US Sheppard, Anagnos, Billington, Engineering Mechanics: Statics, le Practice As
ID: 1782563 • Letter: U
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US Sheppard, Anagnos, Billington, Engineering Mechanics: Statics, le Practice Assignment Gradebook ORION Downloadable eTextbook signment sExercise 7.1.05 CALCULATOR ME Your answer is idorrect. Try again. If the static and kinetic coefficients of friction are o.s9 and 0.43, respectively, and the angle of the incline is 1s 15®, determine the friction force acting on the block if Y | | Assume m = 2.8 kg. Block Click if you would like to Show Work for this question: Open Show wark G All Rights Reserved. A Division of John Wiley &Sona.Ins.;Explanation / Answer
Weight component acting downwards the incline = mgsin15 = 2.8 x 9.8 x sin15 = 7.102 N
also maximum static friction force = 0.59mgcos15 = 0.59 x 2.8 x 9.8 x cos15 = 15.638 N
kinetic friction = 0.43mgcos15 = 0.43 x 2.8 x 9.8 x cos15 = 11.397 N
a) P = 8 N > mgsin15.
friction will act downward, also P - msin15 = 8 - 7.102 = 0.898 N < 15.638
friction force = 0.898 N
b) P = 57 N > mgsin15
friction will act downward, also P - msin15 = 57 - 7.102 = 49.898 N > 15.638
friction force = kinetic friction = 11.397 N
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