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Homework Help: Potential Energy and Conservation of energy

  1. Mar 11, 2008 #1
    1. The problem statement, all variables and given/known data
    How does the work required to stretch a spring 2cm compare with the work required to stretch a spring 1 cm?

    2. Relevant equations

    3. The attempt at a solution

    i think its twice the work
  2. jcsd
  3. Mar 11, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Assuming that the two springs are the same and Hookean, you are wrong.
  4. Mar 11, 2008 #3
    P.E. of a spring is 1/2kx^2 , which is directly proportional to the square of extension from the natural length
  5. Mar 11, 2008 #4
    you can derive the expression for the potential enegy of the spring by integrating the hooke law over the distance moved.
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