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Answer: Momet of Inertia
What is Moment of inertia?
--moment of inertia, quantitative measure of the rotational inertia of a body—i.e., the opposition that the body exhibits to having its speed of rotation about an axis altered by the application of a torque.
--The axis may be internal or external and may or may not be fixed.
--When a rigid, extended body is rotated, its resistance to a change in its state of rotation is called its rotational inertia, or moment of inertia.
Rod
--The moment of inertia about the end of the rod can be calculated directly or obtained from the center of mass expression by use of the Parallel axis theorem.
Moment of inertia of Rod =1/12Ml^2
Disc.
Moment of Inertia of Disc =1/2MR^2
It is because of an disk's moment of inertia that it can store rotational energy in this way.
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