Your niece has asked you to take her sledding. Your niece and the sled have a combined mass of 30 kg, and the coefficients of friction between the sled and the snow are μ_s=0.19 and μ_k=0.06. Assuming you get a running start at the hill, with what force do you need to pull on the sled (parallel to the slope) to maintain constant velocity up the hill? Draw and label your free body diagram and sum your forces to solve for F

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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?”