A block of mass 7 kg is placed on top of a block of mass 10 kg, which in turn sits on a frictionless horizontal surface, as shown in the figure. A force F = 20 N is applied to the 10 kg block, and the 7 kg block is held in place by a string attached to the wall. There is static friction ( µs=0.1) between the blocks, which keeps the lower block from moving. a) Demonstrate the free body diagram and the motion equation of the system. b) Calculate the acceleration of the block 10 kg. c) Calculate the tension T.

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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?”