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A problem with Gravitational and Elastic Potential Energy

  1. Sep 16, 2015 #1
    I am calculating the energy transfer in two different formulas and they are giving different results. What could be the reason of this difference? I would be grateful if someone tell me what i am missing here.

    http://s18.postimg.org/o4tknn77d/potential.jpg
     

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  2. jcsd
  3. Sep 16, 2015 #2

    BvU

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    Hello Poppy (!?) :smile: welcome to PF !

    Does the weight hang still in the picture ?
     
  4. Sep 16, 2015 #3
    The weight was at 1m high in pic.1
    Then you connect it with the spring and release, it stays in equilibrium like pic.2
     
  5. Sep 16, 2015 #4

    BvU

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    What happens if you release the weight ?
    In particular: at the equilibrium line. Does it stop going down abruptly at this equilibrium line ?
     
  6. Sep 16, 2015 #5
    So, is it going to have a 5J kinetic energy and swing for a time ?
     
  7. Sep 16, 2015 #6

    BvU

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    You got it !
    A point where you can do the energy check is when the weight reverses direction, i.e. at the lowest point: there the extension is two meters and the drop is 2 meters as well.
     
  8. Sep 16, 2015 #7
    I've been thinking this for 3 days and at last i got it here. thanks so much :)
     
  9. Sep 16, 2015 #8

    BvU

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    You're welcome !
     
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