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Spring problem

  1. Nov 14, 2008 #1
    Spring problem!!!

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

    A 1.60 kg block hangs from a spring. If a 400 g body is hung from the block, the spring is stretched 2.00 cm farther. What is the spring constant?

    2. Relevant equations

    Fsp=-kdeltas

    3. The attempt at a solution

    (2.0Kg)(9.8)/(0.02)=k
    k-980 N/m.... which is wrong

    So I am assuming that at equilibrium with m1 x=0, and when the second mass is added the total displacement is delta s=0.02 m - what am I missing?
     
  2. jcsd
  3. Nov 14, 2008 #2

    Hootenanny

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    Re: Spring problem!!!

    Are you really applying 2*9.8 Newtons of additional force to the spring?
     
  4. Nov 14, 2008 #3
    Re: Spring problem!!!

    Ohhhh! It makes sense now!
     
  5. Nov 14, 2008 #4
    Re: Spring problem!!!

    Thank you!
     
  6. Nov 14, 2008 #5

    Hootenanny

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    Re: Spring problem!!!

    A pleasure :smile:
     
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