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Spring and friction assignment

  1. Jun 8, 2007 #1
    another physics question..plz

    Albertine sits ina reclining chair, in front of a large, compressed spring. The spring is compressed 5m from its equilibrium position, and a glass sits 19.8 m from her outstretched foot. Assuming that Albertine's mass is 60kg what is the coefficient of kinetic friction between the chair and the waxed floor?

    U(kinetic) = F/N
    N= 588
  2. jcsd
  3. Jun 9, 2007 #2
    Assuming that she just touches the glass, [tex]0.5kx^2=\mu mgx[/tex] where x is 19.8 m, but you dont know k (spring const) which is reqd.
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