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Homework Help: Question involving spring constant

  1. Dec 10, 2009 #1
    1. The problem statement, all variables and given/known data
    We have a spring that is 30cm with a spring constant of 12000N/m
    and there is a 65 kg weight put onto this spring. What is the new length of the spring?

    2. Relevant equations
    f = k *changeof* x

    3. The attempt at a solution
    I tried to take 65kg times 9.81 to find newtons (which is 637.65N)
    so therefore 637.65 = 12000 *change of* x
    and x = 637.65/12000
    But something feels fishy about this, a spring doesnt move down just .053 m
  2. jcsd
  3. Dec 10, 2009 #2


    User Avatar

    Think about it for a moment longer. How big is 637.65 N compared to 12000 N?

    Then convert .053 m into centimeters. Now does it seem so unreasonable?
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