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Finding Friction

  1. Nov 3, 2007 #1
    1. The problem statement, all variables and given/known data

    A 37 kg box slides down a 35 degree ramp with an acceleration of 1.35 m/s^2. The acceleration of gravity is 9.81 m/s^2.

    Find the coefficient of kinetic friction between the box and the ramp.


    2. Relevant equations

    Ff= MkFn
    Finding X and Y components of Fg

    3. The attempt at a solution

    Fg = 37 * 9.81 = 362.97 N
    Fgx = 362.97 sin 35 = 208.1910391
    Fgy = 362.97 cos 35 = 297.3276175

    Fn = Fgy

    F = ma
    F = 37 * 1.35 = 49.95

    49.95 / 297.3276175 = 0.167996 <~coefficient of kinetic friction

    Did I do this right? What did I do wrong?


    I think I did something wrong because the coefficient is greater than one

    Please check what I did wrong and how can I fix it?
     
  2. jcsd
  3. Nov 3, 2007 #2
    This is wrong. You can find the frictional force from known data and
    [tex]\mu[/tex] = F[tex]_{fric}[/tex] / F[tex]_{normal}[/tex]
     
  4. Nov 3, 2007 #3

    Astronuc

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    Staff: Mentor

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