How to calculate gravity?

How to build a simulator?

Here is a list of some interesting resources on the internet

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Quantum physics simulator and education

This link contains an java-script simulators and visualizations for well-known experiments in quantum physics:

http://www.st-andrews.ac.uk/physics/quvis/

It explains how to set up the experiment, how to do the calculations,

and what you can expect if you change certain parameters.

I like it because it helps to link the experiment directly with the calculations.

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Programmer created lots of animations and simulations

This link contains many simulations, demonstrations and artwork:

http://www.bugman123.com/Physics/index.html

-Magnetics

-Quantum physics

-Special relativity

-Pool (game) simulations

-Collisions

-Refractions (of light)

-Photon sphere

-Einstein ring

-Galaxy gravity

-Lagrange points

-Hydrogen orbital distribution

Many will not contain actual simulations, but follow predetermined mathematical patterns.

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Orbital Mechanics

This links explains how to calculate the orbit for a satellite:

http://www.braeunig.us/space/orbmech.htm

- lots of interesting formulas.

(no relativity)