A horse is harnessed to a sled having a mass of 236 kg, includingsupplies. The horse must exert a force exceeding 1 240N at an angle of 35.0° in order to get the sled moving. Treatthe sled as a point particle. (a) Calculate the normal force onthe sled when the magnitude of the applied force is 1 240 N.(b) Find the coefficient of static friction between the sled andthe ground beneath it. (c) Find the static friction force whenthe horse is exerting a force of 6.20 x 102 N on the sled at thesame angle.

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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?”