1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Two springs supporting a mass verticle

  1. May 30, 2014 #1
    1. The problem statement, all variables and given/known data
    Two springs have spring constants k1 and k2, are in a vertical position to support a single object of mass m. Show that the angular frequency of oscillation is ((k1+k2)/m)^(1/2) if the springs are in parallel.

    3. The attempt at a solution

    The book then goes on to explain
    F = ma = -k1*x - k2*x
    a + ((k1+k2)*x) / m = 0
    where (k1+k2)/m = w^2
    my question is why is gravity neglected?
  2. jcsd
  3. May 30, 2014 #2

    Doc Al

    User Avatar

    Staff: Mentor

    They aren't really neglecting gravity. Note that the displacement (the x) is measured from the equilibrium position, so the effect of gravity is already included. (Gravity, being a constant force, merely shifts the zero point.)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted