Draw a free-body diagram for block A, showing the force of gravity on it, the force (tension) exerted by the cord, and any normal force.         2. Draw a free-body diagram for block B, showing the force of gravity on it, the force (tension) exerted by the cord, and any normal force.

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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?”