137_Physics ProblemsTechnical Physics

# 137_Physics ProblemsTechnical Physics - Chapter 5 P5.46...

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Chapter 5 139 P5.46 (Case 1, impending upward motion) Setting FP n fn fP PP x ss = == ° 05 0 0 0 50 0 0 250 0 643 0 161 :c o s . o s . .. . ,, max max µµ af Setting P P y = = 0 500 0161 300980 0 48 6 :s i n . . . max a f N (Case 2, impending downward motion) As in Case 1, s , . max = 0161 Setting P P y + = = 0 0 31 7 i n . . . min N FIG. P5.46 *P5.47 When the sled is sliding uphill Fm a nm g fnm g a m g m g m a vv a t va t yy kk xx k fi i =+ = + = == + =− o s cos i n c o s θ θµ 0 0 up up up up up xv v t xa t t a t if = 1 2 1 2 0 1 2 di ej up up up up up up 2 f n mg cos mg sin y x FIG. P5.47 When the sled is sliding down, the direction of the friction force is reversed:
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## This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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