A car is moving east along a straight, level road at a constant velocity. Which forces form an action/reaction force pair?

Newton’s third law says an action/reaction pair consists of two forces that are equal and opposite and act on different objects. The tires push on the road, and the road pushes back on the tires, so these forces form a pair. The weight and the upward normal force both act on the car, so they are not a third-law pair.

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