Question

explain the moment of inertia in rotatory motion

Answer 1

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.The moment of inertia, otherwise known as the mass moment of inertia, angular mass or rotational inertia, of a rigid body is a quantity that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration. 

Answer 2

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Moment of inertia is a measure of how difficult it is to rotate a given body about a given axis.

Significance:

Greater the mass concentrated away from the axis,greater the moment of inertia. Moment of inertia is the property of body due to which it opposes the change in state in rotatory motion.