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moment of inertia - the tendency of a body to resist angular acceleration. inertia - (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force. moment - a turning force produced by an object acting at a distance (or a measure of that force)
For a point-like mass, the moment of inertia about some axis is given by d 2 m, where d is the distance to the axis, and m is the mass. For an extended body, the moment of inertia is just the sum of all the small pieces of mass multiplied by the square of their distances from the axis in question.hen a body is rotating, or free to rotate, around an axis, a torque must be applied to change its angular momentum. The amount of torque needed for any given rate of change in angular momentum is proportional to the moment of inertia of the body.