I'd like to present some Java applets of simulations on physics in this page. These are very easy to use just like toys. Let's enjoy them.
Docking with a space station
Conservation of Mechanical Energy
Satellite of cannon ball
Let's play with a planet
Let's make a solar system (with sorce code)
Let's play with three balls connected with each other by rubber strings just like Quarks.
Let's play with colored balls just like Quarks(a variation of the former)
How can we see the structure of atom?
Motion of Ideal Gas Molecules in a cylinder
Billiards of Molecules (What's the difference of gas, liquid and solid)
Let's study about waves
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Go to Nori's personal computer physics