Chapter 6, Problem 5Q

If you press an apple crate against a wall so hard that the crate cannot slide down the wall, what is the direction of (a) the static frictional force ${\stackrel{\to }{f}}_s$ on the crate from the wall and (b) the normal force ${\stackrel{\to }{F}}_N$ on the crate from the wall? If you increase your push, what happens to (c) ƒ_s, (d) F_N, and (e) ƒ_{s, max}?