Couple

A couple is a pair of parallel forces equal in magnitude but in opposite directions. The forces are separated by a perpendicular distance, known as the couple's arm. The couple causes a rotation force or moment that rotates the body about an axis perpendicular to the plane of the forces. The resulting moment is referred to as the couple moment. ...

A couple is a pair of parallel forces having equal magnitudes but acting in opposite directions, separated by a perpendicular distance.

The couple causes a rotation force that rotates the body about an axis perpendicular to the plane of the forces, and the resulting moment is known as the couple moment.

Consider tightening a bolt w...