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Minimum coefficience of friction PLEASE HELP

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data

    A box with a mass of 20N is tied to another box with a mass of 15N hung over a pulley on an incline of 10 deg. please find the minimum coefficience (mu) for remaining stationary

    2. Relevant equations
    Not too sure, F(mu)=(mu)N N being normal force


    3. The attempt at a solution

    3.47/19.70 = (mu)19.70/19.70

    mu =0.176

    Im not sure if there are more steps beyond this, but this is what I got for mu any help on this please?
     
  2. jcsd
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