In the diagram below block A has a mass of 2 kg and block B has a mass of 4 kg. A) Assume the floor is frictionless and find the tension in string 2 and the acceleration of the blocks if F=20 N. B) If the coefficient of static and kinetic friction between the blocks and the floor is 0.5 and 0.2 will the blocks move? Justify your answer. C) Using kinetic friction find the acceleration of the blocks and the tension in string 2. block B block A string 2 string 1 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?”