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

Комментарии • 2 175

  • viral ashra
    viral ashra 2 дня назад

    helped a lot , tjanks!

  • Timothy Morris
    Timothy Morris 6 дней назад

    Simple physics most should know but don't.

  • Saurabh Shukla
    Saurabh Shukla 7 дней 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 10 дней назад

    A very helpful video. Thank You

  • Veni Vidi Amavi
    Veni Vidi Amavi 17 дней назад

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

  • Veni Vidi Amavi
    Veni Vidi Amavi 17 дней 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 18 дней назад

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

  • Rishi Katta
    Rishi Katta 29 дней назад

    Torque vector = radius vector cross product force vector.

  • Cihad
    Cihad Месяц назад +1

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

  • Muhammad Irfan Noor Azman
    Muhammad Irfan Noor Azman Месяц назад +1

    That ending scared me

  • Sagnik Saha
    Sagnik Saha Месяц назад +1

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

  • G-man Moto vlog
    G-man Moto vlog Месяц назад +1

    uhhh..nicely done

  • LayTzz_swe HD
    LayTzz_swe HD Месяц 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 Месяц 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 Месяц 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 Месяц 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 Месяц назад +1

    thank you for the vedio

  • Mark Brazier
    Mark Brazier Месяц 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 2 месяца назад +1

    I crapped my pants in the end.

  • Jon Saw
    Jon Saw 2 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.

  • Talk To Expertzzz Mansuri
    Talk To Expertzzz Mansuri 2 месяца назад +1


  • Gregory Macchio
    Gregory Macchio 2 месяца назад +1

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

  • David Harrington
    David Harrington 2 месяца назад +1

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

  • Josué Barrientos
    Josué Barrientos 2 месяца назад

    Of you want a real explanation look the Mathias Wandel video

  • Soumyadip Poddar
    Soumyadip Poddar 2 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 2 месяца назад +1

    Torque=r cross force. Not force cross r

  • abolilakhe
    abolilakhe 2 месяца назад +1

    So cool!

  • Shreeya 200
    Shreeya 200 2 месяца назад +1

    He's cute and he explains well❣️

  • 刘炯
    刘炯 2 месяца назад +1

    So that means the correct answer is Less Than?

  • chitresh apte
    chitresh apte 2 месяца назад +1

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

  • Sean Karl
    Sean Karl 2 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 2 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 2 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 2 месяца назад


  • 3D M's Creation
    3D M's Creation 3 месяца назад

    Nice video dude...

  • Vishnu Sagar
    Vishnu Sagar 3 месяца назад

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

  • Lydia Jasmine
    Lydia Jasmine 3 месяца назад

    Correction 1:15 torque =R×F

  • Abhishek Sarkar
    Abhishek Sarkar 3 месяца назад

    awesome dude!

  • Verain_the_great
    Verain_the_great 3 месяца назад

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

  • Chandan Sharma
    Chandan Sharma 3 месяца назад

    Completely visualized

  • navikesh doddi
    navikesh doddi 3 месяца 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 3 месяца назад


  • Raisa Rasul
    Raisa Rasul 3 месяца назад

    Thank you so much! This helps alot!

  • william osorio
    william osorio 3 месяца назад

    Hey is me!! Really

  • physics physics
    physics physics 3 месяца назад

    Could you please take down the video?

  • LouisianaBoy1990
    LouisianaBoy1990 3 месяца 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 3 месяца назад

    u r best👍👍👍

  • Aaron Trent
    Aaron Trent 3 месяца 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 3 месяца назад

    So moral: Excessive torque is injurious to health

  • Neal Caplan
    Neal Caplan 3 месяца 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 3 месяца назад

    I like

  • Muhabbet Adamı
    Muhabbet Adamı 4 месяца назад

    the end was The End

  • Eitan Sheffer
    Eitan Sheffer 4 месяца назад

    it's r cross f

  • hanuman dasam
    hanuman dasam 4 месяца назад

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

  • digvijay Singh
    digvijay Singh 4 месяца 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 4 месяца назад

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

  • Addhyan Milan Ravel
    Addhyan Milan Ravel 4 месяца назад


  • Rhey Jen Crusem
    Rhey Jen Crusem 4 месяца назад

    the ending gives me reflex.

  • namelessone
    namelessone 4 месяца 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 4 месяца 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 4 месяца назад

    total waste time wast

  • Syed Waqas Haider
    Syed Waqas Haider 5 месяцев назад

    torque = r x F and not F x r

  • Vista Panoramica by Lello
    Vista Panoramica by Lello 5 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 12 дней назад

      Thanks Marek... thanks a lot!!!

    • Marek Ważyński
      Marek Ważyński 12 дней 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 2 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 3 месяца назад

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

    • Claudius Pereira
      Claudius Pereira 3 месяца назад

      42 everyone knows that

  • mahmud shawon
    mahmud shawon 5 месяцев назад

    Thank u , really learnt from you

  • oosveluzo levso
    oosveluzo levso 5 месяцев назад

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

  • TheImpetus
    TheImpetus 5 месяцев назад

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

  • naveen reddi
    naveen reddi 5 месяцев назад

    Nailed it bro

  • Brian Skinner
    Brian Skinner 5 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 5 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 5 месяцев назад

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

  • The Mastermind
    The Mastermind 5 месяцев назад

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

  • Jsux23 G
    Jsux23 G 5 месяцев назад


  • Abhay Bhardwaj
    Abhay Bhardwaj 6 месяцев назад

    vsauce "spinning" anyone?

  • Max Lake
    Max Lake 6 месяцев назад

    torque vector of a black hole is the same.

  • scRam Jet
    scRam Jet 6 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 6 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 Месяц назад

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

  • noonesperfect
    noonesperfect 6 месяцев назад

    this is an awesome video....

  • 4one14
    4one14 6 месяцев назад

    Physics makes me smile :)

  • zenapsgas
    zenapsgas 6 месяцев назад

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

  • Frederick Stuart
    Frederick Stuart 7 месяцев назад

    I almost got it

  • Hemanth Alluri
    Hemanth Alluri 7 месяцев назад

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

  • Andrej Michalica
    Andrej Michalica 7 месяцев назад

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

  • re frigerator
    re frigerator 7 месяцев назад

    not scared just laughing

  • Subarna Subedi
    Subarna Subedi 7 месяцев назад

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

  • Jijo Paul
    Jijo Paul 7 месяцев 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 7 месяцев назад

    Fidget spinners brought me here. Kill me.

  • Pichael Moon
    Pichael Moon 7 месяцев 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 7 месяцев назад


  • heystirke300
    heystirke300 7 месяцев назад

    i m mind fucked

  • DevinDTV
    DevinDTV 7 месяцев 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 7 месяцев назад

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

  • Myfavsandlikes
    Myfavsandlikes 8 месяцев назад

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

  • Myfavsandlikes
    Myfavsandlikes 8 месяцев 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 8 месяцев назад

    This is how a single gimbal CMG works, right?

  • vogonford
    vogonford 8 месяцев назад

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

  • Booster 884
    Booster 884 8 месяцев назад

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

  • Martin S
    Martin S 8 месяцев назад +1

    He should've used Zipp 808 firecrest wheels

  • Arnav Sharma
    Arnav Sharma 8 месяцев назад

    which country are you from