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Friction Question

  1. Oct 14, 2007 #1
    1. The problem statement, all variables and given/known data
    You push a 2.4 kg block against a horizontal spring, compressing the spring by 29 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 83 cm from where you released it. The spring constant is 300 N/m. What is the coefficient of kinetic friction between the block and the table?


    2. Relevant equations
    0 (initial KE) + 0 (initial PE) + 1/2k(change in X)^2= 0 (final KE) + 0 (final PE) + Ukmgd and solve for Uk (coeffient of kinetic friction)


    3. The attempt at a solution
    I did this plugged in 300 for k, 0.54 for change in x, 2.4 for m, 9.8 for g, and 0.83 for d... I got 2.24 for the answer and it was wrong. I can't seem to find out what I'm doing wrong with this problem.
     
  2. jcsd
  3. Oct 14, 2007 #2

    Doc Al

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    Staff: Mentor

    How far was the spring compressed?
     
  4. Oct 14, 2007 #3
    It would be 0.29m right?
     
  5. Oct 14, 2007 #4

    Doc Al

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    Staff: Mentor

    Right.
     
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