define rigid body, axis of rotation and moment of inertia
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Rigid Body: When an external force acts
on a body and the distance between the two points on the body doesn't change, then the body is known as a rigid body.
Axis of Rotation: the straight line through
all fixed points of a rotating rigid body around which all other points of the body move in circles.
Moment of Inertia: (see the attached image)
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