Biomechanics Terminology for the Modern Podiatrist: Rotational Equilibrium In this 16-minute lecture, I review the important concepts of rotational and translational equilibrium. Equilibrium can only occur when the forces and moments are balanced on an object and the object is either translating or rotating at a constant velocity. In the case of the foot and lower extremity, if the foot is at rest, and not moving or translating, then it can be assumed to be in both translational equilibrium and

Basic Biomechanics Terminology and Concepts: Moments This is my second lecture on biomechanics terminology covering the subject of rotational forces, or moments. Moments can be either external, generated by external forces acting on the foot, such as ground reaction force, or internal moments, generated by muscle, tendon, ligament or fascial tension forces. Moments can either accelerate rotation (i.e. angular acceleration) in the direction of the moment, or decelerate rotation in the direction o