Transcription: And another example. How can a horse pull a cart if the cart pulls back with an equal force? To analyze this, we have to look at each object alone and the forces acting on it. What forces act on the cart? The horse pulls it forward and there is a backward force from the ground. Friction. If the horse's pull exceeds the friction, the cart wins. will accelerate. Now the horse. The cart pulls it backward by Newton's third law. What pushes the horse forward? It's the ground. The horse pushes backward on the ground, so the ground pushes forward with an equal force. If the horse can push back agains ...
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