Question

define moment of inertia​

Answer 1

The moment of inertia, otherwise known as the 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

if anybody want to be rest then it continue to be rest and if body in motion tends to be in motion until or external force is not applied.this is also 1 newton law of motion

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