ABSTRACT
This chapter aims to define a couple and a torque; and shows how the energy and work done can be calculated from the terms. It describes the expression which relates torque to the product of mass moment of inertia and the angular acceleration. The chapter presents a torque and state its unit and examines torque given force and radius and also aims to understand power transmission by means of belt and pulley and explores calculations involving torque, power and efficiency of belt drives. For a belt to transmit power between two pulleys there must be a difference in tensions in the belt on either side of the driving and driven pulleys. If the driver pulley wheel is on the shaft of an electric motor running at 700 rev/min and the power input to the motor is 5 kW, determine the efficiency of the motor.
