The blocks shown below are connected by cords passing over frictionless pulleys. The coefficients of friction between block A and the ground surface are u, = 0.30 and uz = 0.20 while that of block B and the ground surface are u, = 0.40 and ux = 0.30. Determine the direction of motion (to the left or to the right) of both blocks if it will occur, and compute the magnitude of the actual friction force in kN acting on each block. A 3 kN 3 В 4 4 3 2 kN

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A: Free body diagram for all the three blocks is as shown below:

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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?”