13. Block A, weighing 4.0 N, is placed on top of block B, which weighs 8.0 N. The coefficient of sliding friction between all surfaces is 0.25. Find the force F necessary to drag block B to the left at constant speed if: a) A rests on B and moves with it? b) if A is held at rest as shown? F A B OFF A B

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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!