ABSTRACT
The turning moment of a couple is called a torque, T. In Figure 10.1, torque = magnitude of either force × perpendicular distance between the forces,
i.e.T = Fd
Figure 10.1
The unit of torque is the newton metre, N m When a force F newtons is applied at a radius r metres from the axis of, say, a nut to be turned by a spanner, as shown in Figure 10.2, the torque T applied to the nut is given by:
T = Fr N m
Figure 10.2
Problem 1. Determine the torque when a pulley wheel of diameter 300 mm has a force of 80 N applied at the rim.
