A rotational force generates three orthogonal torques about the reference marker. This force applies action torques to the action body, and the corresponding reaction torques are applied to the base body. The position and orientation of base marker are not used because the direction of force is defined by the reference marker. It is used when it is convenient to work with the three orthogonal torque components or when the direction of the torque is different than about a rotational axis.
Figure 1 Rotation icon of the Force group in the Professional tab