**Goal:** Hone the concept of torque

**Source:** UMPERG-ctqpe131

Which of the following statements is true about this situation?

- There are no points having zero total torque.
- There is one point having zero total torque.
- There are many points having zero total torque.

## Commentary:

## Answer

(3) Many students realize that there is at least one point, the

intersection of the lines of action of the two forces, having zero

torque. A drawing is usually sufficient to convince students that there

is an entire line along which the torque is zero.