A mom is pulling her son and daughter who are sitting in two sleds that are connected by a rope. The mass of the girl and sled 1 is 55 kg, the mass of the boy and sled 2 is 65 kg. The mom is pulling so that the sleds accelerate at a rate of 0.32 m/s2 . The coefficient of kinetic friction between the sleds and the ice is 0.25 a) Draw a free-body diagram for the girl and sled 1 b) Determine the force with which the mom is pulling the sleds.

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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?”