Chapter 6, Problem 64PQ

A box rests on a surface (Fig. P6.64). A force ${\stackrel{\to }{F}}_{\text{app}}$ is applied to the box in two different ways. In both cases. ${\stackrel{\to }{F}}_{\text{app}}$ has the same magnitude, but in case 1 the force is directed below the horizontal, whereas in case 2 it is directed above the horizontal.

a. Draw a free-body diagram for both cases.

b. Now F_app is increased in both cases until the box just barely remains at rest. Compare F_{s, max} for each free-body diagram.

c. Use your answer to part (b) to find a best way to move a heavy desk. Describe and explain your solution.