Torque and Force Couples

Torque is a measure of the rotatory strength with which a segment moves. For torque to be acting at any segment, we need two forces that have are equal in magnitude but opposite in direction. This concept is applied to the human body in the understanding of force couples. Torque is also called as a moment of force and is expressed as

Torque= Magnitude of force * Perpendicular distance between the 2 forces

It is expressed in the direction in which it acts. For instance, a force in the clockwise direction is given a -sign, a force in the counterclockwise direction is given a +sign. It is also expressed in the motion which occurs. The moment that occurs in

It is also called a moment of force and is expressed with the force name for instance a torque in the flexion motion is a flexion torque or moment. Likewise, a torque acting in the extension direction is called an extension torque or an extension moment.