Angular momentum is the amount of motion a body has when it is rotating. It is a product of angular velocity and moment of inertia. Angular momentum is a conserved quantity. This is because it stays constant unless an external force (moment or torque) acts upon it (Newton’s First Law). The forces that act on a rotating body are air resistance and friction when there is contact with the ground.
The moment of inertia of an object can change if its shape changes.
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