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Find the Spring Constant

  1. Oct 14, 2009 #1
    1. The problem statement, all variables and given/known data
    When a 9.10 kg mass is placed on top of a vertical spring, the spring compresses 4.22 cm.
    Find the force constant of the spring.


    2. Relevant equations
    F=kx
    F=ma


    3. The attempt at a solution
    I know that Fgravity should =Fspring so I set the two above equations equal to each other and plug in the proper values.
    I will also convert the cm to meters so my answer has the correct units.

    9.10(9.81)=k(.0422)
    89.271/.0422=k
    k=2115.43

    It wants the answer in kN/m
    I put 2120 first, because I thought it had the right number of sigfigs, but that was wrong.
    So then I put in my exact answer which was also wrong.

    What am I doing wrong?
     
    Last edited: Oct 14, 2009
  2. jcsd
  3. Oct 14, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Hint: kN/m?

    AM
     
  4. Oct 14, 2009 #3
    I realized that about an hour later. Thanks.
     
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