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Help me A spinning blue plastic object made me sleepless.

  1. May 23, 2009 #1
    Help me!!A spinning blue plastic object made me sleepless.

    I've seen the mit online vedio course Physics I: Classical Mechanics Lecture 21 Torques, Oscillating Bodies,near the end 44:19.There is a spinning blue plastic object,the teacher spun it, it revolved then it stoped,then it revolved reversely without any other force!
    link:http://ocw.mit.edu/OcwWeb/Physics/8-01Physics-IFall1999/VideoLectures/detail/embed21.htm [Broken]
    WHY???
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 23, 2009 #2
    Re: Help me!!A spinning blue plastic object made me sleepless.

    That is weird.
     
  4. May 23, 2009 #3

    MATLABdude

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    Science Advisor

    Re: Help me!!A spinning blue plastic object made me sleepless.

    Haven't seen the video, but it sounds like a rattleback:
    http://en.wikipedia.org/wiki/Rattleback

    Nifty little toy. However, nothing really mysterious about it.
     
  5. May 23, 2009 #4
    Re: Help me!!A spinning blue plastic object made me sleepless.

    Thank you! That's it.Rattleback.
     
  6. May 23, 2009 #5
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