A 200-lb block is at rest at 30 degree incline. The coefficient of friction between the block and the incline is 0.20. Compute the value of the horizontal force P that will cause motion to impend up the incline.

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A: The below figure represents the free body diagram of the sled.

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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?”