Consider the system shown in the figure (Figure 1). Block A has weight wA and block B has weight wB. Once block B is set into downward motion it descends at a constant speed. Assume that the mass and friction of the pulley are negligible. Calculate the coefficient of kinetic friction u between block A and the table top. Express your answer in terms of some or all of the variables WA (double-u subscript A), WB, and g (the acceleration due to gravity).

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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?”