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

The conservation of angular momentum requires that the net torque acting on a system is zero, meaning no external torque is acting on it. Therefore, choice D is correct. While the conservation of angular momentum is a result of symmetry in physical laws, it does not necessarily hold all the time, as external torques can change the value. Therefore, choice E is not accurate. The choices A, B, and C are incorrect, as they do not directly affect the conservation of angular momentum.

The Angular Momentum of a System Remains Constant