WaveAdd

A simulation that adds two waves (longitudinal or transverse... sine, square, or triangle) and shows their sum.
Each wave's frequency, wavelength, speed, amplitude, shape, and orientation can be changed on the fly.
Easily show superposition, beats, and standing waves.
Constantly updated values for x position, y position, velocity, and acceleration describe each wave, and their sum.
Unit circles show the formation of transverse sine waves. If there are two such waves, their phase angle can be shown.
The simulation can be slowed or stopped, and the waves can be merged.