ABSTRACT
The application of a force acting through a perpendicular distance in this manner is called a moment and is sometimes referred to as a torque. Torque is a vector quantity. The magnitude of the accelerating moment, or torque, is:
When the disk rotates under the action of an
accelerating moment, it acquires angular acceleration. As in all our problems on dynamics, we introduce an inertia force, or in this case, an inertia moment, to act in the opposite sense to the accelerating moment. This allows rotational dynamics problems to be treated using equations of equilibrium.
