1. Not finding help here? Sign up for a free 30min 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!

Simple harmonic motion

  1. Dec 11, 2004 #1
    A mass is on a spring is pulled down and released.Show thatit performs simple harmonic motion.

    as the mass is pulled down and released restoring force pulls it upwards but as it reaches on the top extreme the gravity pulls it down n continous to oscillate.but how does it prove that motion is SHM??we cannot see acceleration being proportional to the displacement
     
  2. jcsd
  3. Dec 11, 2004 #2

    Integral

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What level of mathematics can you bring to bear?

    We know that the total force acting on the mass is

    F = -mg-kx

    According to newton this is

    ma = -mg-kx

    so a = -g - (k/m) x

    Does not this show that acceleration is directly proportional to displacement?
     
  4. Dec 11, 2004 #3

    Astronuc

    User Avatar

    Staff: Mentor

    Write the 'equation of motion' of a mass attached to a spring and displaced from equilibrium.

    The weight of force of gravity is a constant force which simply displaces the spring from is equilibrium position when there is no mass.

    Remember something like - [tex]m\ddot{x}\,+\,k\,x\,=0[/tex]
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Simple harmonic motion
Loading...