Question

The conservation of angular momentum demands that ?the external torque on the system must be zero,the external force on the system is zero

Answer 1

The law of conservation of angular momentum states that when no external torque acts on an object, no change of angular momentum will occur.

• If the net torque is zero, then angular momentum is constant or conserved.
• Just like linear momentum is conserved when there is no net external forces, angular momentum is constant or conserved when the net torque is zero.
• Example of angular momentum conservation is: angular acceleration of an ice skater when she brings her arms and legs close to the vertical axis of rotation.