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Work Done by Friction

  1. Oct 21, 2007 #1
    1. The problem statement, all variables and given/known data

    Jim rides his skateboard down a ramp that is in the shape of a quarter circle with a radius of 6.50 m. At the bottom of the ramp, Jim is moving at 2.82 m/s. Jim and his skateboard have a mass of 67.0 kg. How much work is done by friction as the skateboard goes down the ramp?
    __________ J



    2. Relevant equations

    w=f*d

    3. The attempt at a solution

    Is this sort of a angular velocity problem? I dont even know how to set this one up
     
  2. jcsd
  3. Oct 21, 2007 #2
    disregard this post....sorry i posted it twice
     
  4. Oct 21, 2007 #3
    You could try conservation of energy:

    K + U + W[nonconservative forces] = K[f] + U[f]

    Where the work done by nonconservative forces is the force of friction times the distance.
     
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