ABSTRACT
At the end of this chapter you should be able to: • define a couple • define a torque and state its unit • calculate torque given force and radius • calculate work done given torque and
angle turned through • calculate power, given torque and angle
turned through
• appreciate kinetic energy = Iω 2
2 where I
is the moment of inertia • appreciate that torque T = Iα where α is
the angular acceleration • calculate torque given I and α • calculate kinetic energy given I and ω • understand power transmission by means
of belt and pulley • perform calculations involving torque,
power and efficiency of belt drives
When two equal forces act on a body as shown in Figure 9.1, they cause the body to rotate, and the system of forces is called a couple.
