Chapter 6, Problem 7PCE

The three identical boxes shown in Figure 6-33 remain at rest on a rough, horizontal surface, even though they are acted on by two different forces, ${\stackrel{\to }{\text{F}}}_1$ and ${\stackrel{\to }{\text{F}}}_2$ All of the forces labeled ${\stackrel{\to }{\text{F}}}_1$ have the same magnitude; all of the forces labeled ${\stackrel{\to }{\text{F}}}_2$ are identical to one another. Rank the boxes in order of increasing magnitude of the force of static friction between them and the surface. Indicate ties where appropriate.