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Unformatted text preview: 1 Total Points for Problem: 2 Points Solution to On-Line Homework Problem 18.2(Comparing frictional forces) Problem: How do the coefcients oF Friction between any particular pair oF surFaces compare? Select One oF the ±ollowing: (a) μ k > μ s (b) μ k = μ s (c-Answer) μ k < μ s (d) cannot tell without knowing the types oF sur-Faces involved. Solution The maximum value oF the static Frictional Force occurs the instant beFore the object actually moves (in which case the Friction is then kinetic) when subject to a steadily in-creasing Force. ±or example, suppose a block is sitting on a rough board, and you start trying to move it along the board. You slowly increase the Force you apply to the block. Eventually the Force you apply will be equal in magnitude to the maximum static Frictional Force, F pull = F s = μ s F N IF the pulling Force increases any more, the block will move, and the Friction will then be kinetic. 2 Total Points for Problem: 2 Points 3...
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