Counter Intuitive Celts PDF

A plastic rattleback is spun counterclockwise on a hard surface and it spins and spins and spins. When it is spun clockwise on the same surface, with the same amount of emery, it spins for a bit, rattles back and forth, and then reverses direction. No magic necessary, just a little bit of torque. Teaches potential and kinetic energy, torque, momentum, and friction.

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