Two crates connected by a rope lie on a horizontal surface as shown in the figure. Crate A has mass m, and crate B has mass mg. The coefficient of kinetic friction between each crate and the surface is A and Bag for crates A and B respectively. The crates are pulled to the right at constant velocity by a horizontal force F. (a) Draw the free-body diagrams for each object. (b) Write out Newton's Equations of Motion (c) Calculate the magnitude of F in terms of ma, mg, Hak. Hak and g (d) Calculate the tension in the rope connecting the blocks in terms of mA, mg. HAK Hak and g. (e) Calculate the magnitude of the force and the tension if m=3.10 kg, mg = 4.50 kg, Hak 0.350, and HBK = 0.250

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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?”