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Homework Help: Spring Constant & Potential Energy

  1. May 1, 2013 #1
    1. The problem statement, all variables and given/known data
    Problem - Find the following:
    a. Potential energy in a fully compressed plastic spring.
    b. Spring constant

    This was a lab and we're supposed to do it at home, here are the variables I have measured:
    spring height when not compressed: 0.115 metres.
    spring height when completely compressed: 0.0450 metres
    mass of spring: 0.0148kg

    2. Relevant equations
    Hookes Law:
    Ep = 1/2kx^2
    Fs = mg

    3. The attempt at a solution
    The answers we got seemed extremely low.
    A)1/2(2/074N/m)(0.07m)^2 = 0.00508J
    B)(0.0148kg)(9.81m/s^2)/0.07m = 2.074N/m

    Any help would be great.
  2. jcsd
  3. May 1, 2013 #2
    Dear Bonana,
    could you tell a bit about the setup of the experiment? How did the spring get compressed: by an external force or by its own weight?
  4. May 1, 2013 #3


    User Avatar
    Homework Helper

    If these are the measured data, the results are correct. It can be a weak spring.

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