As illustrated in the right figure, three blocks with masses of mA, mB, and mC are placed on top of each other. On the middle block B, a force F is applied. Assume the static friction coefficient between the blocks is s and the kinetic friction coefficient between block C and the surface is k. Fill in the blanks with your answers in mA, mB, mC, F, s, k, and/or g. (Not all of the variables may be required.) (1) (a) What is the frictional force between blocks A and B if all three blocks move at the same speed v when the force F is applied? (b) If you want to be more formal  What is the frictional force between the surface and block C, continuing from part (a)? Assume the surface is frictionless and the three blocks continue to move in unison. (b)  What is the rate of change?

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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!