Help me A spinning blue plastic object made me sleepless.

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The discussion centers around a spinning blue plastic object observed in a MIT physics lecture, which appears to spin in reverse after stopping. Participants identify this object as a rattleback, a toy known for its unique behavior due to its asymmetrical shape. The rattleback's motion is explained as a result of its design, which allows it to reverse direction when spun. A link to a commercial source for purchasing rattlebacks is also provided. The phenomenon is clarified as a well-understood physical principle rather than a mystery.
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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
WHY?
 
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That is weird.
 


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.
 


MATLABdude said:
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.

Thank you! That's it.Rattleback.
 

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