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Homework Help: Work done to overcome friction

  1. Mar 26, 2013 #1
    im having a hard time to solve this work done by overcoming friction question. help please?

    Question: a block with mass 30kg slide on a rough inclined plane with 8m long and 28 degree to horizontal with acceleration 1.5ms^-2.
    a)Calculate the work done to overcome friction.
    b)the coefficient of kinetic friction between the block and the plane
  2. jcsd
  3. Mar 26, 2013 #2
    Start by writing down the free-body diagram equations.
  4. Mar 26, 2013 #3
    done that and got kE=360.15J
  5. Mar 26, 2013 #4
    And how does this help?
  6. Mar 26, 2013 #5
    well,the answer for work done to overcome friction is WFf= -745.36J. wonder why was that.
  7. Mar 26, 2013 #6
    What is the relationship between work, kinetic and potential energy?
  8. Mar 26, 2013 #7
    it helps abit but i got (-745.17J) tho
  9. Mar 26, 2013 #8


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    Homework Helper

    What value are you using for g (gravitational acceleration)? Perhaps the problem statement is using a different value than what you're using.
  10. Mar 26, 2013 #9
    k thanks for your help.
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