You can create external forces and torques for your mechanism if you have a Mechanism Dynamics license.

You can apply a force or torque to simulate external influences on the motion of a mechanism. The force or torque usually represents a dynamic interaction of your mechanism with another rigid body and can arise from a contact between parts belonging to the mechanism and entities external to the mechanism.

A force is always a push or a pull, causing objects to change their translation motion, for example, the force of your finger pushing a box causes the box to move according to the direction of the push. A torque is a turning or twisting force, such as the one applied to spin the top of a box. Forces and a torques are considered motor features and are defined in the same way motors are defined.