Calculate the magnitude of the normal force on a 22.7 kg block in the following circumstances. (Enter your answers in N.) (a) The block is resting on a level surface. N (b) The block is resting on a surface tilted up at a 35.8° angle with respect to the horizontal. N (c) The block is resting on the floor of an elevator that is accelerating downward at 4.53 m/s2. N (d) The block is on a level surface and a force of 115 N is exerted on it at an angle of 35.8° below the horizontal. N

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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?”