Conservation of angular momentum: The angular momentum of a system remains constant
A) when the total kinetic energy is constant.
B) when no net external force acts on the system.
C) when the linear momentum and the energy are constant.
D) when no torque acts on the system.
E) all the time since it is a conserved quantity.

Question

Quizplus · Accepted Answer

Conservation of angular momentum is only valid when no net external torque acts on the system. It is independent of the linear momentum and energy of the system, so choices A and C are incorrect. While it is a conserved quantity, choice E is too general and not specific to the conditions required for conservation.

Conservation of Angular Momentum: the Angular Momentum of a System