Using the definition of the static friction and the first condition of equilibrium, show that the coefficient of static friction in method A is the ratio of the weight of the pan plus its contents to the weight of the carrier of the pan plus its contents to the weight of the carrier plus its content. Note: Show your free body diagrams.

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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?”