Moment of inertia can be regarded as a measure of rotational inertia. Why?
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Moment of inertia aka angular mass or rotational inertia can be defined w.r.t. rotation axis, as a quantity that decides the amount of torque required for a desired angular acceleration or a property of a body due to which it resists angular acceleration.
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Moment of inertia is a measure of inertia of the body when the body is rotating about an axis.
It is found by summation of mass * square of radius of gyration for all particles in the object.
Moment of inertia plays a part ,similar to mass in linear kinetics, in rotaional dynamics.
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