4. A block is pulled along a surface of negligible friction by a spring scale that exerts a force F on the block. The mass of the block is 4 kg, and the spring scale reads 10 N. Which of the following free-body diagrams can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along the surface? (A) O FNormal F FSpring Gravity FNormal FSpring FGravity (B) FNormal FGravity Normal FGravity FSpring F Spring

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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?”