Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding the Coefficient of Kinetic Friction

  1. Oct 25, 2008 #1
    This problem has been giving me some trouble, and I was wondering if anyone could help?

    A 0.700 kg wood block is firmly attached to a very light horizontal spring (k = 200 N/m) as shown in the figure (Intro 1 figure) . This block-spring system, when compressed 4.7 cm and released, stretches out 2.5 cm beyond the equilibrium position before stopping and turning back.

    What is the coefficient of kinetic friction between the block and the table?

    I just can't seem to find the correct equation.

    I know that it involves 1/2kx^2. I am just not sure how to find the uk using that.

    Any bit of help is greatly appreciated.
  2. jcsd
  3. Oct 25, 2008 #2


    User Avatar
    Homework Helper

    Hi besenji,

    I would suggest using the equation that relates non-conservative work to the change in energy. What do you get?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook