Chapter 6, Problem 35P

ILW The two blocks (m = 16 kg and M = 88 kg) in Fig. 6-38 are not attached to each other. The coefficient of static friction between the blocks is µ_s = 0.38, but the surface beneath the larger block is friction-less. What is the minimum magnitude of the horizontal force $\stackrel{\to }{F}$ required to keep the smaller block from slipping down the larger block?

Figure 6-38 Problem 35.