Chapter 12, Problem 12A

Momentum is conserved when there is no net external force. When is angular momentum conserved?

To determine

The condition when the angular momentum of a system is conserved.

Answer to Problem 12A

In case of no external torque

Explanation of Solution

Introduction:

When there is no net external force on the considered system, then the momentum of the system remains conserved.

Similarly, when no external torque is exerted on a considered rotational system, then the angular momentum of the system remains conserved.

Conclusion:

Hence, the angular momentum remains same conserved in case of no external torque.