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Friction/Inclined plane question, help would be appreciated

  1. Jan 9, 2012 #1
    Friction/Inclined plane question, help would be appreciated :)

    A box is sent sliding up a plane, inclined to the horizontal at 25.0◦ with an
    initial speed of 3.0 m/s.
    The coefficient of kinetic friction between the box
    and the plane is 0.17. How far up the plane does the box go before coming to
    rest



    f=F[itex]\mu[/itex]



    I rearange the equations using F=ma, using trig etc, and i dont get the answer which is supposedly 0.8m

    Thanks
     
  2. jcsd
  3. Jan 9, 2012 #2
    Re: Friction/Inclined plane question, help would be appreciated :)

    Please explain how you got a result, and what the result was ...
     
  4. Jan 9, 2012 #3
    Re: Friction/Inclined plane question, help would be appreciated :)

    I got, F=mgcos25
    and fk(kinetic friction) = 0.17mgcos25

    then
    f=ma
    hence
    fk+mgsin25=f
    ma=0.17mgcos25+mgsin25
    a=0.17gcos25+gsin25
    =5.66m/s^2

    i then put that into v^2=u^2+2ax

    and got x=0.14
     
  5. Jan 9, 2012 #4
    Re: Friction/Inclined plane question, help would be appreciated :)

    You did something wrong here
    Try it again ...
     
  6. Jan 9, 2012 #5
    Re: Friction/Inclined plane question, help would be appreciated :)

    ah thank you, was for some reason doing a^2 :)
     
  7. Jan 9, 2012 #6
    Re: Friction/Inclined plane question, help would be appreciated :)

    You're Welcome !!
     
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