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Spring Constant

  1. May 14, 2009 #1
    Q. An object of mass o.4kg slides at 8m/s across a frictionless path before striking one end of a spring that is fixed at the other end. the spring constant is 80N/m. the maximum distance, in metres, by which the spring compressed is : ans?




    I a not sure wether to use hookes law (f=ks) or the kinetic energy formula Ek = .5kmv^2

    when i used hookes law i got an answer of 0.04 but when i use the kinetic energy forumla i got 0.57. I know it doesnt really make any sense to use hookes law as u cant find the force, only the momentum (0.4x 8)

    any help with this would be greatly apreciated



    3. The attempt at a solution
     
  2. jcsd
  3. May 14, 2009 #2

    Doc Al

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    Staff: Mentor

    It sounds like you're answering your own question. :wink:
     
  4. May 14, 2009 #3
    so its the kinetic formula cos it wouldnt make sense to use the hookes law right? but since when can u have the spring constant in a kinetic energy formula?
     
  5. May 14, 2009 #4

    Doc Al

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    Staff: Mentor

    Yes, you'll need to use energy conservation.
    Consider the potential energy stored in a compressed spring--that's where the spring constant appears.
     
  6. May 14, 2009 #5
    cheers buddy
     
  7. May 14, 2009 #6
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