DEFINITION OF COUPLE DEFINITION OF COUPLE A couple is defined as two parallel forces of the same magnitude acting in opposite direction and separated by a constant distance. A moment of a couple (also called free vector) or a couple moment has a constant direction and magnitude regardless of the location of the positions of the forces to the reference point F-F Resultant force of a couple = 0
Two forces each of magnitude 1 0 N act vertically upwards and downwards respectively at the two ends of a uniform rod of length 4 m which is pivoted at its mid point as shown in Fig. Determine the magnitude of resultant moment of forces about the pivot O.