Damped Harmonic Motion - Mathematical Equations of Damped Harmonic Motion

Simple Harmonic Motion-A Graphical Interface - A good site with extensive graphical visualizations. Nice for people who aren't acquainted with advanced mathematics.

The Simple Plane Pendulum - This applet illustrates the simple plane pendulum, with or without damping. The user enters the damping coefficient and initial conditions, and the applet animates the pendulum's motion and plots the angular velocity versus the angle. Such a plot is called a phase portrait.

Coupled Oscillations - This applet illustrates coupled oscillations of a linear chain of identical noninteracting bodies connected to each other and to fixed endpoints by identical ideal springs. All bodies start from rest, and their initial positions can be set either by sliding them along the track