1. Nov 6, 2011 #1

   JustinLiang

   

   1. The problem statement, all variables and given/known data
   Since the total energy in a spring is
   (1/2)kA^2
   
   Can we rearrange this...
   given k=F/x
   (1/2)(FA^2/x)
   
   Since x is also the amplitude, we have:
   (1/2)(FA)
   (1/2)(mgA)
   
   I am pretty sure this is wrong, but why?
   
   Thanks

    

   JustinLiang, Nov 6, 2011
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3. Nov 6, 2011 #2

   PhanthomJay

   

   Science Advisor

   Homework Helper

   Gold Member

   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.

    

   PhanthomJay, Nov 6, 2011

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