Reversing Spin: What's Behind the Physics Phenomenon?

AI Thread Summary
The discussion centers on the phenomenon of a Rattleback, a plastic object that spins, stops, and then reverses direction. Participants express confusion about the physics behind this behavior, particularly why it doesn't simply come to a stop. The Rattleback's unique shape and distribution of mass contribute to its ability to reverse spin due to its interaction with the surface it spins on. Resources are shared to explain the underlying physics, emphasizing the importance of angular momentum and stability. Understanding the mechanics of the Rattleback can clarify this intriguing phenomenon.
diegocas
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At the end of this class http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/embed21/, Prof. Walter Lewin spins a plastic object on the table. The object starts spinning, it stops and immediately starts spinning in the opposite direction. The question is why? Why doesn't it just stop? The question is left unanswered and I could not come up with any reasonable idea. Can anyone give me a hint? I'm really puzzled by this!
Thanks!
 
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