A horse pulls a cart forward by exerting a force on it through the harness

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A horse pulls a cart forward by exerting a 100 N100\,\text N force on it through the harness. According to Newton’s third law, which of the following is the correct action–reaction force pair? (a) Force of the horse on the cart (100 N100\,\text N forward) and friction on the cart’s wheels (100 N100\,\text N backward). (b) Force of the horse on the cart (100 N100\,\text N forward) and force of the cart on the horse (100 N100\,\text N backward). (c) Force of the ground on the horse (100 N100\,\text N forward) and force of the horse on the ground (100 N100\,\text N backward). (d) Force of the horse on the cart (100 N100\,\text N forward) and weight of the cart (100 N100\,\text N downward).

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