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Help with physics question

  1. Jun 8, 2007 #1
    help with physics question plz

    Some sliding rocks approach the base of a hill with a speed of 16 m/s. The hill rises at 40degrees above the horizontal and has coefficients of kinetic and static friction of .420 & .610 respectively, with these rocks. A) find the acceleration of the rocks as they slide up the hill. B) if it slides down, find its acceleration on the way down

    F=F(static) + F (kinetic)

    i'm not sure how to approach this problem. I first tried finding the vector velocities but that didn't work too well...
     
  2. jcsd
  3. Jun 8, 2007 #2

    Doc Al

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    Staff: Mentor

    What forces act on the rocks as they slide up the hill? (Don't add static and kinetic friction--in any given situation, only one acts.)
     
  4. Jun 8, 2007 #3
    as they slide up it would be the applied force??..but i'm not sure how to find that
     
  5. Jun 8, 2007 #4

    Doc Al

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    Staff: Mentor

    I see no mention of any applied force. What other forces act on the rocks?
     
  6. Jun 9, 2007 #5
    as always try to draw a free body diagram
    resolve the forces into proper components
    then plug in your values
     
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