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 spinning motion of an object will not change unless an external force is applied.
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Torque is the rotational equivalent of force and causes objects to rotate around an axis. It is calculated by multiplying the force applied to an object by its lever arm.
The moment of inertia measures how resistant an object is to changes in its rotational motion. It depends on both the mass distribution and shape of the object.
Angular velocity refers to how fast an object rotates around an axis. It is measured in radians per second and can be calculated by dividing the angle through which an object rotates by the time taken for that rotation.