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How to find the k constant of a spring?

  1. Apr 7, 2009 #1
    EDIT: I just found the homework board, mods: don't bother moving this thread, just delete it. Thanks

    We had a lab where we launch springs with an unknown k constant to a target 2.01m away and 0.22m high. We also know the angle at which we shot the spring.

    We need to find the k constant of the spring, so my question is, does the kinetic energy matter?

    Will the equation be:

    Eg + Ee = Eg + Ek (The spring had gravitational potential as it was launched a bit higher than the reference position (the table)


    Eg + Ee = Eg

    Last edited: Apr 7, 2009
  2. jcsd
  3. Apr 7, 2009 #2
    If I did the Eg + Ee = Eg method, then my k constant turned out to be 2.752 N/m.

    The spring's length at equilibrium is 0.04m; the spring is quite tiny.

    Does this k constant seem to small?
  4. Apr 7, 2009 #3
    Also, using F= kx, the force contained in the spring when x = 0.035m, is 0.09632N

    Are these values too small, which could possibly hint the method I tried is wrong?
    Last edited: Apr 7, 2009
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