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Work done and friction problem

  1. May 26, 2010 #1
    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


    w=fd
    w=(37N)(24m)
    w=888J


    Does this procedure seem correct ? :) Thank you!
     
  2. jcsd
  3. May 26, 2010 #2

    PhanthomJay

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    No. You have calculated the net force and net (total) work done on the object. The total work done on the object includes the work done by the applied 52 N force, and the work done by the friction force. The work done to overcome friction is the work necessary to keep the object moving at constant velocity.
     
  4. May 26, 2010 #3
    What formula would I use to find the work done to overcome friction? I sort of understand but am still a bit confused
     
  5. May 26, 2010 #4

    PhanthomJay

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    The work done to overcome friction while moving the block 24 m is the negative of the work done by friction while moving the block 24 m.
     
  6. May 27, 2010 #5
    So it would be -888J?
     
  7. May 27, 2010 #6
    24m*15N=360?
     
  8. May 27, 2010 #7

    PhanthomJay

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    360 J, yes.
     
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