Students study the work and accomplishment of Galileo. In this physics lesson, students calculate the period of a pendulum's using a mathematical equation. They explain the different factors affecting its period.

Students explain the theory of simple harmonic motion (SHM) by performing hands-on, practical application experiments.

Information about the interference of sound and its causes. Well-illustrated and good explanations of the concepts; part of a large hyper-textbook on various physics concepts.

The motion of three simple harmonic oscillators is animated to illustrate the effects of mass and spring constant upon the motion. Several equations and a lengthy discussion accompany the animations.