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A tag for questions about the mechanical interactions of rotating objects, including torque and angular momentum.

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Proof that the Earth rotates?

Foucault pendulum. I don't know how the ancients did it, but it is surely pure classical mechanics. The animation describes the motion of a Foucault Pendulum at a latitude of 30°N.
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How to design a deliberately biased coin?

Maybe this answer won't be useful to you at all, but still. Since you mentioned that all this is for a demostration, you might as well use a loaded dice than put in all the effort to make an unbiase …
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