Moment of a Couple Force Direction Zero Torque Conditions Torque of Concurrent Forces Vector Nature of Torque Perpendicular Distance Anticlockwise Moment Moment of a Force Moment Equilibrium Torque Line of Action Moment Arm Torque Equilibrium Right-Hand Rule Torque Definition Principle of Moments Parallel Force Component Scalar Torque SI Unit of Torque Torque of Coplanar Forces Dimensional Formula Moment about an Axis Reference Point Torque of Parallel Forces Resultant Torque