Question

A body is under the action of three force $F_1,F_2$, and $F_3$. In which case the body cannot under go angular acceleration?

• A. $F_1+F_2+F_3=0$
• B. $F_1,F_2$ and $F_3$ are concurrent
• C. $F_1$, and $F_2$ act at the same point but, $F_3$ acts at different point
• D. $F_1+F_2$ is parallel to $F_3$, but the three forces are not concurrent

Answer 1

Answer: (B)

$F_1,F_2$ and $F_3$ are concurrent

Only if the three forces are concurrent, they cannot produce a net clockwise or anticlockwise momentum, which is necessary for rotation.