When is the angular momentum of a system constant?
A)Only when its total kinetic energy is constant.
B)Only when no net external force acts on the system.
C)Only when the linear momentum and the energy are constant.
D)Only when no net external torque acts on the system.
E)Only when the moment of inertia is constant.

Question

Quizplus · Accepted Answer

Angular momentum of a system is conserved (constant) only when there is no net external torque acting on the system. This is known as the law of conservation of angular momentum.

When Is the Angular Momentum of a System Constant