Jim starts to pull the wagon across the yard. To move the wagon at the same speed each time, which friend does Jim need to pull with a larger force?

 - a friend who weighs 33 pounds
 - a friend who weighs 30 pounds
Look for the friend who is heavier.
A friend who weighs 33 pounds is heavier than a friend who weighs 30 pounds. So, to move the wagon at the same speed each time, Jim needs to use a larger force to start moving the wagon with a friend who weighs 33 pounds.