“Playing with Physics” apps allow interactive simulation of select physics phenomena.

The “Stationary Waves” app allows you to plot the time course of a stationary wave created by the interference of direct and reflected waves at a fixed or free end. The user can specify the method of attachment to the point series at the left or right end and the length of the standing wave in multiples of the wavelength. User can toggle display of stacked waveforms on and off. The ripple can be stopped and started again at any time.