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Coefficient of static friction of crate

  1. Nov 15, 2008 #1
    1. The problem statement, all variables and given/known data
    A 200N crate rests on a ramp, the angle is 20 degrees with the horizontal. What is the coefficient of static friction between the crate and ramp surfaces


    2. Relevant equations
    T=N/cos theta


    3. The attempt at a solution
    200/cos25 = 219

    I don't know where to go from here. The answer is .47 Please show me a direction to take.!!!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 15, 2008 #2
    What forces are acting upon the object? (Hint: There are three forces and one of these forces has components if you choose an efficient coordinate system.)
     
  4. Nov 15, 2008 #3
    Would the three forces be gravity, the weight of the crate on the ramp, and the ramp pushing up on the crate? If so, the only one I have numbers for is gravity??
     
  5. Nov 15, 2008 #4
    Weight and gravity are related by [tex]\vec{w}=m\vec{g}[/tex]. The other two forces are going to be the frictional force (a function of the normal force) and the normal force, itself, a function of weight. So, where are your x- and y-axes going to lie?
     
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