1Q40.10 Rotation of Stool and Weights

Spin on a rotating stool with a weight in each hand. Move arms in and out to see how speed changes. The rotation rate changes as the moment of inertia changes. Compare to what happens to ice skaters when move arms in and out.

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Setup Requirements: Off the shelf. Choice of 3, 5 or 8 lb wts.

Equations: Angular momentum is conserved. As r decreases spin rate increases. L = I x spin rate. I proportional to r2.

 

 

Safety Issues: Possible Dizziness. Sit on the center of the stool. Avoid dropping weights on foot.