In rotatory motion, angular momentum plays a role which is analogous to that played by _ in linear motion.

Explanation

The rotational momentum and "linear momentum both form the same function in a body, they are responsible for keeping the body moving in the direction it is moving, and both quantity the amount of motion (translational tor linear momentum and rotational tor angular momentum) present in the body. Moment of inertia in an analogue to mass in rotational motion. If we want to feel inertia in linear motion we examine the linear acceleration of mass produced by a given force. If acceleration for a given force is more we say that the body has less inertia. If the same force produces less acceleration in another mass then the inertia of the second body for linear motion is large compared to the first body. The expression for this fact is F/m=a. So, mass is the measure of inertia to linear motion.