The conservation of angular momentum states that the total angular momentum of a system remains constant if no external torques act on it. In other words, the rotational motion of an object will not change unless an external torque is applied.
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Angular momentum: Angular momentum is a measure of how fast an object is rotating and how spread out its mass is from the axis of rotation.
Moment of inertia: Moment of inertia refers to an object's resistance to changes in its rotational motion and depends on both the mass distribution and shape of the object.