Spherical Pendulum models a particle under the influence of gravity that is constrained to stay on a spherical surface. The simplest example is that of a pendulum that is free to swing in any direction. This problem is most conveniently solved using spherical coordinates where is the radius, it is the angle the pendulum makes with respect to the vertical z-axis, and f is the rotation angle about the z-axis. These polar coordinates are converted into Cartesian (x, y, z) coordinates after every time step to position the pendulum bob in a three-dimensional Ejs world view.

Ejs Spherical Pendulum model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_osc_Pendulum3D.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models for Newtonian mechanics are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Requirements:
* Java

The license of this software is Freeware, you can free download and free use this graphing software.