Mathematics Tutorials - Simple Harmonic Motion
Simple Harmonic Pendulum 
Using the mouse, drag the pendulum to the side and release. The pendulum should exhibit simple harmonic motion (SHM).
Entering a number will change the length of the pendulum. Moving the pendulum with the mouse puts a new length in the text box.
Source: Pendulum.java
Simple Harmonic Spring
This Java applet demonstrates the variation of elongation(displacement), velocity, acceleration, force and energy during the oscillation of a spring pendulum (assumed with no friction).The "Reset" button brings the body of pendulum to its initial position. You can start or stop and continue the simulation with the other two buttons. If you choose the option "Slow Motion", the movement will be five times slower. The spring constant, the mass and the amplitude of the oscillation can be changed within certain limits. In order to select another physical size you have to click on the appropriate one of the five radio buttons.
Source: Federpendel.java
Further Examples of Simple Harmonic Motion
 Summary Notes on SHM
 Simple Harmonic Motion
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