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 • 2 219

  • 村里英明
    村里英明 День назад

    my experimentation is simple problem.

  • Onder Ozenc
    Onder Ozenc 5 дней назад

    A lot of things in physics are vectors and reference frames. The precession motion is relevant to all spinning objects, be it an helicopter shaft, aeroplane propeller or the earth itself. It arises from the centrifugal force experienced by the spinning objects around an axis especially with high angular velocity. The lateral component of this force ``imagine the spherical coordinate frame`` incorporates the ``harmonic`` force whose torque causing the precesion of the object. This phenomenon is pretty complicated but generally referred by aeronautics.

  • Jagjit Roudh
    Jagjit Roudh 5 дней назад

    Stop turning the wheel! That red arrow is gonna get me!

  • weskergeorge97
    weskergeorge97 7 дней назад

    Mate you look a bit like Elon Musk

  • H C
    H C 8 дней назад

    Sorry mate but you didn't get why it actually works.

  • Ado Sar
    Ado Sar 9 дней назад

    so the axis of rotation also changes direction ? also why rope start making like circular motion ?

  • Sudha Vasu
    Sudha Vasu 14 дней назад

    So can you change the direction of the torque

  • udit saxena
    udit saxena 15 дней назад

    Thanks alot

  • The Juk
    The Juk 24 дня назад

    Wasn't it r cross F?

  • Kuruvilla Mani
    Kuruvilla Mani 28 дней назад

    That warm feeling when you suddenly get it!! Oh.. such satisfaction

  • Kerplunk
    Kerplunk Месяц назад

    3:00 오른손법칙에 따른 자이로모멘트 방향의 계산
    1. 바퀴의 자전방향 회전벡터: 검지(두번째 손가락)
    2. 자중에 의해 바퀴에 가해지는 회전벡터: 중지(세번째 손가락)
    3. 각운동량 보존에 의해 발생되는 자이로모멘트 회전벡터: 엄지(첫번째 손가락)
    3:04 정지화면에서 중지가 내 몸, 검지가 왼쪽, 엄지가 하늘방향을 가르키게 됨

  • MinistryMuzik
    MinistryMuzik Месяц назад


  • James Wampler
    James Wampler Месяц назад

    Why does the equation have an annotation over it?

  • Philip Kuo
    Philip Kuo Месяц назад

    Very clear audio, way better than our recorded lectures here at the University of Illinois.

  • Craig Diamond
    Craig Diamond Месяц назад

    Here is my question....if forced linear acceleration is the same as gravity, and gravity causes gyroscopic precession, then shouldn't forced gyroscopic precession result in linear acceleration?

  • Abhaya Raj Khatri
    Abhaya Raj Khatri Месяц назад

    Oh that’s where my bike wheel went

  • James Kiley
    James Kiley Месяц назад

    The earth utilizes this unique phenomenon. Without it, we would fall into the sun.

  • sandeep sharma
    sandeep sharma Месяц назад

    can same gyroscopic effect apply for square wheel?

  • 村里英明
    村里英明 Месяц назад


  • M. Saleh
    M. Saleh Месяц назад

    A nice video to get the ball rolling. I will also recommend watching Prof. Walter Lewin's lecture on rolling motion and gyroscopes. It includes actual science, which will answer many of the questions, that I've read here in the comments. He also explained it with a wheel plus a gyroscope.

  • anton p
    anton p Месяц назад


  • Hen Hen 601
    Hen Hen 601 Месяц назад

    I almost felt the pain at the end

  • Prajnadatta Meher
    Prajnadatta Meher Месяц назад

    42 ??

  • Kokulan Selvakumaran
    Kokulan Selvakumaran Месяц назад


  • n40798
    n40798 2 месяца назад

    What determines the direction of the torque vector? If he spins the wheel down, what causes the torque to point to his right instead of his left?

  • Hades Freyr
    Hades Freyr 2 месяца назад

    Helicopters don't fly with the laws of aerodynamics, he fly because the centrifugalpower is greater than the gravitation of our planet. Installing a rotor under your car will reduce the weight of the car. If the rotor moving fast enough, the car will fly, Levitation. we have not enough money to build this one without licence, perhaps someone of you....

  • Vaibhav Misra
    Vaibhav Misra 2 месяца назад

    I wish you had written T=r x F.

  • John Daniel
    John Daniel 2 месяца назад

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

  • chris4072511
    chris4072511 2 месяца назад

    Defining the torque vector does't really explain anything.

  • WhiteGeared
    WhiteGeared 2 месяца назад

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

  • John Skiggs
    John Skiggs 2 месяца назад

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

  • Nicholas Capdevila
    Nicholas Capdevila 2 месяца назад

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

  • Live Del Solar
    Live Del Solar 2 месяца назад

    drifting guide!

  • Vishwanath V.Pai
    Vishwanath V.Pai 2 месяца 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 3 месяца назад

    You used the wrong formula for torque

  • Aheipa
    Aheipa 3 месяца 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 3 месяца назад

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

  • forestsoceansmusic
    forestsoceansmusic 3 месяца 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 3 месяца назад

    x0ax0a0xa0xa0xa0x0ax0a funny :D

  • M saurav
    M saurav 3 месяца назад

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

  • Zeb
    Zeb 3 месяца назад

    Didn't like the end scare, unsubscribed!

  • Johnny Lucas
    Johnny Lucas 3 месяца назад

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

  • Abdullah Maruf
    Abdullah Maruf 4 месяца назад

    I honestly got scared at the end!

  • valentijnraw
    valentijnraw 4 месяца 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 4 месяца назад

    helped a lot , tjanks!

  • Timothy Morris
    Timothy Morris 4 месяца назад

    Simple physics most should know but don't.

  • Saurabh Shukla
    Saurabh Shukla 4 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 4 месяца назад

    A very helpful video. Thank You

  • Veni Vidi Amavi
    Veni Vidi Amavi 4 месяца назад

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

  • Veni Vidi Amavi
    Veni Vidi Amavi 4 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 4 месяца назад

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

  • Rishi Katta
    Rishi Katta 5 месяцев назад

    Torque vector = radius vector cross product force vector.

  • Cihad
    Cihad 5 месяцев назад +1

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

  • Muhammad Irfan Noor Azman
    Muhammad Irfan Noor Azman 5 месяцев назад +1

    That ending scared me

  • Sagnik Saha
    Sagnik Saha 5 месяцев назад +1

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

  • G-man Moto vlog
    G-man Moto vlog 5 месяцев назад +1

    uhhh..nicely done

  • LayTzz_swe HD
    LayTzz_swe HD 5 месяцев 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 5 месяцев 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 5 месяцев 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 5 месяцев 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 5 месяцев назад +1

    thank you for the vedio

  • Mark Brazier
    Mark Brazier 5 месяцев 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 6 месяцев назад +1

    I crapped my pants in the end.

  • Jon Saw
    Jon Saw 6 месяцев 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.

  • Ringtone Bazaar
    Ringtone Bazaar 6 месяцев назад +1


  • Gregory Macchio
    Gregory Macchio 6 месяцев назад +1

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

  • David Harrington
    David Harrington 6 месяцев назад +1

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

  • Josué Barrientos
    Josué Barrientos 6 месяцев назад

    Of you want a real explanation look the Mathias Wandel video

  • Soumyadip Poddar
    Soumyadip Poddar 6 месяцев 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 6 месяцев назад +1

    Torque=r cross force. Not force cross r

  • abolilakhe
    abolilakhe 6 месяцев назад +1

    So cool!

  • Shree yeah right
    Shree yeah right 6 месяцев назад +1

    He's cute and he explains well❣️

  • 刘炯
    刘炯 6 месяцев назад +1

    So that means the correct answer is Less Than?

  • chitresh apte
    chitresh apte 6 месяцев назад +1

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

  • Sean Karl
    Sean Karl 7 месяцев 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 7 месяцев 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 7 месяцев 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 7 месяцев назад


  • 3D M's Creation
    3D M's Creation 7 месяцев назад

    Nice video dude...

  • Vishnu Sagar
    Vishnu Sagar 7 месяцев назад

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

  • Lydia Jasmine
    Lydia Jasmine 7 месяцев назад

    Correction 1:15 torque =R×F

  • Abhishek Sarkar
    Abhishek Sarkar 7 месяцев назад

    awesome dude!

  • Verain_the_great
    Verain_the_great 7 месяцев назад

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

  • Chandan Sharma
    Chandan Sharma 7 месяцев назад

    Completely visualized

  • navikesh doddi
    navikesh doddi 7 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 8 месяцев назад


  • Raisa Rasul
    Raisa Rasul 8 месяцев назад

    Thank you so much! This helps alot!

  • william osorio
    william osorio 8 месяцев назад

    Hey is me!! Really

  • physics physics
    physics physics 8 месяцев назад

    Could you please take down the video?

  • LouisianaBoy1990
    LouisianaBoy1990 8 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 8 месяцев назад

    u r best👍👍👍

  • Aaron Trent
    Aaron Trent 8 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 8 месяцев назад

    So moral: Excessive torque is injurious to health

  • Neal Caplan
    Neal Caplan 8 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 8 месяцев назад

    I like

  • Muhabbet Adamı
    Muhabbet Adamı 8 месяцев назад

    the end was The End

  • Eitan Sheffer
    Eitan Sheffer 8 месяцев назад

    it's r cross f

  • hAnumAn dAsAm
    hAnumAn dAsAm 8 месяцев назад

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

  • Digvijay Singh
    Digvijay Singh 8 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.