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Inclined plane, Calculate friction force

  1. Sep 24, 2013 #1
    1. The problem statement, all variables and given/known data

    work.jpg

    2. Relevant equations

    Wnet = Ek

    3. The attempt at a solution

    1) That was fine.
    2) I just want to confirm if this answer is right?, I got 12.28N. Used work energy theorem.

    Sorry for double post, edited the title
     
  2. jcsd
  3. Sep 25, 2013 #2

    haruspex

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    Seems a bit high. Pls post your working.
     
  4. Sep 25, 2013 #3
    Sorry my mistake, forgot something in my calculation. Anyway heres my working

    Wnet = Ek
    Wg + Wf + Wn = 1/2*m(vf^2 - vi^2)
    (5*9.8*sin30*20) - 20Ff + 0 = 1/2*5(12^2 - 6^2)...That 20 is the length of the incline
    Ff = 11N.........Now correct?
     
  5. Sep 25, 2013 #4

    haruspex

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    Yes, that looks right.
     
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