Question 2: For each of the following draw a free body diagram that includes all of the forces acting on the object described. a. A 40 kg box on a level floor is pulled by a rope attached to the box. The ropes makes an angle of 21° with the horizontal. A force of friction opposes the motion. b. A refrigerator sits on a level floor and a person tries to push on it with a force parallel to the floor. The refrigerator does not move.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”