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143_Physics ProblemsTechnical Physics

143_Physics ProblemsTechnical Physics - Chapter 5 P5.57(a...

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Chapter 5 145 P5.57 (a) The crate is in equilibrium, just before it starts to move. Let the normal force acting on it be n and the friction force, f s . Resolving vertically: nF P g =+ sin θ Horizontally: Pf s cos = But, FIG. P5.57 fn ss μ i.e., PF P sg cos sin + ch or g cos sin −≤ a f . Divide by cos : g 1 tan sec af . Then P F s minimum = sec tan 1 . (b) P = () 0400100 10 4 0 0 .s e c .t a n N deg
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