**Goal:** Reason regarding interactions

**Source:** CT151.2S02-43

A

cart of mass 2m collides and sticks to a cart of mass m that is

initially at rest. Which cart exerts the larger force on the other?

- m
- 2m
- Both exert the same force
- Cannot be determined

**Goal:** Reason regarding interactions

**Source:** CT151.2S02-43

A

cart of mass 2m collides and sticks to a cart of mass m that is

initially at rest. Which cart exerts the larger force on the other?

- m
- 2m
- Both exert the same force
- Cannot be determined

## Commentary:

## Answer

(3) Yet another instance of Newton’s Third Law. Some students still

stumble because they the question considers the object exerting the

larger force as opposed to the one having the larger force applied to

it.