Answer to Question #181228 in Physics for Lester gelardo

Question

The given blocks have weights WA = 20KN, WB = 40 KN, WC = 60KN, respectively. Coefficients of static friction at the surfaces of contact are shown in the figure. Determine: a) Smallest horizontal force P needed to move block A. (in KN)

Answer 1

If the surface is horizontal and the coefficient of static friction between block A and the surface is $\mu_A$, the smallest horizontal force is

$$P=\mu_A W_A.$$