Generally speaking, a system undergoes simple harmonic motion if
there is a restoring force that increases linearly with
displacement from equilibrium. In the discussion, describe how a
pendulum and a mass on a horizontal spring satisfy those conditions
(ignore any friction forces); also, include another example of a
real world system that undergoes simple harmonic motion and discuss
how it satisfies the conditions mentioned above. Finally, be sure
to respond to at least two of your peers’ discussion posts.