Moments, levers and gears

Easy

Figure 1 shows a circular disk that is free to rotate about a fixed axle at its center.

Four forces, $F_A$ , $F_B$ , $F_C$ , and $F_D$ , act on the disk as shown.

$Diagram of a circular disk with forces F_A, F_B, F_C, and F_D\, acting at different points.$

Which force will cause the disk to rotate about its axle?

$F_A$

$F_B$

$F_C$

$F_D$

Moments, levers and gears Questions