This interactive activity from ZOOM offers a chance to experiment with a virtual pendulum and to see how it can be influenced by a variety of factors.

A series of graphics, downloadable animations and text describe and explain the motion of a pendulum. Some sections require an understanding of calculus.

Simple harmonic motion is described and explained and related to a Helmholtz resonator. Relation between simple harmonic motion and a vibrating air column is clearly made in an effort to explain why a pop bottle resonates when blowing...