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Work and friction

  1. Aug 4, 2009 #1
    1. The problem statement, all variables and given/known data
    A force of 52 N is applied to a 12 kg mass resting on a bench where the force of sliding friction is 15 N. The work done in overcoming friction while moving the object 24 m is


    2. Relevant equations
    w=fd


    3. The attempt at a solution
    could i just subtract 15N from 52N, then multiply that number by 24m to find the work??
     
  2. jcsd
  3. Aug 5, 2009 #2

    ideasrule

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    Why subtract? 52-15 would be the net force on the object, so if you plug that into W=Fd, you'd find the block's final kinetic energy. You want the work done by friction--which, because of the conservation of energy, is equal to the work done in overcoming friction.
     
  4. Aug 5, 2009 #3

    rl.bhat

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    The work done in overcoming friction = frictional force X displacement.
     
  5. Aug 5, 2009 #4
    so all i do is multiply 15N by 24m??
     
  6. Aug 5, 2009 #5

    ideasrule

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    Yes, that's the work done by friction.
     
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