Question

moment of inertia about an axis

Answer 1

Moment of inertia plays the role in rotational kinetics that mass (inertia) plays in linear kinetics - both characterize the resistance of a body to changes in its motion. The moment of inertia depends on how mass is distributed around an axis of rotation, and will vary depending on the chosen axis

Answer 2

Themoment of inertia of a point mass with respect to an axis is defined as the product of the mass times the distance from the axis squared.