Moments, levers and gears

Easy

A thin, uniform square plate $OABC\,$ is free to rotate in a vertical plane about a smooth fixed hinge at its bottom-left corner $O$ .

Four forces, $F_1$ , $F_2$ , $F_3$ , and $F_4$ , act on the plate as shown.

A square plate OABC pivoted at O, with forces F1, F2, F3 pointing towards the pivot O and F4 pointing horizontally to the right.

Which force will cause the plate to rotate about the hinge $O$ ?

$F_1$

$F_2$

$F_3$

$F_4$

Moments, levers and gears Questions