Basic physics to make flash actionscript2 game?

Basic physics to make flash actionscript2 game?
I want to make a physics based flash game, although I haven't taken a formal physics course and barely know anything about physics and mechanics. I want to make it very realistic, but the calculations and geometry (especially implementing them in Actionscript2) seem extremely complicated as there are literally hundreds of variables to account for, which are all also interdependent upon each other, if you want to make it realistic.
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