A block of mass m = 7 kg is placed on top of a block of mass M = 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 attatched to the wall. There is static friction between the blocks, which keeps the lower block from moving. The coefficient of static friction between the two blocks is μs = 0.5 T μ = 0 m M Hoy > 0 F

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!