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Hooke's Law on a Slope with friction.

  1. Jun 15, 2010 #1
    1. The problem statement, all variables and given/known data

    Question is in attachment

    2. Relevant equations



    3. The attempt at a solution

    I mananged to find the acceleration up the slope but cannot get any further than this?
    - can someone please give me hint; push in the right direction

    Thanks :D
     

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  2. jcsd
  3. Jun 15, 2010 #2
    Better image here
     

    Attached Files:

  4. Jun 15, 2010 #3

    radou

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    Hint (again): energy conservation.
     
  5. Jun 15, 2010 #4

    K^2

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    Solve it as a harmonic oscillator, but add a constant to the position, so that x(0)=constant. Solve for that constant, and the rest should follow.

    Edit: Oh, wow, energy conservation is a lot easier. Never mind.
     
  6. Jun 15, 2010 #5
    Mmm energy conservation i get, im just trying to figure out the work done?
    I've the force at the most compressed point, but it changes over the 0.2m it acts upon?
    - what am i missing?
     
  7. Jun 15, 2010 #6

    K^2

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    You can separate out the work done against friction. Kinetic energy is trivial. All that's left is to consider gravitational and spring potentials at 0 and at D.
     
  8. Jun 15, 2010 #7
    Ok thanks for the helping hints, i'll post back if i still can't get it

    - Cheers :D
     
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