Analyze the Angular Momentum of a system.
I. Angular momentum is defined as the moment of linear momentum (L = r × p).
II. For a rigid body rotating about a fixed axis, L = Iω is the component of angular momentum along the axis.
III. The rate of change of angular momentum is equal to the net external torque acting on the system.
IV. If the net external torque is zero, the total angular momentum of the system is conserved.
V. Angular momentum is conserved only if the net external force is zero.
