Practice: Force Pairs and Newton’s Third Law of Motion

A roller coaster car travels along a circular track, where the bottom of the track is on the ground and the top of the track is above the ground, as shown in the diagram. The wheels of the car stay in contact with the track even when the car is upside down. At the top of the loop, the car’s momentum makes its wheels push upward on the track with a force of 6,000 N. The car’s weight is 4,500 N. What force does the track apply to the car’s wheels when the car is at the top of the loop?