Gyroscopic Precession


NOTE: This video will appear in a playlist on Smarter Every Day hence the references to Veritasium. Destin does lots of cool science stuff - check out his channel if you haven't already http://www.youtube.com/destinws2

We have been collaborating on rotational motion, which is timely for some of the videos I've been doing lately. In this video I talk about gyroscopic precession - the "wobbling" of a spinning top around its axis.

This is caused by the torque due to the object's weight. The big idea is that the torque vector increases angular momentum in the direction of torque. So if there is no angular momentum initially, it will cause the system to swing in such a direction that it is rotating with new angular momentum in the direction of the torque. However, if there was angular momentum to begin with, the torque will change the direction of that angular momentum by causing precession.

Видео загрузил: Veritasium


Просмотров: 2403583
Добавлено: 5 лет назад
Длительность: 3:49
Комментарии: 2020

Тэги для этого Видео:gyroscope  precession  gyroscopic precession  spinning  rotation  rotational motion  rotational  experiments  veritasium  spin  spinning top  wobble  torque  angular momentum  



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Комментарии:

MyfavsandlikesMyfavsandlikes (3 дня назад)
Looks up angular momentum, looks up angular velocity, looks up why angular velocity vector is perpendicular, kills self.

MyfavsandlikesMyfavsandlikes (3 дня назад)
I don't understand when he tries to explain angular momentum from dropping the wheel. I thought angular momentum required the object to be rotating?

aceyacey456aceyacey456 (5 дней назад)
This is how a single gimbal CMG works, right?

vogonfordvogonford (11 дней назад)
Got linked to this old video from Dirk from Veristablium. Always a pleasure!

Sebastian GielensSebastian Gielens (11 дней назад)
I call BS, it's just a ghost riding a unicycle.

Martin SMartin S (12 дней назад)
He should've used Zipp 808 firecrest wheels

Arnav SharmaArnav Sharma (13 дней назад)
which country are you from

Vishnu M AieaVishnu M Aiea (13 дней назад)
So this is why you do it at the end of all videos ! Got it. But Michael does this too.

Danielle MatarDanielle Matar (17 дней назад)
Almost got a heart attack from that ending xD

Luis M. Diaz AnguloLuis M. Diaz Angulo (20 дней назад)
torque is r times F, not F times r. It is important if you are making a vector product because there is a change of sign.

Mario CerguzMario Cerguz (21 день назад)
but did you die!?

Money EditorMoney Editor (22 дня назад)
Why would the torque generated by the wheel rotation change the behaviour of the torque generated by gravity? I don't understand.

Crowne ProductionsCrowne Productions (22 дня назад)
Should have added in some blood splatter FX at the end there Derek.

koushik sriramkoushik sriram (25 дней назад)
Can u explain where active and reactive gyroscopic couple will act?

mluleki mabuzamluleki mabuza (25 дней назад)
that scared me, man!

MoosTMoosT (1 месяц назад)
What would happen if you spin it the other way around? In this case the right-hand-rule would point to the other direction or am I wrong?

Fresh Rock Papa-EFresh Rock Papa-E (23 дня назад)
The vectors would go the other way around. It would all be the same, except that the wheel would spin the other way around the rope.

Jonathan CarpioJonathan Carpio (1 месяц назад)
42.0 blaze it

파양파양 (1 месяц назад)
wow i think that is best the best!!!

Rumman MuhammadRumman Muhammad (1 месяц назад)
cool.............

Rumman MuhammadRumman Muhammad (1 месяц назад)
too good, very well presented, dear sir..

Man In The SkyMan In The Sky (1 месяц назад)
I understand this was one of your earlier videos. But you could've explained 1) vectors have magnitude and direction not just direction. I understand that was just a mistake. 2) given you spent time to point out the torque vectors you should've made it more explicit that the gyro spin was because of the vector sum of the two torques. You mentioned them but didn't explain explicitly the vector sum points in the direction which would cause the gyro spin. Otherwise good video.

Arsal HussainArsal Hussain (1 месяц назад)
You Just Make Me Jump Off From My Chair In Ending...

Ashok ShresthaAshok Shrestha (1 месяц назад)
i hope he isn't hurt badly .. that really scared me too.....

RubikMaster13RubikMaster13 (1 месяц назад)
The thing I don't understand stand is this. Torque is angular force. You apply a torque to change the angular momentum of an object by increasing its angular velocity. If an object is rotating with a constant angular velocity, there is no torque being applied to it. The same as if an object is traveling with a constant velocity, there is no force applied to it. Once Derek has got the wheel spinning, there is no longer any torque on the wheel. So why does the wheel process instead of falling?

DANG JOSDANG JOS (1 месяц назад)
That ending tho!

suresh namsuresh nam (1 месяц назад)
torque and angular momentum will be in the same direction.I guess so.

Super Miner BilalSuper Miner Bilal (1 месяц назад)
roblox death sound in the end lol

Super Miner BilalSuper Miner Bilal (1 месяц назад)
might do my science project on this

4 E4 E (2 месяца назад)
does this gyroscopic precession also work on non metallic objects like plastic

Hogan KnottHogan Knott (2 месяца назад)
r cross f, not f times r.

PieZelloPieZello (2 месяца назад)
just take AP physics and you'll learn to hate this lol

Anime worldAnime world (2 месяца назад)
can we use gyroscope to create a vertical thrust ?..


by putting a gyroscopic wheel between diamagnetic plates?

AMVaddictionistAMVaddictionist (2 месяца назад)
Thank you for posting this video. Now I understand what my physics book is trying to tell me about precession.

atari7001atari7001 (2 месяца назад)
Newtonian physics presumes that the momentum of the spinning wheel cannot change no matter what we do to the position or location of the gyro. If we assume this to be true, then what happens to the energy of the system when a torque is applied such that the orientation of the axis is changed and the gyro is forcibly precessed?

Since energy = force x distance, we've spent some energy, but where has it gone? The gyro will naturally resist this influence and come to a stop when the force is removed. Therefore, where has the energy gone? This to me seems even more mysterious than the precession motion itself.

Ron BericRon Beric (2 месяца назад)
If you go to his website this week, I think it’s the final chance to get a copy of Woody Hyezmar’s woodworking Book, google it.

Jimmy HarryJimmy Harry (2 месяца назад)
1080p in 2012. I'm impressed

Fk KwanFk Kwan (2 месяца назад)
why does the angular momentum have to be in that specific direction? why not the opposite?

kightreminkightremin (3 месяца назад)
That hurts...

Joe DeglmanJoe Deglman (3 месяца назад)
So is the torque the same as a motor, I mean a metal object rotating in a magnetic field? What would happen if the entire wheel were plastic?   Is it a static electric force that creates the torque? It does have the right hand rule just like electricity in a wire.

teleturboteleturbo (3 месяца назад)
This explanation model is probably Walter Lewis work

Shivam GuptaShivam Gupta (3 месяца назад)
Awesome

Monica RoblesMonica Robles (3 месяца назад)
Question here!

I want to analyze and explain precession, so I'll do the bike wheel project and all. However, I'm required to measure variants and all. What do I measure and how? The force applied is the controlled variant, and the torque is the dependable, which is the indepentable variant?

PussystrokerPussystroker (4 месяца назад)
OMFG I actually understood something in Physics. OMFG

M FM F (4 месяца назад)
Nonsense. What you see here is how gravity is an electrical force.

BlackFiredDragonBlackFiredDragon (4 месяца назад)
it's r x F, not F x r

kartikey nigamkartikey nigam (4 месяца назад)
hey, its r x F not F x r

kartikey nigamkartikey nigam (4 месяца назад)
+Even Jesus Hates You
bro in case of vectors r x f and f x r makes difference as direction in both cases is different. For detailed info google "cross product"😁

Even Jesus Hates YouEven Jesus Hates You (4 месяца назад)
What the fuck's the difference?

1.618033988751.61803398875 (4 месяца назад)
I was always wondering with gyros if you introduce anti-torque to the suspended wheel ie force it not to spin around will it fall or will it stop rotating?

Hydar ZartashHydar Zartash (3 месяца назад)
it would fall, and then stop spinning, as the forces cancelled each other out, the torque would immediately take over, and the wheel would stop slowly

cafewithcakecafewithcake (4 месяца назад)
hmmm please watch vsauce video at this its so different i dont know wich one is right

The PsyborgThe Psyborg (4 месяца назад)
Jumpscare

caqo2000caqo2000 (4 месяца назад)
(2:34) Could PLEASE anyone explain me why this mentioned torque goes/points that way (to the camera)?

Living the DreamLiving the Dream (5 месяцев назад)
What if 2 or more gyroscope axles were connected at angles? Could the resulting torque be found by vector addition?

Mohammed RayanMohammed Rayan (5 месяцев назад)
warnnig jump scare at 3 42😱😨

Nash H-AliyyiNash H-Aliyyi (5 месяцев назад)
Sorry man this is not good explanation, whats up with memorizing hand rules,?! Just explain torque momentum and gravity falling effect that constantly battle!, resulting in new vector that moves also constantly side way= rotation.

Dentysta StatystaDentysta Statysta (5 месяцев назад)
damned faggot i crapped my pants when the wheel had cut your head.

Nicholas AllanNicholas Allan (5 месяцев назад)
Is it slowing down because of friction, or is it slowing down because the torque cause by gravity is opposing and slowing down the angular momentum? Would it not fall the way it did in a "frictionless" environment?

BOBlibobBOBlibob (5 месяцев назад)
What does this have to do with precision?

BOBlibobBOBlibob (5 месяцев назад)
+Grant Dever Ops, I forgot to delete my comment. I found out yesterday after studying gyroscopes. But thanks for the answer.

Grant DeverGrant Dever (5 месяцев назад)
precession not precision

SheorajekSheorajek (5 месяцев назад)
You mispronounced Veritasium.

Juno ChunJuno Chun (5 месяцев назад)
"I'm gonna bohrow some of their electric equipment," lol. Bohrow.

Frass SaeedFrass Saeed (5 месяцев назад)
Can someone explain to me what torque is? And why does it have the tendency to go out (perpendicular) toward me in the first place? Thanks!

adwait rawatadwait rawat (5 месяцев назад)
like force produces translatory motion, torqe produces rotation. it does not tend to go perpendicular it needs to be perpendicular to produce rotation. and it is a convention to convert rotatory vector into linear vectors for convenience by the right hand thumb rule. google it you will see.

Mash FournierMash Fournier (5 месяцев назад)
Tuen this fuclinh wheel ans shut up

MathomaMathoma (5 месяцев назад)
Although torque is a pseudovector, right?

Some1NamedMeSome1NamedMe (4 месяца назад)
Genuine question: what is to say that torque is the pseudovector, not radius?

MathomaMathoma (5 месяцев назад)
+Joe Reven
Indeed. You can define it as r ∧ F using the wedge product instead of the usual r x F using the cross product. The bivector seems more natural and direct since the rotation gets encoded right into the signed area as opposed to the cross product vector which is orthogonal to the plane of rotation.

Jo RevenJo Reven (5 месяцев назад)
Isn't it a bivector?

MrSmileyFella2MrSmileyFella2 (5 месяцев назад)
i thought its pterodactyl

MathomaMathoma (5 месяцев назад)
+Faruk, Bughaba
Well, torque isn't really a _special_ vector because it's not a vector quantity at all. I think you mean that the pseudovector has an additional sign flip upon mirror reflection.

Blood RageBlood Rage (6 месяцев назад)
wow your heart is bad, after spinning the wheel u get breathless.

Jo RevenJo Reven (5 месяцев назад)
He seems fit to me.

Chittaranjan Srinivas SwaminathanChittaranjan Srinivas Swaminathan (6 месяцев назад)
torque is r x F. and not F x r

Милан ПавловићМилан Павловић (6 месяцев назад)
Hm, you are lucky because your camera has low latency, otherwise you will be sacrificed for science :)

Mdw 159Mdw 159 (6 месяцев назад)
Great vids,, I just understand why it's rotating clockwise.... "The torque and angle of momentum" :D :D :D

BubblesPothowariBubblesPothowari (6 месяцев назад)
Torque : Force x Distance. Bicycle pedals. Simple Lever. Larger the distance between point of application and the pivot, larger the Torque.

Precession. When a force, Torque is applied to a Gyroscope, the force effect precesses 90* in the direction of the rotation. Eg. When riding a bicycle, hands free, when I bank left, the the force applied at the top of the rim, pushing it left, precesses forward by 90* in the direction of the rotation of the wheel, and turns the wheel Left. ie The Torque on top of the rim, instead of left tilt, it gives left Yaw. That is precession.

Artemios NicolaArtemios Nicola (6 месяцев назад)
I think I'll do a more intuitive video describing the physical meaning of torque. Hold my beer.

Dragon BallDragon Ball (6 месяцев назад)
torque should be r×F

Peter BolwellPeter Bolwell (6 месяцев назад)
So applying this to the Earth as a whole, if the planet is rotating on its axis around the equator then ("using the right-hand rule") the torque should make the planet travel upwards in the direction of the north pole out of the plane of the solar system, rather than round the ecliptic (as it does). Why is this?

Osama AneesOsama Anees (6 месяцев назад)
can someone explain why torque is towards the camera and why not in its opposite direction???

Raghu RRaghu R (6 месяцев назад)
Direction of rotation of the wheel is anti-clockwise. Fingers in right hand thumb rule also is anti-clockwise and thumb is pointing towards the camera.

Nuurussubchiy FikriyNuurussubchiy Fikriy (7 месяцев назад)
So this is how we can easily balancing a bike while moving, right?

EebstertheGreatEebstertheGreat (6 месяцев назад)
The ability to balance a moving bike actually has more to do with steering the front wheel under the bike as it tips to one side (though it is, of course, enormously more complicated than this). A bicycle with locked handlebars is very unstable. Gyroscopic precession does contribute to stability somewhat at high speeds, though tests of people using bikes with attached counter-rotating wheels that should completely cancel the gyroscopic effects seem to show it doesn't matter much. Wikipedia has a pretty good article about this.

UnderMin HHUnderMin HH (7 месяцев назад)
Jajaja The end .. epic

Zeqi ZhangZeqi Zhang (7 месяцев назад)
That's extremely clear and logical for me, make perfect sense! Thank you for dedicate yourself to doing all of the awesome stuff in your channel and applying science in to real world! You are my idol seriously!

DarkRayleighDarkRayleigh (7 месяцев назад)
This principe is used to dont let the particles smash against the outer wall in CERN .They are rotating.

Sadism2019Sadism2019 (7 месяцев назад)
Science lessons from Joker the Alliance Pilot.

Roger TrefrenRoger Trefren (7 месяцев назад)
https://youtu.be/-SoWIhuYg6Q

Jayden StevensonJayden Stevenson (7 месяцев назад)
Brilliant demo and explanation. Viewed that way, it's impossible not to understand gyroscopic behavior.

onehit pickonehit pick (7 месяцев назад)
The explanation is just rules, and gives no intuitive understanding of precession, leaving it as magic while it is very possible to fathom. We should teach the actual mechanisms why, and not just the rules. To understand why the wheel precesses, you have to follow all the small (incremental) parts of the wheel as they progress, and the forces applied.

Naik AlamNaik Alam (7 месяцев назад)
great job.

Quan VoQuan Vo (7 месяцев назад)
your video sucks, KYS

Wendy SolganikWendy Solganik (7 месяцев назад)
Did his head really get cut of??? Oh, wait, no. He couldn't have posted this video if that happened.

slowpoke96z28slowpoke96z28 (8 месяцев назад)
the way I saw it demonstrated in high school was holding the wheel while sitting in a swiveling chair. whichever way you leaned the wheel, the chair would swivel in that direction lol. it was pretty sweet.

geb terronegeb terrone (8 месяцев назад)
why am i here watching this

excited inspiredexcited inspired (8 месяцев назад)
torque is not pointing out like that, it is angular velocity & torque is moment which is circular shown by the arrow on the wheel..

Roger HolmesRoger Holmes (8 месяцев назад)
At 2:34, how is the torque toward that direction? and at 2:57, how is the torque perpendicular to the angular momentum? aren't they supposed to be along the same direction?

Myrissa LongMyrissa Long (8 месяцев назад)
this is cool

Johnny BatafljeskaJohnny Batafljeska (8 месяцев назад)
Nice video.. but vector product does note commute.. T = r x F

terrysarmy2695terrysarmy2695 (8 месяцев назад)
dewwwwwwwwwwdd, I totally get it now!!!

cok Baguscok Bagus (8 месяцев назад)
wait, if you have the angular momentum going out. wouldn't that make the wheel spin the other way around?

Alejandro LemusAlejandro Lemus (8 месяцев назад)
Damn, you are awesome! Greetings from Guatemala!

Gummy BugzGummy Bugz (9 месяцев назад)
EXPLANATION FOR ANYONE WHO DOESN'T GET IT:
I spent the last hour reading up on this, confused by wording and concepts, but I think I finally understand, and I want to explain as clearly as I possibly can for everyone else in my position. As well, please tell me if I made any mistakes.
So, gyroscopic precession. First, momentum is the energy stored by a moving object. Angular momentum is stored in a rotating object - since all sides of the wheel rotate, they all have momentum, often called centrifugal force in the case of rotating objects, pulling out from the center of the wheel. normally, when he would let go of the wheel, since it is suspended on the right, it would tilt to the left and fall.
two lines= wheel; one line = suspension point
Wheel: []-
then: \\-
then: |
==

since it has to tilt to the left to fall, that means that the top of the wheel is getting pulled to the left, and the bottom is getting pulled to the right (push the top of a glass to your left, it falls over to the left, same thing here). However, that force takes a small amount of time to act, and by the time it is pulling the top of the wheel left, that part it is pulling is no longer the top, since it is spinning. That part of the wheel is now on the far (back) side relative to the camera. when it gets pulled left, it now moves the back of the wheel to the left, and the front of the wheel to the right. In this way, this makes the whole thing turn instead of fall. Weird.

Gummy BugzGummy Bugz (21 день назад)
addendum: the force doesn't actually "take time to act," it is instantaneous, but what it does is change that point on the wheel's velocity. And velocity doesn't affect anything instantaneously, so you don't see the effects until later, when it has had time for the changed velocity to have an impact.

Tanuj GuhaTanuj Guha (22 дня назад)
such a simple and amazing explanation, thank you sir!

RoadfartRoadfart (5 месяцев назад)
Well explained, Gummy Bugz. There are some videos that explain this using earth/satellite illustrations which are much easier for me to understand than this video which, in my opinion, wasn't really aimed at a large audience but only those with some prior knowledge.

Gummy BugzGummy Bugz (6 месяцев назад)
+matszz The answer is that we have two different definitions of mass. There is inherent mass that a particle possesses just by existing as that particle. By the famous E=mc^2, we can know that energy is proportional to mass. This means that we can also add mass to an item by imbuing it with energy, and light is a form of energy. So while a photon has no mass for just being a photon, light will be affected by gravity because it possesses energy. Our current best idea is that all energy warps spacetime in a way that we perceive as gravity. So the energy that light contains gives it mass. Of course, this does not mean that all photons have a given mass if we assume they are part of a light beam. Actually, the energy a photon contains is directly related to the frequency of the light that it is transmitting; all of the energy and therefore mass of a light beam comes from the wave.

Shashank LaurShashank Laur (9 месяцев назад)
Then cars must be able to turn left easily at high speeds rather than right... right? OR is it negligible?

Kai WidmanKai Widman (9 месяцев назад)
I'm going to be honest, you straight up jump scared me there at the end.

Michal NemecekMichal Nemecek (9 месяцев назад)
if you play that sound about 15 times in a row, the last one will sound like "umluh"

gurunath Reddygurunath Reddy (9 месяцев назад)
i didnt get about spin axis
can u explain that

Too_FunnyToo_Funny (9 месяцев назад)
Did he just quadruple Vsauce at the end there?

Европейский ЧудакиЕвропейский Чудаки (9 месяцев назад)
Average stereo typical UFO explained.

Taher ZadranTaher Zadran (10 месяцев назад)
Who is watching in 2016

Redwan AliRedwan Ali (10 месяцев назад)
Love u man

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