Gyroscopic Precession

  • Опубликовано: 23 май 2012
  • 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.

Комментарии • 2 198

  • John Daniel
    John Daniel 6 дней назад

    Now put the mass on the outside of the wheel and see what happens. Where's the angular momentum gone? ...

  • chris4072511
    chris4072511 11 дней назад

    Defining the torque vector does't really explain anything.

  • WhiteGeared
    WhiteGeared 14 дней назад

    You messed up at 2:27. Everything was clear until then.

  • John Skiggs
    John Skiggs 14 дней назад

    Short and to the point= Didn't waste a moment = Subscribed = Thanks :)

  • Nicholas Capdevila
    Nicholas Capdevila 14 дней назад

    If I wrote t=f × r I would fail statics lol

  • Live Del Solar
    Live Del Solar 19 дней назад

    drifting guide!

  • Vishwanath V.Pai
    Vishwanath V.Pai 21 день назад

    Hey Derik, u made a mistake at 1:21.... Torque is r x F. U accidentally wrote F x r instead.

  • Prins kumar
    Prins kumar 23 дня назад

    You used the wrong formula for torque

  • Aheipa
    Aheipa 25 дней назад

    Hey there you made a mistake torque is r cross F not F cross r. Video is nice but need correction for this. 1:15

  • deiselgas
    deiselgas 28 дней назад

    For better explanation, read my post under "classical newtonian" without math:

  • forestsoceansmusic
    forestsoceansmusic Месяц назад

    How fast does it have to spin for its axis to be at 90 degrees to the vertical? (For the resultant-spin torque to be at right-angles to gravity.)

  • Filthy Filter
    Filthy Filter Месяц назад

    x0ax0a0xa0xa0xa0x0ax0a funny :D

  • M saurav
    M saurav Месяц назад

    This video is probably the best and simplest way to explain Gyroscopic effect on RUclip. Good work.

  • Zeb
    Zeb Месяц назад

    Didn't like the end scare, unsubscribed!

  • Johnny Lucas
    Johnny Lucas Месяц назад

    thank you for teaching me what i missed in lecture this morning lol

  • Abdullah Maruf
    Abdullah Maruf Месяц назад

    I honestly got scared at the end!

  • valentijnraw
    valentijnraw Месяц назад

    I love how these guys dont bother about other channels 'taking away' vieuwers from said channel. Damn, this nigga even promotes other physics channels! I love this community

  • viral ashra
    viral ashra 2 месяца назад

    helped a lot , tjanks!

  • Timothy Morris
    Timothy Morris 2 месяца назад

    Simple physics most should know but don't.

  • Saurabh Shukla
    Saurabh Shukla 2 месяца назад

    @Veritasium sir, at 1:22 you had mentioned torque = F X r ; isn't that wrong ( or at least not a good notation) ? i meant it should be r X F ...

  • Sambit Supriya Dash
    Sambit Supriya Dash 2 месяца назад

    A very helpful video. Thank You

  • Veni Vidi Amavi
    Veni Vidi Amavi 2 месяца назад

    great video, I love Destin's channel too! :)

  • Veni Vidi Amavi
    Veni Vidi Amavi 2 месяца назад

    I'm a student pilot studying for my PPL and my brain hurts but I also love this and learning about Astronomy too was always my favorite

  • Bronco 2.0
    Bronco 2.0 2 месяца назад

    Who else noticed the wagon wheel effect as the wheel spun up

  • Rishi Katta
    Rishi Katta 2 месяца назад

    Torque vector = radius vector cross product force vector.

  • Cihad
    Cihad 3 месяца назад +1

    I finally understand... apparently it's easier to understand than I thought

  • Muhammad Irfan Noor Azman
    Muhammad Irfan Noor Azman 3 месяца назад +1

    That ending scared me

  • Sagnik Saha
    Sagnik Saha 3 месяца назад +1

    The torque is written the opposite way. Cross products are anti commutative

  • G-man Moto vlog
    G-man Moto vlog 3 месяца назад +1

    uhhh..nicely done

  • LayTzz_swe HD
    LayTzz_swe HD 3 месяца назад +1

    If you don't understand this explanation, think of it like this:
    Any one point on the edge of the wheel has momentum in it's current direction, ok? Let's say it has the momentum value of 100.
    Now imagine pushing that point towards the rope, that is, perpendicular to the direction the wheel is spinning.
    Push with a force of 1.
    Now, the point has a momentum 100 in one direction and 1 in another.
    Add these together and you get a momentum of 100 + x in a slightly tilted direction.
    The path that the point will now take to go around the wheel will now be inclined from the original path. Read that until you get it.
    The point at which the point will be farthest from the original point's trajectory is roughly 90 degrees from where the force was applied.
    Therefore, the force will push up at 90 degrees and you get gyroscopic precession.

  • Bela Bessenyei
    Bela Bessenyei 3 месяца назад +1

    angular momentum is having the direction of the rotation and it is not pointing outwards! So the torque vector! The torque is only initially applied so it cannot be utilized in this example again. Angular momentum would be able to create torque only if other deceleration or acceleration would happen. So this actually work because gravity would want to accel downwards and then but that conserved downwards motion (energy) is going to rotate and therefore its component will point upwards. But the two (up and down ) have some tilt too so it would want to go outwards because this component also rotates.

  • suyash anand
    suyash anand 3 месяца назад +1

    You wrote( torque vector=Fvector × r vector) and thats wrong which confused me a bit , but otherwise rest was super cool !

  • Eric Hopper
    Eric Hopper 3 месяца назад +1

    I feel like angular momentum vector thing is hand-waving. I would like to see a more detailed analysis of all the forces in the system, including the forces holding the wheel together, for example. My feeling is that the perpendicular angular momentum vector is a convenient shorthand for something going on that has a more complex description if you tease it apart.

  • iron 12920
    iron 12920 3 месяца назад +1

    thank you for the vedio

  • Mark Brazier
    Mark Brazier 3 месяца назад +1

    Good explanations here. How about making a video showing how a gyroscope behaves in a non-inertial frame, e.g. while sat on a fixed-speed roundabout?

  • Pranjal Srivastava
    Pranjal Srivastava 4 месяца назад +1

    I crapped my pants in the end.

  • Jon Saw
    Jon Saw 4 месяца назад +1

    The explanation is WRONG. The only torque on the system is MG which he ignored it. The Force that we applied for rotation does not exist after the application. It exists in the form of angular momentum.

  • Marvel Vs Dc
    Marvel Vs Dc 4 месяца назад +1


  • Gregory Macchio
    Gregory Macchio 4 месяца назад +1

    Its actually that torque is the change in angular momentum over change in time.

  • David Harrington
    David Harrington 4 месяца назад +1

    does the axle have to be a certain length for the wheel?

  • Josué Barrientos
    Josué Barrientos 4 месяца назад

    Of you want a real explanation look the Mathias Wandel video

  • Soumyadip Poddar
    Soumyadip Poddar 4 месяца назад +1

    Hey plz tell that after releasing your left hand no torque is acting along the direction of angular momentum..but at that direction angular momentum is can u xplain that? I will make my point clear if u reply my comment

  • 蕭鈺軒
    蕭鈺軒 4 месяца назад +1

    Torque=r cross force. Not force cross r

  • abolilakhe
    abolilakhe 4 месяца назад +1

    So cool!

  • Shree yeah right
    Shree yeah right 4 месяца назад +1

    He's cute and he explains well❣️

  • 刘炯
    刘炯 4 месяца назад +1

    So that means the correct answer is Less Than?

  • chitresh apte
    chitresh apte 4 месяца назад +1

    Torque =r×F and not F×r both have different meanings

  • Sean Karl
    Sean Karl 4 месяца назад +1

    The reason why most people do not understand these kinds of explanations is because the presenter (an most lecturers for that matter) uses the word Torque and Angular Momentum. You should not use these ideas at all when explaining this you should stick to 'mass' 'time' and 'distance'. And don't use phrases like 'it tries to correct' since nothing TRIES anything and nothing is INCORRECT in your sence.

  • Rks Mehul
    Rks Mehul 4 месяца назад +1

    If u take consider standard unit vectors along the x, y, z axes ; in the video torque due to rotating the wheel is along -î and torque due to gravity is along +j^ (initially) so their resultant is along the diagonal. Now direction of torque gives axis of rotation so the axis becomes diagonal. But as wheel rotates in horizontal plane the resultant torque rotates with it . This continues and the wheel doesn't go down.
    Am I right?
    PS, torque is R vector cross F vector not F vector cross R. BTW great video.😃

  • SAGAR sudarshan
    SAGAR sudarshan 4 месяца назад

    What if we rotate in the opposite direction ( with respect to direction in the video) , would the wheel still be in balance...??? Please anyone answer

  • Nishant Hegde
    Nishant Hegde 4 месяца назад


  • 3D M's Creation
    3D M's Creation 5 месяцев назад

    Nice video dude...

  • Vishnu Sagar
    Vishnu Sagar 5 месяцев назад

    Can yu pls explain what is gyroscopic presession all about!!!

  • Lydia Jasmine
    Lydia Jasmine 5 месяцев назад

    Correction 1:15 torque =R×F

  • Abhishek Sarkar
    Abhishek Sarkar 5 месяцев назад

    awesome dude!

  • Verain_the_great
    Verain_the_great 5 месяцев назад

    Rotational mechanics is going on in my class i understood everything :D

  • Chandan Sharma
    Chandan Sharma 5 месяцев назад

    Completely visualized

  • navikesh doddi
    navikesh doddi 5 месяцев назад

    As you said torque is created at right angle to the force direction. In the example you did this from right hand side right angle, Why don't we consider the torque from left hand side?

  • Well Dam
    Well Dam 5 месяцев назад


  • Raisa Rasul
    Raisa Rasul 5 месяцев назад

    Thank you so much! This helps alot!

  • william osorio
    william osorio 5 месяцев назад

    Hey is me!! Really

  • physics physics
    physics physics 5 месяцев назад

    Could you please take down the video?

  • LouisianaBoy1990
    LouisianaBoy1990 5 месяцев назад

    Hoooh, lmfao I'm dying.. Idk why I found that ending so funny, but I'm literally crying haha..

  • Space science guy
    Space science guy 5 месяцев назад

    u r best👍👍👍

  • Aaron Trent
    Aaron Trent 5 месяцев назад

    So throughout this entire playlist (Smarter Everyday DEEP DIVE #1 - Helicopter Physics!) I've been slowly learning more and more about gyroscopic procession and angular momentum, and my mind of course has constantly been asking the question, "How?" and with each and every new revelation, "How?" and "Why?" I remember my technology teacher in highschool who was teaching us what we needed to earn CompTIA certifications telling us that we shouldn't have our CD/DVD drives sitting sideways because it would stress the drive more over time and reduce its lifespan. I thought then that she had to be wrong because theoretically a solid disc has equal mass on all sides, right? I realize now I was wrong, but I think I've also realized something else. So I have a hypothesis on this, and that is that the acceleration of gravity is affecting the wheel at all times, and so when it's not spinning it simply falls. I hope I can explain this next part clearly: So again the wheel has a mass and the acceleration of gravity is affecting that mass at all times, but acceleration is applied over time. So if you imagine one point on the wheel and imagine it's mass that's spinning at X rpm's it will still have had the force of gravity applied to it over time, but the vector of the force of gravity will change because of the wheel's spin. At different points in time it will either be working with or fighting against the acceleration of gravity. That's about as much as I've got and again it's a hypothesis. But still very cool stuff.

  • Siddharth Ss
    Siddharth Ss 5 месяцев назад

    So moral: Excessive torque is injurious to health

  • Neal Caplan
    Neal Caplan 5 месяцев назад

    I learned about this physics law in aviation school. It's used on helicopter design for directional control. A helicopter tilts its rotor "dish" in the direction of desired travel. However, to do this you have to push up on the side of the rotor that is 90 degrees before the part of the rotor that needs to rise. It certainly depends on the direction of rotation so the rule states that force applied to a spinning object is realized 90 degrees later in the direction of rotation. Wild wild stuff

  • Pat Mush
    Pat Mush 5 месяцев назад

    I like

  • Muhabbet Adamı
    Muhabbet Adamı 6 месяцев назад

    the end was The End

  • Eitan Sheffer
    Eitan Sheffer 6 месяцев назад

    it's r cross f

  • hAnumAn dAsAm
    hAnumAn dAsAm 6 месяцев назад

    hey u mentioned the formulated vectors in wrong.But ur xplntn was good

  • Digvijay Singh
    Digvijay Singh 6 месяцев назад

    People appreciating him are not observant and are totally dumb. He wrote torque= F x r, but the torque is defined as r x F and these two are different things.

  • victor guerra
    victor guerra 6 месяцев назад

    so if you made the arm of the wheel longer it will rotate faster ?
    ignoring mass

  • Addhyan Milan Ravel
    Addhyan Milan Ravel 6 месяцев назад


  • Rhey Jen Crusem
    Rhey Jen Crusem 6 месяцев назад

    the ending gives me reflex.

  • namelessone
    namelessone 6 месяцев назад

    This video failed to explain why tork already exist in system (because of weight) cause wheel swing down but but rotate it if another tork is avaible in system but orthogonal direction.
    He clearly shows the tork's avaible on system while wheel moving pointing different directions.
    We wonder exactly why the tork caused by turning pointing complelty different (orthogonal) direction effects the way work the other tork caused by weight.

  • Aboo Swaleh Mosafeer
    Aboo Swaleh Mosafeer 6 месяцев назад

    This is an explanation to people who already know about to those who don't know we are are just left dazed...

  • Abdullah bin Mohideen
    Abdullah bin Mohideen 6 месяцев назад

    total waste time wast

  • Syed Waqas Haider
    Syed Waqas Haider 7 месяцев назад

    torque = r x F and not F x r

  • Vista Panoramica by Lello
    Vista Panoramica by Lello 7 месяцев назад +3

    Hi there, first Of all contrata on The chanell!!! I love it!!!I'm a Airbus captain and I also fly helicopters and I always had a question about precession that nobody that I know can answer me...What is the speed that a disc must be turning to begin having the gyroscopic precession?!?

    • Vista Panoramica by Lello
      Vista Panoramica by Lello 2 месяца назад

      Thanks Marek... thanks a lot!!!

    • Marek Ważyński
      Marek Ważyński 2 месяца назад

      Physics work at every speed, it's just that the forces may be too small to have an observable effect on the disc if the speed is low. The answer would be then: any speed, you just may not be able to see it.

    • Jesse Vos
      Jesse Vos 4 месяца назад

      (it's a joke)((or maybe i'm just stupid and you double joked me))

    • Vista Panoramica by Lello
      Vista Panoramica by Lello 5 месяцев назад

      Thanks a lot Claudius!!!
      but 42 what?!?

  • mahmud shawon
    mahmud shawon 7 месяцев назад

    Thank u , really learnt from you

  • oosveluzo levso
    oosveluzo levso 7 месяцев назад

    if you flip it, it will start turning the opposite direction, try it.

  • TheImpetus
    TheImpetus 7 месяцев назад

    Torque: easy to compute, makes no intuitive sense whatsoever lol

  • naveen reddi
    naveen reddi 7 месяцев назад

    Nailed it bro

  • Brian Skinner
    Brian Skinner 7 месяцев назад +1

    How humbling is the pursuit of knowledge. I came here after a several week long binge of spinning tops, and it took me that long to formulate the question relating to momentum and procession. I am a retired carpenter and the only math I have ever used is Trigonometry for stairs and rafters.

  • syed moris
    syed moris 7 месяцев назад

    The direction of angular momentum doesnt have any physical meaning the thumb rule is just a convention, right brothers?

  • Rumman Muhammad
    Rumman Muhammad 7 месяцев назад

    coincidentally 'torque is not as confused as you..take a break of wisdom..or u confuse us all..

  • The Mastermind
    The Mastermind 7 месяцев назад

    Why did the end scare me? I totally saw it coming

  • JL Uy
    JL Uy 7 месяцев назад


  • Abhay Bhardwaj
    Abhay Bhardwaj 8 месяцев назад

    vsauce "spinning" anyone?

  • Max Lake
    Max Lake 8 месяцев назад

    torque vector of a black hole is the same.

  • scRam Jet
    scRam Jet 8 месяцев назад

    isn't that because the wheel spins in the same speed as it falls rather than Gyroscopic Precession? Correct me i am probably wrong

  • Alfred Shitcock
    Alfred Shitcock 8 месяцев назад

    Why does torque follow a right hand rule and not a left hand rule? Why isn't it symmetrical? I'm confused.

    • AL Coll
      AL Coll 3 месяца назад

      Alfred Shitcock
      Notice that the torque always points in the direction where angular momentum is physically changing.

  • noonesperfect
    noonesperfect 8 месяцев назад

    this is an awesome video....

  • 4one14
    4one14 8 месяцев назад

    Physics makes me smile :)

  • zenapsgas
    zenapsgas 8 месяцев назад

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

  • Frederick Stuart
    Frederick Stuart 9 месяцев назад

    I almost got it

  • Hemanth V. Alluri
    Hemanth V. Alluri 9 месяцев назад

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

  • Andrej Michalica
    Andrej Michalica 9 месяцев назад

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