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Examples

Here are some demo programs created with EJS, just to give you a flavor of the type of simulations you can create with it.

Physics

• Cart pulled by a string?: A cart is tied to a weight that falls.
• Throwing a ball?: Parabolic throw.
• Collisions in one dimension?: A front collision between two planar disks.
• Multiple collisions?: A simulation of 2D collisions among multiple planar disks.
• Planetary motion?: A Sun and planet, two-body problem.
• Metallic conductor?: How can a lot of loose electrons cause a metal to be a good conductor?
• Lorentz force?: A simulation of the force exerted by a magnetic field on an electrical current trough a wire.
• Transmission line?: A very sophisticated simulation of a transmission line.

Chemistry

• Brusselator?: A chemical reaction with oscillating dynamics. JAR. XML.

Biology

• Lotka-Volterra?: A predator-prey model. JAR. XML.

Mathematics

• Arenstorf orbits?: Arenstorf orbits are closed trajectories of the restricted three-body problem. JAR. XML.
• Lorenz attractor?: The three-dimensional Lorenz attractor shows the sensibility of simple non-linear ordinary differential equations to initial conditions. JAR. XML.
• Planet choreographies?: Curious planar trajectories of n-bodies under mutual gravitational attraction. JAR. XML.
• Vibrating string?: We solve the one dimensional wave equation using an explicit difference method to display a vibrating string. JAR. XML.
• Poisson equation?: We solve Poisson partial differential equation in the plane, using the relaxation method, to display an electrostatic field. JAR. XML.
• Heat equation?: We solve the one dimensional Heat partial differential equation, using the method of lines, to display the flow of heat in a thing metal bar. JAR. XML.

Examples with the new 3D visualization (To be released late 2009.)

• Earth and Moon in 3D?: The moon revolving around the Earth.
• Furuta Pendulum in 3D?: A Furuta pendulum.

More examples:

• Links to examples created by other people
• The EJS distribution includes a lot of additional examples.
• If an Internet connection is available, from the EJS' interface you can connect to on-line digital libraries with dozens (if not hundreds) of examples.