Item FM090002: A wagon that is being pulled with a constant force can move faster than the person pulling it if the force of the pull is greater than the force of friction on the wagon.

A girl is pulling a wagon on level ground. She is running at constant speed and pulling on the wagon with constant force.

Could the wagon move faster than the girl is running?

  1. Yes, but only if she wasn’t running fast.
  2. Yes, but only if she pulled harder and harder.
  3. Yes, but only if the force of her pull on the wagon was greater than the force of friction on the wagon.
  4. No, because if she was pulling with constant force, the wagon would have to move at constant speed.

Distribution of Responses

Chart showing distrubtion of responses for Item FM090002

Percent of students responding correctly

Grades 6–823%
Grades 9–1228%
Primary Language is English25%
Primary Language is not English27%

View data table