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Homework Help: Potential energy of a spring!

  1. Jun 15, 2010 #1
    ~~potential energy of a spring!

    1. The problem statement, all variables and given/known data

    A spring with a 0.500kg mass is pulled 0.25m from the equilibrium position. Calculate the potential energy of the spring at 0.25m, if the spring constant is 6.8N/m.

    2. Relevant equations

    Ep=mgh
    Ep=kx^2/2

    3. The attempt at a solution

    Don't know where to start, sorry!
     
  2. jcsd
  3. Jun 15, 2010 #2
    Re: ~~potential energy of a spring!

    <Solution deleted by mods>
     
    Last edited by a moderator: Jun 15, 2010
  4. Jun 15, 2010 #3

    Redbelly98

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    Re: ~~potential energy of a spring!

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  5. Jun 16, 2010 #4
    Re: ~~potential energy of a spring!

    You've got both equations right, now you just need to figure a couple o' things out:
    How much gravitational energy did it gain from being streched? (Because streching it could mean the center of mass is closer to or further from the earth's center)
    How much "spring"-energy did it gain?

    It also depends on wether the spring lies on the floor, flat, or hangs from the cieling, eg.
     
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