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

Комментарии: 2 134

  • Rks Mehul
    Rks Mehul 16 часов назад

    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 3 дня 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 3 дня назад


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

    Nice video dude...

  • Vishnu Sagar
    Vishnu Sagar 12 дней назад

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

  • Lydia Jasmine
    Lydia Jasmine 12 дней назад

    Correction 1:15 torque =R×F

  • Abhishek Sarkar
    Abhishek Sarkar 13 дней назад

    awesome dude!

  • Verain_the_great
    Verain_the_great 13 дней назад

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

  • Chandan Sharma
    Chandan Sharma 18 дней назад

    Completely visualized

  • navikesh doddi
    navikesh doddi 19 дней 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 28 дней назад


  • Raisa Rasul
    Raisa Rasul 28 дней назад

    Thank you so much! This helps alot!

  • william osorio
    william osorio 28 дней назад

    Hey is me!! Really

  • physics physics
    physics physics 29 дней назад

    Could you please take down the video?

  • LouisianaBoy1990
    LouisianaBoy1990 Месяц 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 Месяц назад

    u r best👍👍👍

  • Aaron Trent
    Aaron Trent Месяц 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 Месяц назад

    So moral: Excessive torque is injurious to health

  • Neal Caplan
    Neal Caplan Месяц 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 Месяц назад

    I like

  • Muhabbet Adamı
    Muhabbet Adamı Месяц назад

    the end was The End

  • Eitan Sheffer
    Eitan Sheffer Месяц назад

    it's r cross f

  • hanuman dasam
    hanuman dasam Месяц назад

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

  • digvijay Singh
    digvijay Singh Месяц 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 Месяц назад

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

  • Adhyan Ravel
    Adhyan Ravel Месяц назад


  • Rhey Jen Crusem
    Rhey Jen Crusem Месяц назад

    the ending gives me reflex.

  • namelessone
    namelessone Месяц 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 Месяц 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 2 месяца назад

    total waste time wast

  • Syed Waqas Haider
    Syed Waqas Haider 2 месяца назад

    torque = r x F and not F x r

  • Vista Panoramica by Lello
    Vista Panoramica by Lello 2 месяца назад +1

    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?!?

  • mahmud shawon
    mahmud shawon 2 месяца назад

    Thank u , really learnt from you

  • oosveluzo levso
    oosveluzo levso 2 месяца назад

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

  • TomVinova
    TomVinova 2 месяца назад

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

  • naveen reddi
    naveen reddi 2 месяца назад

    Nailed it bro

  • Brian Skinner
    Brian Skinner 2 месяца 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 2 месяца назад

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

  • Rumman Muhammad
    Rumman Muhammad 2 месяца назад

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

  • The Mastermind
    The Mastermind 2 месяца назад

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

  • Jsux23 G
    Jsux23 G 3 месяца назад


  • Abhay Bhardwaj
    Abhay Bhardwaj 3 месяца назад

    vsauce "spinning" anyone?

  • Max Lake
    Max Lake 3 месяца назад

    torque vector of a black hole is the same.

  • scRam Jet
    scRam Jet 3 месяца 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 3 месяца назад

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

  • noonesperfect
    noonesperfect 3 месяца назад

    this is an awesome video....

  • 4one14
    4one14 3 месяца назад

    Physics makes me smile :)

  • zenapsgas
    zenapsgas 3 месяца назад

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

  • Frederick Stuart
    Frederick Stuart 4 месяца назад

    I almost got it

  • Hemanth Alluri
    Hemanth Alluri 4 месяца назад

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

  • Andrej Michalica
    Andrej Michalica 4 месяца назад

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

  • re frigerator
    re frigerator 4 месяца назад

    not scared just laughing

  • Subarna Subedi
    Subarna Subedi 4 месяца назад

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

  • Jijo Paul
    Jijo Paul 4 месяца 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 4 месяца назад

    Fidget spinners brought me here. Kill me.

  • Pichael Moon
    Pichael Moon 4 месяца 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 4 месяца назад


  • heystirke300
    heystirke300 4 месяца назад

    i m mind fucked

  • DevinDTV
    DevinDTV 4 месяца 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 4 месяца назад

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

  • Myfavsandlikes
    Myfavsandlikes 5 месяцев назад

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

  • Myfavsandlikes
    Myfavsandlikes 5 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 5 месяцев назад

    This is how a single gimbal CMG works, right?

  • vogonford
    vogonford 5 месяцев назад

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

  • Booster 884
    Booster 884 5 месяцев назад

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

  • Martin S
    Martin S 5 месяцев назад +1

    He should've used Zipp 808 firecrest wheels

  • Arnav Sharma
    Arnav Sharma 5 месяцев назад

    which country are you from

  • Vishnu M Aiea
    Vishnu M Aiea 5 месяцев 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 5 месяцев назад

    Almost got a heart attack from that ending xD

  • Luis M. Diaz Angulo
    Luis M. Diaz Angulo 5 месяцев 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 5 месяцев назад

    but did you die!?

  • Money Editor
    Money Editor 5 месяцев 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 5 месяцев назад

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

  • koushik sriram
    koushik sriram 5 месяцев назад

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

  • mluleki mabuza
    mluleki mabuza 5 месяцев назад

    that scared me, man!

  • MoosT
    MoosT 6 месяцев назад +1

    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 5 месяцев назад +1

      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 6 месяцев назад

    42.0 blaze it

  • 파양
    파양 6 месяцев назад +1

    wow i think that is best the best!!!

  • Rumman Muhammad
    Rumman Muhammad 6 месяцев назад


  • Rumman Muhammad
    Rumman Muhammad 6 месяцев назад

    too good, very well presented, dear sir..

  • Man In The Sky
    Man In The Sky 6 месяцев 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 6 месяцев назад

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

  • Ashok Shrestha
    Ashok Shrestha 6 месяцев назад

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

  • RubikMaster13
    RubikMaster13 6 месяцев 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 6 месяцев назад

    That ending tho!

  • suresh nam
    suresh nam 6 месяцев назад

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

  • Super Miner Bilal
    Super Miner Bilal 6 месяцев назад

    roblox death sound in the end lol

  • Super Miner Bilal
    Super Miner Bilal 6 месяцев назад

    might do my science project on this

  • Nugacity TM
    Nugacity TM 7 месяцев назад

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

  • Hogan Knott
    Hogan Knott 7 месяцев назад

    r cross f, not f times r.

  • PieZello
    PieZello 7 месяцев назад

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

  • Anime world
    Anime world 7 месяцев назад

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

    by putting a gyroscopic wheel between diamagnetic plates?

  • AMVaddictionist
    AMVaddictionist 7 месяцев назад

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

  • atari7001
    atari7001 7 месяцев 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 7 месяцев 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 8 месяцев назад +1

    1080p in 2012. I'm impressed

  • Fk Kwan
    Fk Kwan 8 месяцев назад

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

  • kightremin
    kightremin 8 месяцев назад

    That hurts...

  • Joe Deglman
    Joe Deglman 8 месяцев 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.