PURPOSE: To illustrate the motion of the center of mass of an irregularly-shaped object.
DESCRIPTION: The center of mass of the plumber's helper is located by a bright orange tape. When the object is thrown through the air with some rotation, the center of mass moves in a smooth parabolic arc.
SUGGESTIONS:
EQUIPMENT: Plumber's helper with marked center of mass, as photographed.
SETUP TIME: None.
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