Chapter 6, Problem 3Q

In Fig. 6-13, horizontal force ${\stackrel{\to }{F}}_1$ of magnitude 10 N is applied to a box on a floor, but the box does not slide. Then, as the magnitude of vertical force ${\stackrel{\to }{F}}_2$ is increased from zero, do the following quantities increase, decrease, or stay the same: (a) the magnitude of the frictional force ${\stackrel{\to }{f}}_s$ on the box; (b) the magnitude of the normal force ${\stackrel{\to }{F}}_N$ on the box from the floor; (c) the maximum value ƒ_{s, max} of the magnitude of the static frictional force on the box? (d) Does the box eventually slide?

Figure 6-13 Question 3.