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Homework Help: Please Check My Work

  1. Dec 13, 2004 #1
    I want to make sure if I have done the Eleastic Energy part and also the Gravitational Potential correctly. Please respond fast. handing it on Dec.14
    ElasticEnergy.jpg

    Thank YOU :smile:
     
  2. jcsd
  3. Dec 13, 2004 #2
    hmm......which equations did u use? for the spring potential did u use:
    [tex]Us=.5kx^2[/tex]

    did u use [tex]Ug=mgh[/tex] grav. potential?

    this may be just b/c i don't understand ur table......y is the spring unstretched value lower than ur starting point?
     
    Last edited: Dec 13, 2004
  4. Dec 13, 2004 #3
    I used [tex]Ug=mgh[/tex] to find the gravititional potential.

    This is a picture to give you an idea of how it is.
    ElasticEnergy2.jpg

    The starting point is 7cm plus the extra 2cm. We had to hold it there. After that, I let of the weight and when it bouncing, i had to quickly measure the lowest point. Now, I know I did something wrong. because gravititional potential should be decreasing as the elastic energy is increasing.
     
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