Gyroscopic Precession

  • Опубликовано:  5 лет назад
  • 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

    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.
  • КатегорииОбразование
  • Длительность: 3:49
  • Тэги для этого Видео:  gyroscope  precession  gyroscopic precession  spinning  rotation  rotational motion  rotational  experiments  veritasium  spin  spinning top  wobble  torque  angular momentum  

Комментарии: 2 045

  • 4one14
    4one14 19 часов назад

    Physics makes me smile :)

  • zenapsgas
    zenapsgas 1 день назад

    Rule of thumb: The direction of angular momentum follows the direction of the torque.

  • Frederick Stuart
    Frederick Stuart 6 дней назад

    I almost got it

  • Hemanth Alluri
    Hemanth Alluri 7 дней назад

    It's T = r x F, not F x r. Vector multiplication isn't commutative.

  • Andrej M
    Andrej M 9 дней назад

    Hi, why please wheel must turn its axis in direction of total angular momentum? Thanks :)

  • re frigerator
    re frigerator 12 дней назад

    not scared just laughing

  • Subarna Subedi
    Subarna Subedi 13 дней назад

    Why does cross product give a vector which is perpendicular to a plane?

  • Jijo Paul
    Jijo Paul 14 дней назад

    When the wheel is at rest, the gravity exerts a torque which makes the wheel to fall down. Now falling down means anti clockwise rotation and the angular momentum is in the same direction of the applied torque.

    And now we have the wheel spinning. At this time, we already have an angular momentum pointing in the leftward direction. Now we release the wheel. Gravity acts and applies an additional torque in the direction which is pointing outwards. So the angular momentum must increase. If I take that increased angular momentum portion, i still can't understand why the hell it is pointing upwards..?????

  • Billy Dodds
    Billy Dodds 16 дней назад

    Fidget spinners brought me here. Kill me.

  • Pichael Moon
    Pichael Moon 17 дней назад

    Hey Derek! that was so cool how you broke down the concept into simple easy to understand force vectors. Gyroscopic Precession with the bicycle wheel was something I really struggled to understand in physics class. Just wanted to say I figured out a way to explain the same concept and do the same demo with a fidget spinner on my channel so if you want to learn a little more, feel free to check it out :)

  • BoiSome
    BoiSome 21 день назад


  • heystirke300
    heystirke300 22 дня назад

    i m mind fucked

  • Demetri Reinhart
    Demetri Reinhart 25 дней назад

    You lost me

  • DevinDTV
    DevinDTV 26 дней назад

    So why doesn't it accelerate? Gravity is constantly pulling in a direction, so you'd think the procession should get faster and faster, right?

    GAAFTS 1 месяц назад

    Oooh Imma need this explained a bit slower for my young naïve mind.

  • Myfavsandlikes
    Myfavsandlikes 1 месяц назад

    Looks up angular momentum, looks up angular velocity, looks up why angular velocity vector is perpendicular, kills self.

  • Myfavsandlikes
    Myfavsandlikes 1 месяц 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?

  • aceyacey456
    aceyacey456 1 месяц назад

    This is how a single gimbal CMG works, right?

  • vogonford
    vogonford 1 месяц назад

    Got linked to this old video from Dirk from Veristablium. Always a pleasure!

  • Booster 884
    Booster 884 1 месяц назад

    I call BS, it's just a ghost riding a unicycle.

  • Martin S
    Martin S 1 месяц назад

    He should've used Zipp 808 firecrest wheels

  • Arnav Sharma
    Arnav Sharma 1 месяц назад

    which country are you from

  • Vishnu M Aiea
    Vishnu M Aiea 1 месяц назад

    So this is why you do it at the end of all videos ! Got it. But Michael does this too.

  • Danielle Matar
    Danielle Matar 1 месяц назад

    Almost got a heart attack from that ending xD

  • Luis M. Diaz Angulo
    Luis M. Diaz Angulo 1 месяц 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 Cerguz
    Mario Cerguz 1 месяц назад

    but did you die!?

  • Money Editor
    Money Editor 1 месяц назад

    Why would the torque generated by the wheel rotation change the behaviour of the torque generated by gravity? I don't understand.

  • Crowne Productions
    Crowne Productions 1 месяц назад

    Should have added in some blood splatter FX at the end there Derek.

  • koushik sriram
    koushik sriram 2 месяца назад

    Can u explain where active and reactive gyroscopic couple will act?

  • mluleki mabuza
    mluleki mabuza 2 месяца назад

    that scared me, man!

  • MoosT
    MoosT 2 месяца 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-E
      Fresh Rock Papa-E 1 месяц 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 Carpio
    Jonathan Carpio 2 месяца назад

    42.0 blaze it

  • 파양
    파양 2 месяца назад

    wow i think that is best the best!!!

  • Rumman Muhammad
    Rumman Muhammad 2 месяца назад


  • Rumman Muhammad
    Rumman Muhammad 2 месяца назад

    too good, very well presented, dear sir..

  • Man In The Sky
    Man In The Sky 2 месяца 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 Hussain
    Arsal Hussain 2 месяца назад

    You Just Make Me Jump Off From My Chair In Ending...

  • Ashok Shrestha
    Ashok Shrestha 2 месяца назад

    i hope he isn't hurt badly .. that really scared me too.....

  • RubikMaster13
    RubikMaster13 2 месяца 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 JOS 2 месяца назад

    That ending tho!

  • suresh nam
    suresh nam 2 месяца назад

    torque and angular momentum will be in the same direction.I guess so.

  • Super Miner Bilal
    Super Miner Bilal 2 месяца назад

    roblox death sound in the end lol

  • Super Miner Bilal
    Super Miner Bilal 2 месяца назад

    might do my science project on this

  • 4 E
    4 E 3 месяца назад

    does this gyroscopic precession also work on non metallic objects like plastic

  • Hogan Knott
    Hogan Knott 3 месяца назад

    r cross f, not f times r.

  • PieZello
    PieZello 3 месяца назад

    just take AP physics and you'll learn to hate this lol

  • Anime world
    Anime world 3 месяца назад

    can we use gyroscope to create a vertical thrust ?..

    by putting a gyroscopic wheel between diamagnetic plates?

  • AMVaddictionist
    AMVaddictionist 3 месяца назад

    Thank you for posting this video. Now I understand what my physics book is trying to tell me about precession.

  • atari7001
    atari7001 3 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 Beric
    Ron Beric 4 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 Harry
    Jimmy Harry 4 месяца назад

    1080p in 2012. I'm impressed

  • Fk Kwan
    Fk Kwan 4 месяца назад

    why does the angular momentum have to be in that specific direction? why not the opposite?

  • kightremin
    kightremin 4 месяца назад

    That hurts...

  • Joe Deglman
    Joe Deglman 4 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.

  • teleturbo
    teleturbo 4 месяца назад

    This explanation model is probably Walter Lewis work

  • Shivam Gupta
    Shivam Gupta 5 месяцев назад


  • Monica Robles
    Monica Robles 5 месяцев 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?

  • Pussystroker
    Pussystroker 5 месяцев назад

    OMFG I actually understood something in Physics. OMFG

  • M F
    M F 5 месяцев назад

    Nonsense. What you see here is how gravity is an electrical force.

  • BlackFiredDragon
    BlackFiredDragon 5 месяцев назад

    it's r x F, not F x r

  • kartikey nigam
    kartikey nigam 5 месяцев назад

    hey, its r x F not F x r

    • kartikey nigam
      kartikey nigam 5 месяцев 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 You
      Even Jesus Hates You 5 месяцев назад

      What the fuck's the difference?

  • 1.61803398875
    1.61803398875 5 месяцев 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 Zartash
      Hydar Zartash 4 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

  • cafewithcake
    cafewithcake 5 месяцев назад

    hmmm please watch vsauce video at this its so different i dont know wich one is right

  • The Psyborg
    The Psyborg 5 месяцев назад


  • caqo2000
    caqo2000 6 месяцев назад

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

  • Living the Dream
    Living the Dream 6 месяцев назад

    What if 2 or more gyroscope axles were connected at angles? Could the resulting torque be found by vector addition?

  • Mohammed Rayan
    Mohammed Rayan 6 месяцев назад

    warnnig jump scare at 3 42😱😨

  • Nash H-Aliyyi
    Nash H-Aliyyi 6 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 Statysta
    Dentysta Statysta 6 месяцев назад

    damned faggot i crapped my pants when the wheel had cut your head.

  • Nicholas Allan
    Nicholas Allan 6 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?

  • BOBlibob
    BOBlibob 6 месяцев назад

    What does this have to do with precision?

    • BOBlibob
      BOBlibob 6 месяцев назад

      +Grant Dever Ops, I forgot to delete my comment. I found out yesterday after studying gyroscopes. But thanks for the answer.

    • Grant Dever
      Grant Dever 6 месяцев назад

      precession not precision

  • Sheorajek
    Sheorajek 6 месяцев назад

    You mispronounced Veritasium.

  • Juno Chun
    Juno Chun 6 месяцев назад

    "I'm gonna bohrow some of their electric equipment," lol. Bohrow.

  • Frass Saeed
    Frass Saeed 6 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 rawat
      adwait rawat 6 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 Fournier
    Mash Fournier 6 месяцев назад

    Tuen this fuclinh wheel ans shut up

  • Mathoma
    Mathoma 6 месяцев назад

    Although torque is a pseudovector, right?

    • Some1NamedMe
      Some1NamedMe 5 месяцев назад

      Genuine question: what is to say that torque is the pseudovector, not radius?

    • Mathoma
      Mathoma 6 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 Reven
      Jo Reven 6 месяцев назад

      Isn't it a bivector?

    • MrSmiley
      MrSmiley 6 месяцев назад

      i thought its pterodactyl

    • Mathoma
      Mathoma 6 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 Rage
    Blood Rage 7 месяцев назад

    wow your heart is bad, after spinning the wheel u get breathless.

    • Jo Reven
      Jo Reven 6 месяцев назад

      He seems fit to me.

  • Chittaranjan Srinivas Swaminathan
    Chittaranjan Srinivas Swaminathan 7 месяцев назад

    torque is r x F. and not F x r

  • Милан Павловић
    Милан Павловић 7 месяцев назад

    Hm, you are lucky because your camera has low latency, otherwise you will be sacrificed for science :)

  • Mdw 159
    Mdw 159 7 месяцев назад

    Great vids,, I just understand why it's rotating clockwise.... "The torque and angle of momentum" :D :D :D

  • BubblesPothowari
    BubblesPothowari 7 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 Nicola
    Artemios Nicola 7 месяцев назад

    I think I'll do a more intuitive video describing the physical meaning of torque. Hold my beer.

  • Dragon Ball
    Dragon Ball 7 месяцев назад

    torque should be r×F

  • Peter Bolwell
    Peter Bolwell 7 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 Anees
    Osama Anees 8 месяцев назад

    can someone explain why torque is towards the camera and why not in its opposite direction???

    • Raghu R
      Raghu R 7 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 Fikriy
    Nuurussubchiy Fikriy 8 месяцев назад

    So this is how we can easily balancing a bike while moving, right?

    • EebstertheGreat
      EebstertheGreat 7 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 HH
    UnderMin HH 8 месяцев назад

    Jajaja The end .. epic

  • Zeqi Zhang
    Zeqi Zhang 8 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!

  • DarkRayleigh
    DarkRayleigh 8 месяцев назад

    This principe is used to dont let the particles smash against the outer wall in CERN .They are rotating.

  • Sadism2019
    Sadism2019 8 месяцев назад

    Science lessons from Joker the Alliance Pilot.

  • Roger Trefren
    Roger Trefren 8 месяцев назад

  • Jayden Stevenson
    Jayden Stevenson 8 месяцев назад

    Brilliant demo and explanation. Viewed that way, it's impossible not to understand gyroscopic behavior.

  • onehit pick
    onehit pick 8 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 Alam
    Naik Alam 8 месяцев назад

    great job.

  • Quan Vo
    Quan Vo 8 месяцев назад

    your video sucks, KYS

  • Wendy Solganik
    Wendy Solganik 9 месяцев назад

    Did his head really get cut of??? Oh, wait, no. He couldn't have posted this video if that happened.

  • slowpoke96z28
    slowpoke96z28 9 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 terrone
    geb terrone 9 месяцев назад

    why am i here watching this