Moment of a Force and Couple: Moment of a Force: A body is said to be perfectly rigid if the distance between any two particles in it remains constant. It does not suffer any change in its shape on the application of force. Since all the bodies yield more or less to the action of forces, nobody is, therefore, perfectly rigid. The effect of a force on a rigid body depends on the magnitude of the force and its line of action (the straight line along which the force acts). The force acting on a rigid body may produce a … Continue reading Moment of a Force and Couple