995

4 жыл бұрын

Pff you are such a wingnut

@billdecat855

4 жыл бұрын

@@mryu1995 lmao, well played

@Bibibosh

4 жыл бұрын

Bill DeCat why?

@Bibibosh

4 жыл бұрын

Why is a wing nut an insult? I’

I had always wondered why a tennis racket could never flip straight, finally get an explanation! Thank you lol

Quite simply one of the best, most fascinating videos I've ever seen. As a tennis player, it's always fascinated me how the racket appears stable when flipped in from a vertical starting position, yet twists in the air when flipped from a horizontal starting position. I've never found any explanation (though to be fair I've not looked), but happened across this from an answer on Quora. Watch the whole video - the implications discussed at the end are quite literally out of this world. Excellent, 10*

As a kid, I would frequently watch my dad flipping the TV remote control in his hand and studying the inevitable half-turn in its flight pattern. He concluded that his wrist was subtly imparting spin. If he were alive today, his mind would probably be blown watching this video.

@llll-lk2mm

2 жыл бұрын

aww that's so cool

@dziltener

Жыл бұрын

"He concluded that his wrist was subtly imparting spin." Well, as we've learned in your video, your dad was right

@roasty247

Жыл бұрын

Cannot tell you how many hours I have done this with a TV remote too, trying to get a straight flip. Futile all along.

@siggyretburns7523

Жыл бұрын

This physics trick puzzled me years ago when I was flipping a claw hammer. No matter what I did or how I flipped it it would not just flip with the claw on the right and the hammerhead on the left. It would end up that way but half way through the flip, the claw and hammer would switch sides. From what I understood of physics at the time, I assumed it was because either the claw or the hammer weighed more than the other and gravity interrupted the momentum. But this video proves me wrong. One thing I dont understand is that if its perfectly balanced, it shouldn't happen. I still think that Earths rotation has something to do with it.

@dziltener

Жыл бұрын

@@siggyretburns7523 Yes that is correct, if it were perfectly balanced, it would not happen. But there is no such thing as "perfect" in practice.

I always assumed this happened because I was adding spin without realizing it. The theory of a rotating object trying to minimize its kinetic energy actually makes a lot of sense.

@lukeernst2101

Жыл бұрын

I mean, you are adding spin without realizing it. In the point mass simulation even the intermediate axis is stable until there was a tiny deviation from exactly straight spinning. Whether it’s you unknowingly rotating it along an axis slightly different than the true intermediate axis, or air later misaligning it, it’s almost impossible to not see this effect in practice

@ayooshiyer8621

Жыл бұрын

@@lukeernst2101 if air is causing this misalignment why do we still see this effect in space ?

@singh2702

Жыл бұрын

@@ayooshiyer8621 If the intermediate axis is pulled into a spin by the larger axis then this intermediate spin can only end once the larger axis has spun itself 180 degrees. By this deduction alone the outer intermediate masses must be switched hence the flip.

@hellencitaUwU

Жыл бұрын

@@ayooshiyer8621 cause there is air on that cabin, remember that they are still breathing... i think if they left it in space without air we cant see this phenomenon.

@rarebeeph1783

Жыл бұрын

@@hellencitaUwU the air has nothing to do with it. as derek (veritasium) said, in the reference frame of the initial rotation of the disk, the centrifugal force inherent to the rotation is what causes the disk to flip, with a frequency dependent on how much deviation the smaller masses are initially given from the axis of rotation. that's why the wingnut spins for so long between each flip, while most other things flip much sooner: the wingnut was given very nearly axis aligned rotation when it was spun off of its screw, so the centrifugal turning forces are very small for a rather long time.

It becomes more difficult to travel further in any one axis. Accelerating in one direction of rotation meets this criteria. The wingnut flips because the continuing rotation acts like an acceleration yet with an easy way to change axes from 0 g. The limit as a rational value goes to infinity becomes irrational in the same axis, every time. Nice video!

New sub, thanks for the content. I found your video interesting, informative and entertaining. I experienced this many years ago when I was a carpenter stacking roofs. Showing off I would spin my rigging axe and catch it, it looks dangerous and quite impressive especially with the twist. In reality it is quite stable and predictable.

I'm a carpenter and I'm constantly flipping my hammer while I'm not busy. I've wondered for the past 10 years (I became a carpenter in 2010) why is it the head and claws of my hammer flip flop when I flip my hammer head over handle. I thank you for this video!! I suffer from ADD/ADHD and I find myself pondering this very often (driving myself nuts over it). Thanks again for the answers!!!!

@albertoserrano4736

4 жыл бұрын

anxious minds made modern world possible

@Lugnut64052

4 жыл бұрын

First thing that occurred to me too. Been a carpenter for many years. Hammers will do that every time you flip them.

@pseudogamer4559

4 жыл бұрын

Yeah.....I understand ur struggle for all this year's I mean u could have done nothing about it..... If someone from MIT got this idea he would have derived it in few days because of their technology and advancements in maths n physics ..... I've gone through the same thing many times .....it takes time to solve problems .....unless i meet some expert on that topic and gain complete idea .....then i can solve it xd

@carlosbyrd4519

4 жыл бұрын

@Alexandre BrunetI hope so

@squarerootof2

4 жыл бұрын

@Compliment Thief Stop thieving.

This experiment is represented in a humorous way in Kerbal Space Program. When in mid air or a vacuum, while EVA, you can perform an experiment where the Kerbal tries to spin a wingnut, but he spins instead. It's not exactly the same thing, but it's really cool to finally learn from where they drew the inspiration for that animation.

@philiphockenbury6563

2 жыл бұрын

Another KSP fan.

@dimanyak373

2 жыл бұрын

"The strangest thing is not that it happens, but that spacecraft works without this part"

@ChrisMcNeely

2 жыл бұрын

lol that's awesome

@maxcorrice9499

2 жыл бұрын

Did that change? When I played it did this, maybe it’s based on specialty

That was interesting and really intuitively explained. Thanks!

Well done, first time I have seen someone go through the trouble of showing a rotating frame of reference. How a rotating body sees the world around it and the centrifugal forces it experience.

Video: contains the phrase "prove Feynman wrong" Also video: doesn't use this phrase as clickbait. I salute you.

@shadowcoder19

4 жыл бұрын

One could still argue that it is clickbait. Because an intuitive explanation is relative to the person receiving the explanation. And Feynman probably knew his students wouldn't be able to understand this explanation. Hence it being hard for him to intuitively explain it to his students.

@funkyflames7430

4 жыл бұрын

Living Legend I concur. Derek in this case used 3d animation to explain this phenomenon while Feynman would’ve been limited to making some drawings and mental pictures. The explanation subjectively intuitive but intuitive nonetheless, at least more so than math equations.

@TheLaXandro

4 жыл бұрын

He could make a "3d model" out of a plate and a pencil to mark the axis out, and demonstrate it in a largely similar way.

@vsiegel

4 жыл бұрын

"prove Feynman wrong" is not working clickbait - it's so obviously spam that nobody would click it. And then... he actually did what?

@mvmlego1212

4 жыл бұрын

Of course, it's not "bait" if he actually does it (which, in my opinion, he did). I still appreciate that he gave it an informative and non-confrontational title, though.

There is also a skateboard trick called the impossible flip because of this. They counter it by leading the front foot trough the flip to keep it from flipping on the other axis.

@commie281

4 жыл бұрын

yeah thats exactly what i was thinking and i was like-wait are they defying this theory?

@tooba6290

4 жыл бұрын

I saw the physics girl video about that.. but I understood that here..

@Horforia

4 жыл бұрын

kzread.info/dash/bejne/q3qGssqiYM3Od8Y.html

@FerousFolly

4 жыл бұрын

this effect is also what makes the 360 flip (tre flip) work the way it does.

@jonbowman7686

4 жыл бұрын

yes! this took forever to learn. btw using the front foot to balance the board is a "front foot impossible." An impossible uses the back foot.

Oh my you already got a list you are working on thanks for sharing your knowledge and a bit of fun

So this is what happens whenever I flip the remote and it does a half spin

@justArandomfellar

Жыл бұрын

Yeah 😆

This phenomenon fascinated me as a 10 year old since I’ve been obsessed with skateboarding, (specifically flip tricks); and although I could not explain it, it was what first got me interested in physics.

@bradleyries2817

2 жыл бұрын

Interesting point! Kickflips and shuv-its are common tricks, yet the impossible is well....harder to do!

@megashock1319

Жыл бұрын

@@bradleyries2817 the impossible is my favorite trick and i think tony hawk did a video about this physics property

@SoroushTorkian

Жыл бұрын

I’m kind of surprised there aren’t more pro skaters who like physics, it makes logical sense haha

I've never been so educated, filled with a learned horror and then so suddenly and gratefully relieved in a single video. You deserve an award for creating the most educational drama in human history.

@patrickmcleod111

4 жыл бұрын

Well, at least we now know that the Earth has 3 potential axis spin directions........... you know, because it's flat....... Darn, why couldn't God have made the Earth round!!?? Lol 😂

@andyclark4627

4 жыл бұрын

Wont it have infinite axe's of rotation due to it being a ball??? (Not taking the piss or being sarcastic or trying to sound clever)

@SmashToBits

4 жыл бұрын

@@andyclark4627 it is sphere-ish. But it is heavier in areas like the gravity image of Mars he showed

@decidiousrex

4 жыл бұрын

Watch his other videos. He has some seriously cool plot twists involving nothing but science

@bobrolander4344

4 жыл бұрын

Isn't this just a special case of the butterfly effect?

Watching a mathematician do something physical and coordinated is almost as interesting as the great info provided.

@ernestolula3280

Ай бұрын

Grotesco... ¿Teatro?

that was intense ! it's been more than a year probably when I watched the video by the first time and I did not understand much. I'm glad that today I understand more. Thank yo so much for what you do. You are awesome !

I noticed this years ago flipping a hammer in the air. Each time the head points a different direction. It's cool to have it explained.

@michaelm.6043

2 жыл бұрын

Me too !!!

@musicbruv

2 жыл бұрын

And me, used to think it was the way I flipped it.

@grimresolve2606

2 жыл бұрын

Same, but with a pair of scissors (not recommended).

@williamrbuchanan4153

2 жыл бұрын

Think it’s about a wing nut in space,nil gravity.. That wing nut spin in space,comes off the thread spinning with its extra inertia.nothing to stop its spin or guide or draw it off its line of original traverse. Not restrained by the thread it has an inbuilt signal of its initial power supply. Having in air on Earth in first use, now it has a atmosphere of the space station. Resistance to the onboard air. Pressure. It gets a build up of resistance and reverses to balance of air resistance. But can’t overcome the power of the thread spinning to remove. Which was excess to requirement for its removal. It is weightless and obey its kinetic energy until it is used by some means of being attracted. It then turned to what ever mass was attracting it as it slowed. The equipment within the space station. Mass attracts weaker mass, if it has freedom to follow the attraction. Snooker ball hit too hard will bounce back and forward in the pocket jaws on Earth and not go into the pocket the rebound resistance has changed its path of drop . It has to lose it kinetic energy at its intended terminal, the pocket.

@Vary180

2 жыл бұрын

i used to flip things in my hand too, but not a hammer.

So if we dug up a bunch of mass around the equator and put it on the poles, we could get the earth to flip sideways?

@iwasbornfriday

4 жыл бұрын

maybe thats why the earth flips its poles.

@gJonii

4 жыл бұрын

That's a neat plan. Unfortunately, you'd have to fight against gravity.

@Anvilshock

4 жыл бұрын

Please note that "bunch of mass" also includes the Moon.

@Charles-fc9gi

4 жыл бұрын

No, it would be like spinning the tennis racket on the long (stable) axis. So to flip earth i think you would have to put the mass at 45° between the poles and equator. And as high as possible. Or if you put it on one pole that would work, but not both.

@malachipeterson9661

4 жыл бұрын

Most likely

Really good video!! Thanks, well explained!

This is the best explanation, thanks Derek

Veritasium: There you have it, an intuitive explanation for the intermediate axis theorem. Me: Rewatches again at .50x playback speed.

@saggitt

4 жыл бұрын

Brian C The video has to be light and entertaining enough to be popular. You can’t reasonably expect a deep detailed explanation. It was too fast for me as well to get an intuitive grasp on the process.

@loredan725

4 жыл бұрын

After watching the video, my short summary of the explanation would be "centrifugal pendulum in rotating frame of reference"

@shnider42

4 жыл бұрын

@divorcedme Whats confusing for me however is what if you were to do the flip over the intermediate axis without any 'little bump'? In such a way that there is no outside forces whatsoever and it was perfectly flipped end over end. Would it still just introduce instability itself? If so, in which direction?

@John_SalchiChon69

4 жыл бұрын

it was really simple to me /:

@ArkanoidZero

4 жыл бұрын

@@shnider42 No, a perfectly spun object around the intermediate axis would be stable, the key point he left out is that its like balancing a pencil on its point, its stable, but any small nudge and it falls over. In the real world, such stability is impossible, you will always introduce enough error for the effect to occur.

I’m just happy there is a scientific explanation for that

@Protonneutronelectron

4 жыл бұрын

Sve je to ok ali sta je sa derbijem? 😜

@yatogami7393

4 жыл бұрын

@@Protonneutronelectron Croatian?

@yatogami7393

4 жыл бұрын

@@Protonneutronelectron kako to misliš reći?

@Make_Boxing_Great_Again

4 жыл бұрын

Even if there wasn’t, there would still be an explanation, it would just be a unknown explanation.

@ftnppg1272

4 жыл бұрын

Trump supporters be like, it changes direction because god told it to. Case closed, no more discussion, solved.

Thank you. I wondered why the intermediate axial theorem didn't appear to apply to the planet. Thank you for clearing this up.

always nice to see a video that does rigid-body dynamics more justice than my faculty

So technically if we move enough mass from the equator towards the earth poles we can change the rotation axis of the earth?

@garethdean6382

4 жыл бұрын

Yup, though you'll need to move a lot and countering that masses existing RI will exert a toll too.

@kanavgagrani9744

4 жыл бұрын

If you somehow manage to take all the mass towards the poles at the same time you will experience the earth flipping gradually on your way

@alvisvalencia

4 жыл бұрын

Let’s do it

@Uocjat

4 жыл бұрын

yay! we can finally fix the true north/magnetic north alignment!

@Oscar1618033

4 жыл бұрын

@@Uocjat love the OCD 🤣

Spent all my teenage years playing with the tv remote, flipping it on the air and noticing the flip. I never asked why I couldn't flip it vertically without it turning. The trick for me was to throw it higher, so it would turn 2 times, so I would catch it how I threw it. Similar with phones when they came around. Then, older I became a bartender for a while and while flipping bottles and stuff (flair bartending) I sometimes noticed the same thing as I would try to get the label to face "forward" when the bottle landed on my hand. You just solved a mini life-long question that I had hahahaha.... kudos! (I was getting a bit judgemental when you mentioned proving Feynman wrong -- "this guy is cocky" hahaha... but then you brought Tao into play and it was all good 🤷🏻‍♂️😂 -- and anyways, is still a bit cheating as Feynman didn't have all the 3D bells and whistles we have today)

@khpsphysicsmathematics8277

4 жыл бұрын

Hmm u r R8 actually feyman thought on this only for 15 second thats not fair.

@wampaku2

4 жыл бұрын

I noticed this too in my teenage years with the remote. I asked everyone I could think of if they knew why. Parents, science teachers, etc. Nobody could provide an answer.

@1DusDB

4 жыл бұрын

Also me haha !! - noticed the flip since school days with my ruler and since then always tried with rectangle shaped things

@nate_storm

4 жыл бұрын

Flipping TV remotes is incredibly entertaining

@craigfenson

4 жыл бұрын

or it could also be that feynman perfectly understood the phenomenon, but since he was asked about an 'intuitive' explanation whilst knowing the difficulty of getting it across in a simple manner, he just said no.

Thank you!!! Ive been wondering about this for so long

Very interesting and a great explanation! Thanks!

People: They hid it for 10 years! Russian: Chill down I just forgot about it.

@davidgumazon

4 жыл бұрын

Anime Universe: Tusk Act 4!

@slaughterround643

4 жыл бұрын

"chill down"

@anandtewani7591

3 жыл бұрын

why the hell did my mind read the second line in russian accent

@zyern2822

3 жыл бұрын

@@slaughterround643 sounds Russian

@davidgumazon

3 жыл бұрын

@BlazarBlue Use Toilet Paper for Napkin!

Proving Feynman wrong is one hell of a task... yet he kinda did it ... :D

@MirorR3fl3ction

4 жыл бұрын

technically Terry Tao was the one who proved Feynman wrong, Derek just reported on it :P

@Strothy2

4 жыл бұрын

@@MirorR3fl3ction ... well credits to him then :D

@vsiegel

4 жыл бұрын

He just plain did it. Took me a while to accept that as fact.

@xapver

4 жыл бұрын

I don't pretend to be a genius, but it took me about 15 seconds after observing the videos to realize, that the rotating objects aren't balanced around the spinning axis. It's nearly impossible to do it IRL. So they have to flip, no way around it. If you are not in an ideal world, where you can apply force to one axis w/o disturbing the others along the way, of course.

@Nehmo

4 жыл бұрын

@@xapver I have to play these videos at 1.5 so that my fast mind doesn't need to slow down. And I was always having to correct Feynman when he was around. He made so many mistakes.

I noticed this 7 years ago or more when I was into butterfly knives , actually I'm not sure if it's related , but if u try to spin the butterfly knife so that the narrow part of the knife rotates it will try to open . When you spin it length wise so that longer bit is moving it will force the knife to open after a few rotations if u manage to spin it fast enough it might do it a few times too

Thanks for the simple explanation.

Hi Derek, the notification of your videos makes me throw all my work away and sit with my tab. You're incredible.

@svijayiitk

4 жыл бұрын

Me too

@chinmaykalkeri

4 жыл бұрын

same for me too!!!!!!!!!

@ScrooVonLoose

4 жыл бұрын

One of the best educators on youtube!

@eduardotapiasaez

4 жыл бұрын

+1

@tchgs11zdok15

4 жыл бұрын

😂 I was in the middle of math then I'm like, Me : I shouldn't... My brain : *it's still math only interesting*

I first observed this phonomenon 54 years ago when I was juggling books, as one does, especially at age 10. I asked again and again over the years what caused it. My parents, teachers, anyone who'd listen, No one ever had a answer. Most had never noticed it happening at all. I'm sure knife throwers must have figured how to predict it even if they didn't know the cause . Well. thanks to Veritasium, if finally got my answer last year, in 2019. 🖖

@kurtreber9813

3 жыл бұрын

I too flipped books and now that you mention it, I HAVE noticed this turn during flip. I just assumed I wasn't balancing the book very well to start.

@wonderingalbatros3603

3 жыл бұрын

@@kurtreber9813 Ditto. I'm high IQ, ADD as f$%k and embarrassed to admit I didn't question a single thing.

@christopherconner6151

3 жыл бұрын

I saw it happen as a child, saw that there was no " explanation " shrugged my shoulders and continued to twist flip things to see it's center of gravity so I could educate my self without books and others telling me their point of view. Lol

@KozmykJ

3 жыл бұрын

@@wonderingalbatros3603 I'm only 95th percentile ... a bit thick really 😜

@glenapfelstadt287

3 жыл бұрын

Ya know, some read books and others realize physical phenomena as the books fly through the air.

I've watched this video like 5 times and the hook at the begging is so good I still watch the video the whole way through

This guy solves my problems, that I never had. He's simply awesome. 😍 I always learn alot from his every video ❤

Mechanical Engineers found out many years ago that the best approach for dealing with real problems intuitively is to consider inertial forces. Otherwise, you get lost in a massive amount of equations.

@rohitchachlani9539

Жыл бұрын

enter flywheel effect

The tennis racket theorem is so cool. I saw it in my mechanics course years ago and it is still fascinating to me now.

@daltoncook3009

4 жыл бұрын

I know right! I have always flipped things like that and never new why they would spin like that. I always thought I was doing something with my wrist to cause a spin. I feel a little less special now that I know I’m not a wrist twisting master of tossing things and it’s just physics.

@marshallc6885

4 жыл бұрын

dalton cook there should be a machine that will flip it perfectly just to see if we can do it with it half turning

I loved learning from this video. Thank you so much!

I could follow really good. Thank you!

As a boy I could never get my tennis racquet to spin evenly whenever I tossed it in the air. I was obsessed and frustrated by that. Fifty years later, now I know!

@markgomez3688

4 жыл бұрын

You're never to old to learn, you can teach an old dog new tricks. A wise man once said.......

@samfreed7251

4 жыл бұрын

@@markgomez3688 TOO, with TWO O's, TO be exact.

@markgomez3688

4 жыл бұрын

@@samfreed7251 So what!... It's not like i am writing a letter to the Queen... oops Queens speech is on now , must go....

@warpigs9069

4 жыл бұрын

Basically fulcrum crowbar on invisible fulcrum crowbar.

@itshappeningla4t86

4 жыл бұрын

🤣

The goal of this video is to prove Feynman wrong. *8 minutes left.*

@DobromirManchev

4 жыл бұрын

Lol, i did the same thing! When i heard that i paused the video to check the time remaining. :D

@_BangDroid_

4 жыл бұрын

Well I don't think he succeeded, it's not very intuitive at all

@kristinejoybueno8102

4 жыл бұрын

Ow ma god ur incredible

@josephcope7637

4 жыл бұрын

This is a concept that's somewhat difficult to comprehend intuitively ... like Euler's Identity.

@przemekolchowy8745

4 жыл бұрын

@@_BangDroid_ Isn't it? Like, it's basic stuff tho. Average high schooler should get it without any problem...

Thank u veritasium, very nicely explained 👌

this is why the skateboard trick that spins on the intermediate axis is called the "impossible". You have to keep it stable with your foot.

Yay I like much that Vertasium is back at interetsing but not so popular topics.

@Snooker-cn3dm

4 жыл бұрын

yes very interenetsing indeed

I wish this guy was my science teacher back in Elementary School, Jr High School, High school, etc..

@Bollibompa

3 жыл бұрын

And this is why being a teacher should have high status in society. Unfortunately, the need for a high quantity of teachers often far outweighs the possibility to keep the quality high. An interesting sidenote: Many esteemed physicists and engineers switched to teaching high-school science in their later years. Imagine having a nobel laureate teaching you about forces and moments in ninth grade...

@markwashington2412

3 жыл бұрын

Bollibompa that exactly what happened for my grade nine math class. A former nasa astrophysicist taught us about the slopes of lines lol.

@001vgupta

3 жыл бұрын

I too would have enjoyed him, as my teacher.

@kennethkline7702

3 жыл бұрын

Actually, your science teacher was probably a lot like this guy. You were probably just an immature kid that can high school who wouldn't have listened to anyone, regardless. Unless you were the type that watched mr. Wizard in which case you would have thought your science teacher was cool anyway

@markwashington2412

3 жыл бұрын

Kenneth Kline sorry what?

Am I correct - When rotated about intermediate axis ,the body tries to rotate it into maximum MOI axis hence we se Dzhenibekof effect as it's resultant....?

Question. When the wing nut is spinning and changing rotation, I’m wondering if a body of water surrounding it would affect the spinning , how would it affect it?

Coincidence: Just started to learn about Moment of Inertia in school. This helps man.

@adityasaklani8710

4 жыл бұрын

TY for the heart.

@benjaminshields9421

4 жыл бұрын

It's like mass, for rotation. In other words, how easy is it to change the object's rotation

@deba123ful

4 жыл бұрын

Landau and Lifshithz man.. refer to that book.. that is gold

@duuhdboui2920

4 жыл бұрын

They're listening

@Anvilshock

4 жыл бұрын

This helps man, this helps animals, this helps rock, this helps universe … Let's eat grandma.

Man! I've always wondered why this happened when I flip the tv remote like that.

@tooba6290

4 жыл бұрын

Me too.. I obsessed with spinning things

@Toolmamon

4 жыл бұрын

Yes!!!! Me Too!!!!!!!!

@sillybillyno1

4 жыл бұрын

Came to comment that exact thing 😳😳

@YostPeter

4 жыл бұрын

I always thought I just had some mundane skill.

@SolvayConference

4 жыл бұрын

Wait, so if there is no "bump" then would it not exhibit that effect at all?

Man, these animations are always top notch.

Noticed this years ago while throwing knives. Never understood it. Thanks for the video!

Mum: “so what did you learn today?” Me: “it’s spinning about its maximum moment of inertia”

I had advanced dynamics for my masters, and this was the best explanation I have ever heard.

Nice video! You should consider doing a video dedicated to why we have or think we have magnetic pole shifts on the earth

@Veratisium This is a great video. I wanted to ask (for clarification): in your disc rendering of the “intuitive explanation,” it seemed to be a requirement that the two smaller point masses were slightly off of the intermediate axis. If they were not, would this effect not occur?

@samueldorrington8990

9 ай бұрын

Is it the case that in reality impossible to be perfectly balanced?

So... if we put huge weights in arctica and antarctica, we could make the earth flip?

@sanderkleinbreteler

4 жыл бұрын

No, because it is still liquid inside. It would then start spinning at a 90 angle. So half a flip...

@the_original_Bilb_Ono

4 жыл бұрын

We could use the dead useless weight of all the flat-earthers.

@dtonorth8122

4 жыл бұрын

Earth is cube

@retrogamer33

4 жыл бұрын

@@the_original_Bilb_Ono Good answer

@anantsingh1049

4 жыл бұрын

Dats illegal

Oh..., that’s why the bread always lands butter-side down.

@badusername9903

3 жыл бұрын

you bread spins when you drop it? wish my bread was that cool

@gorn9161

3 жыл бұрын

Best clinical experiment: Tape toast, butter-side up to cat and drop them from height.

@Miss_Giggy

3 жыл бұрын

That's Murphy's law.

@joaquintakanaka

3 жыл бұрын

That happens because it's heavier on the butter side, that's all.

@joaquintakanaka

3 жыл бұрын

@@DNVPIVIN It is heavier than none 😉

Amazing ... great presentation

I think i commented about this one a long while ago, i first noticed the phenomenon while flipping a TV remote just like the tennis racket. Great to get some closure :)

The crazy thing is, skateboarders, specifically, Rodney Mullen, intuitively knew this when he developed the "Impossible" skateboard trick back in the 1980s.

@yoda2661

3 жыл бұрын

The best one. Ever.

@DL-kc8fc

3 жыл бұрын

No. They attributed it to air resistance.

@starmc26

3 жыл бұрын

No.

@French20cent

2 жыл бұрын

You also watch Physics girl don't you :)

@Machtyn

2 жыл бұрын

@@French20cent On occasion. Actually landed on the Mullen - Physics Girl episode on a Tony Hawk youtube bender.

"Normally I don't like to talk about centrifugal forces" lol

@tigerchills2079

4 жыл бұрын

totally understandable statement :)

@proliferatingprofligate7032

4 жыл бұрын

"Not since _the incident,_ anyway"

@rubensanchez8118

4 жыл бұрын

Ah yes, the great centrifugal force dilemma of ‘89. How could one forget?

@jasensthename97

4 жыл бұрын

@@rubensanchez8118 This is my favorite sector of KZread ^

Thanks this is super interesting. It brings to mind the recent discoveries of the massive blobs of higher density that's been found inside the earth. Its thought that these have higher density than other parts and if you look at some 3d maps you'll see that they support these rotation theories as the blobs are centered along earths 'mid riff' so could possibly be the factor deciding earths orientation.

@davis4555

Жыл бұрын

Like the stability-bar on top of the top rotor of an RC helicopter.

Great explanation! Tks

Terry Tao was in my year 10 maths class! Starting sometime mid year, he used to come over from the primary school a couple of times a week, sit in our high school maths class. After about 6 weeks of this he was done with year 10 and moved on to year 11!

@bengunn3698

4 жыл бұрын

@Robert Ratskywatsky I went to school with einstein ,never understood why everyone raves about him the thick bastard was in ''d'' class while i was in ''b''. ;;A;; was top of the grade in those days.Little Jimmy Einstein i remember him well.

@garethb1961

4 жыл бұрын

I taught physics to Terry Tao at a university when he was 9 years old. Back then he was just a freak kid to me. Interesting to hear him being described as the greatest living mathematician. I don't think I paid him that much attention back in the day. He was just a kid who, in physics labs, had trouble with the stools, because his feet didn't reach the floor. This was Flinders University, by the way.

@JimOHalloran

4 жыл бұрын

@@garethb1961 Yeah, my memory is much the same. He was obviously a smart kid, and likely to do something important, but greatest living mathematician is high praise indeed. I was a student at Blackwood High School at the time, literally just up the road from Flinders Uni.

Many of these spins take me back to my old skateboarding days! 180 & 360 degree kickflips, heel flips, pressure flips, etc.

@p.as.in.pterodactyl1024

4 жыл бұрын

A skateboard has 3 different moments of inertia around its 3 principal axes, too! Lol.

Flipping brilliant!

@memetoo1002

Жыл бұрын

I see what you did there.

This video actually helped my tremendously in my physics class on angular momentum and torque lol

I absolutely loved this video. You are filling the void in my heart that Vsauce left behind.

@iwanttopk

4 жыл бұрын

he went to youtube red. I stopped watching after that.

@samharper5881

4 жыл бұрын

And Derek knows the difference between lay and lie anyway. VSauce did not and this is not acceptable.

@shubhamkanauji7261

4 жыл бұрын

Whyy ? Vsauce is not making videos anymore ?

@mwperk02

4 жыл бұрын

@@shubhamkanauji7261 well its a youtube red channel now but he does upload to the ding (formerly dong) channel vsauce 2 and 3 upload as normal.

@joesterling4299

4 жыл бұрын

@@mwperk02 And that's when I'll watch him. As far as many of us are concerned, information behind paywalls doesn't exist. If it's important enough or interesting enough, someone will put it out there for free.

Veritaaium: The earth is stabe. V-Sauce: Or is it?(raises eye brows)

@Goldrusher-ee3jo

4 жыл бұрын

"Kid maker" Hmmmm

@LukeMXack

4 жыл бұрын

you can hear this comment

@LoneBeastYT

3 жыл бұрын

I literally heard vsauce theme music dude

@ThatUnknownDude_

3 жыл бұрын

*SCIENCE BATTLE INTENSIFIES*

@pawan235able

3 жыл бұрын

but what if we could somehow make the earth unstable??? we all would be flipping :D :D .... need to find a flipping planet in the space and we would find alien life, cuz who doesn't want free joy rides??

Reminds me of the inertial roll coupling experienced by some aircrafts (F100, F102). This was theorized by Philips in 1948, and experienced some years later..

What about plate tectonics? As the crust is dragged under, and redistributed is there a chance that the maximum moment of inertia of the could be changed by this redistribution?

@miguelgarriga4598

2 ай бұрын

My thought as well.

That's great and all, but why is there a baby bottle on the ISS?

@AnonEMus-cp2mn

4 жыл бұрын

Baby bottles are used so babies don't spill their drink, and apparently also used so microgravity doesn't "spill" the astronaut's drink.

@josephstalin7995

4 жыл бұрын

@@AnonEMus-cp2mn yeah, but the opening, as well as the bottle, is tiny. There are many 'adult' alternatives for 'unspillable' drink bottles. Also, if I'm not mistaken, most drinks on the ISS, as well earlier space stations, are served in resealable baggies similar to a capri-sun.

@lioraselby5328

4 жыл бұрын

Because one of the astronauts is into ageplay

@Jonbug1

4 жыл бұрын

@@AnonEMus-cp2mn But why launch babies into space? It seems irresponsible...and where are their mothers??!!

@Jonbug1

4 жыл бұрын

@@lioraselby5328 Yes of course! We would be good friends...SICKO!!

I thought the reason the Russians kept this a secret was going to be so their female gymnasts would always win gold!

@kimvangvideomarketerbangko3265

2 жыл бұрын

Hah! Underrated comment

@narrator206

2 жыл бұрын

Agreed

@Icerecruit0

2 жыл бұрын

I mean their olympic athletes were at an advantage anyways for other reasons

@aozzya1563

2 жыл бұрын

@@Icerecruit0 What advantage? I don't really keep up with Olympic stuff sorry.

@Icerecruit0

2 жыл бұрын

@@aozzya1563 the Russians aren’t allowed to compete as “Russia” anymore because they used steroids lmao

This is amazing thank you!!

I was not aware of this though I have the same ring on my little finger as you have. Regarding the “centrifugal force indicated by arrows” may miss lead some. I always refer to tangent directional arrows as the “ manifestation” of the centrifugal force, as we all know that there are no centrifugal force, only the force which is retaining object in a circular path. I love your shows, very educational though I loose you in math pretty soon. I am very old but this is no excuse. Keep it up, something among the few it worse while to watch.

I experienced this with a racket when I was eight in 93’ and couldn’t explain it. My neighbor told me to stop smoking dope when i told him..........well screw you Carl!!

@laxminarayanbhandari855

2 жыл бұрын

Lol

@uhmmm2110

2 жыл бұрын

@Carl Glennerster LOL!

@devilliar3786

2 жыл бұрын

Nice fib, bro.

@pootis9180

2 жыл бұрын

i dont smoke no lope

@caesaraugustus8281

2 жыл бұрын

Lmao

Great video, would like to have seen the spinning disc animation with the 1st and 3rd axes to understand why you *don't* see the effect when rotating on those axes.

@Tsithum

4 жыл бұрын

Yep, was having the same thing in mind..

@bnord8943

4 жыл бұрын

He didn't even talk about the mass differences at all in the 'explanation' other than for defining the axes so how is this supposed to explain anything?

@marklundeberg7006

4 жыл бұрын

@@bnord8943 The mass differences do get importantly mentioned at 8:40 - 8:51. Still it would have been nice to see the rotating reference frame for other axes! Also, I'm curious whether the same approach can be used to explain the instability from energy dissipation, when rotating around the smallest-moment axis (for example, suppose the masses are not quite rigidly connected).

@jonathanodude6660

4 жыл бұрын

I think for the 1st axis the force required to flip on the heavy side is too great to be induced by the momentum of the light sides spinning and so the heavy side would actually stabilise the spin and for the 3rd axis, since all the weights are spinning in the same direction, the force on them is the same and thus small deviations in direction would influence the entire object to spin (or wobble) on an additional axis rather than a single full 180 degree turn

@Gottenhimfella

4 жыл бұрын

The difference is mentioned (but not emphasised) at 8:41 when he points out that the big masses will remain near to the original plane of their spin (because of gyroscopic stabilisation, although he does not explain this explicitly, but anyone who has played thoughtfully with rotating objects can readily see it would take a large force to perturb large masses spinning at a large radius, whereas the small masses spinning close to the axis of rotation can be easily nudged). And he goes on to point out that the large masses are effectively anchoring a new axis of rotation about which the small masses can easily swap positions. For the small masses to do this to the large masses is not plausible. And the third option does not arise because all the masses lie in a single plane of rotation, so there is no possibility of this orthogonal swap happening.

This reminds me a lot of the Wilberforce Pendulum, in which a bouncing up and down motion shifts to a rotating motion and back again, the KE phasing back and forth between the 2 modes. And there's a swinging mode also I think.

Why isn't the explanation for the intermediate (y)-axis in 8:28 not equally valid for the x-axis. A small inclination from it should give the same periodically movement in my view, the only difference is that now the mass ratio between the main rotating mass and the tilted is different... Any ideas about that? I would appreciate it :D