Question

define rigid body, axis of rotation and moment of inertia​

Answer 1

Answer:

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)