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Resultant forces on objects and springs

  1. Aug 8, 2014 #1
    1. The problem statement, all variables and given/known data
    Hi

    I've been struggling to work this out over the last week, so any help would be appreciated!

    1: An object of mass 400kg is dragged at a constant velocity of 0.5m/s up a rough slope inclined at 25degrees to the horizontal. Given that coefficient of kinetic friction between object and ground = 0.75, at what rate is work done against friction?


    2. Relevant equations

    1: Power = work/time

    3. The attempt at a solution

    I haven't unfortunately gotten past knowing what equation to use :/
     
    Last edited: Aug 8, 2014
  2. jcsd
  3. Aug 8, 2014 #2

    HallsofIvy

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    Have you drawn a picture with the individual force vectors?
     
  4. Aug 8, 2014 #3
    I've tried for question 1 but don't know how to progress with it.
     
    Last edited: Aug 8, 2014
  5. Aug 8, 2014 #4

    Simon Bridge

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    You don't need it. Part 2 is not even a force problem - try using energy conservation instead.
     
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