Example 10.2 What is the mass of a block of metal that weighs 29 lb?
Mass = 29/32.2 = 0.9 lb (slug)
Torque occurs when a force acting on a body tends to cause the body to rotate
and is defined by the magnitude of the force times the perpendicular distance
from the line of action of the force to the center of rotation (see Fig. 10.4a).
Units of torque are pounds (lb), feet (ft), or newton meter (N⋅m). Torque is sometimes
referred to as the moment of the force, and is given by
Torque (t) = F × d (10.3)
A couple occurs when two parallel forces of equal amplitude, but in opposite
directions, are acting on an object to cause rotation, as shown in Fig. 10.4b and
is given by the following equation:
Couple (c) = F × d (10.4)