Question

What do you understand by the following terms? 

(i) couple, (ii) arm of couple, (iii) moment of couple

Answer 1

1. Couple : “Two forces acting on a rigid body are equal in magnitude opposite parallel and not along the same straight line constitute a couple.” 

2. Arm of the couple : “Perpendicular distance between two forces is called arm of the couple.” i.e. AB is arm of couple. 

3. Moment of the couple : “Is the product of any one of the force and the arm of couple. i.e. F × AB is moment of couple.