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Rotating Stool And Weights
Purpose
To demonstrate conservation of angular momentum.
Equipment
Rotating stool with weights.
Suggestions
BE CAREFUL. A subject can easily be rotated off the stool.
Images
Description
A subject sits on the stool, with his or her arms extended, holding the weights. After the system is set into rotation, the subject pulls the weights in to his or her chest, decreasing the moment of inertia of the system and thus increasing the angular speed of the system.
References
H.W. Dosso, R. H. Vidal, Simple Apparatus for Angular Motion Demonstrations, AJP 30, 528-529, (1962).