125_Physics ProblemsTechnical Physics

125_Physics ProblemsTechnical Physics - Chapter 5 P5.22 127...

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Chapter 5 127 P5.22 The two forces acting on the block are the normal force, n , and the weight, mg . If the block is considered to be a point mass and the x - axis is chosen to be parallel to the plane, then the free body diagram will be as shown in the figure to the right. The angle θ is the angle of inclination of the plane. Applying Newton’s second law for the accelerating system (and taking the direction up the plane as the positive x direction) we have Fnm g y = = cos 0: nm g = cos Fm g m a x = = sin : ag = sin FIG. P5.22 (a) When 15 0 . a = 254 . m s 2 (b) Starting from rest vv a xx a x va x fi f ff 22 2 5 4 2 0 0 3 1 8 =+ −= == = di ej af .. . ms m 2 P5.23 Choose a coordinate system with ± i East and ± j North. Fa m 100 kg m s 2 at 30 0 . ° 5 00 10 0 30 0 5 00 8 66 1 . ± . ± . ± N N N N a f a f a f a f jF j i += ∠ °
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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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