**Goal:** Hone the concept of conservative force

**Source:** UMPERG-ctqpe67

The

potential energy function for a certain body is shown at right. The

force associated with this potential is …

- conservative.
- dissipative.
- neither conservative or dissipative.
- Cannot be determined

## Commentary:

## Answer

(1) It is remarkable how many students will select one of the

other answers. Many students do not recognize that you cannot have a

potential function unless the force is conservative.