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Ideal Springs

  1. Oct 30, 2006 #1
    I have this question
    THe work done to compress a spring with a force constant of 290.0 N/m a total of 12.3mm is.. and the answer is .0219J but i cant get this answer
    This is what i did
    F=kx
    F=290(.0123)
    F=3.567

    W=Fcos0 d
    W=3.567(.0123)
    .0439J

    What am i doing wrong??
     
  2. jcsd
  3. Oct 30, 2006 #2

    Office_Shredder

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    Notice the force is different for different distances, thus, Fd doesn't really work here.

    Do you know what the potential energy is for a spring with spring constant k compressed a distance of x?
     
  4. Oct 30, 2006 #3
    do you mean the elastic potential Ee=1/2kx2
    and then would i use that in the work equation?
     
  5. Oct 30, 2006 #4

    Office_Shredder

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    It's conservation of energy. Work must have been done against the spring to give the spring that potential energy.
     
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