A horizontal force F is applied to a block on a horizontal surface with friction. The magnitude of F is gradually increased, starting from zero, until the block starts sliding. The force F then continues to increase. Which graph best shows the magnitude of the friction force f as a function of the applied force F? f O O B) O U OE) D) A) A) F f ا اعات B) F f C) F f D) F f E) 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?”