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Homework Help: Total energy in a spring?

  1. Nov 6, 2011 #1
    1. The problem statement, all variables and given/known data
    Since the total energy in a spring is

    Can we rearrange this...
    given k=F/x

    Since x is also the amplitude, we have:

    I am pretty sure this is wrong, but why?

  2. jcsd
  3. Nov 6, 2011 #2


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    yes, where F is the max force in the spring and A is the absolute value of x.
    Only if F = mg, as when a mass is attached from a hanging spring and released.
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