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Homework Help: Hookes law question need help

  1. Oct 17, 2011 #1
    1. The problem statement, all variables and given/known data

    given a spring constant of 2.1 x 10^6 N/m, calculate the amount of force needed to stretch a steel rod 0.001m

    2. Relevant equations


    3. The attempt at a solution

    dont know
  2. jcsd
  3. Oct 17, 2011 #2
    its plug and chug problem........... you can't do it ? k and x is given.........find f
  4. Oct 17, 2011 #3
    Hookes law states that the force required to stretch/compress a spring is proportional the the distance it stretches. That is where F = kx comes from, since the proportionality statement implies that they differ by a constant. If the constant k was 1, the force would equal the distance and so on. You are given k (the coefficient of proportionality aka spring constant) and x the distance, you simply need to solve for the force right?
  5. Oct 17, 2011 #4
    correct but idk
  6. Oct 17, 2011 #5
    Let's say A = b*c

    b = 10
    c = 10

    What is A equal to?
  7. Oct 17, 2011 #6


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    Given a value for k, and a value for x, can you calculate f ?
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