A lever such as that shown in Fig. 7 20 can be used to lift objects we might not otherwise be able..

A lever such as that shown in Fig. 7 20 can
be used to lift objects we might not otherwise be able to lift. Show that the
ratio of output force, Fo, to input force, F1, is related to the
lengths  and  from the pivot by Fo/ F1 = / . Ignore friction and the mass of the lever, and assume the work
output equals work input.

FIGURE 7-20