Describe the conditions under which a system’s angular velocity changes.

Angular velocity changes when the net torque exerted on the object or system is not equal to zero.

The rate at which the angular velocity of a rigid system changes is directly proportional to the net torque exerted on the rigid system and is in the same direction. The angular acceleration of the rigid system is inversely proportional to the rotational inertia of the rigid system. Relevant equation:

To fully describe a rotating rigid system, linear and rotational analyses may need to be performed independently