Chapter 10, Problem 5Q

In Fig. 10-23, two forces ${\stackrel{\to }{F}}_1$ and ${\stackrel{\to }{F}}_2$ act on a disk that turns about its center like a merry-go-round. The forces maintain the indicated angles during the rotation, which is counterclockwise and at a constant rate. However, we are to decrease the angle θ of ${\stackrel{\to }{F}}_1$ without changing the magnitude of ${\stackrel{\to }{F}}_1$. (a) To keep the angular speed constant, should we increase, decrease, or maintain the magnitude of ${\stackrel{\to }{F}}_2$? Do forces (b) ${\stackrel{\to }{F}}_1$ and (c) ${\stackrel{\to }{F}}_2$ tend to rotate the disk clockwise or counterclockwise?

Figure 10-23 Question 5.