@darknezz:Your explanation of gravity is pretty off. Gravity is not a theory, its an observable phenomena that we have developed a theory to try to describe, the theory of gravity. Its actual existence is not theoretical, but the exact manner in which is operates is.
Also the equation for gravity that you described is entirely incorrect. The real equation is pretty simple, just F = G*M1*M2/r^2, where F is the force, M1 and M2 are the masses of the two objects, and r is the distance between them. G stands for the gravitational constant, which is not 9.2m/s^2 but actually 6.67408 × 10-11 m3 kg-1 s-2
I'm not really sure where you got 9.2m/s^2 from, but 9.81m/s^2 is pretty close to the force of gravity you would receive on Earth, which you could calculate with an equation similar to the one I provided above. This changes slightly depending on where on the Earth you are, due to its nature as an ellipsoid.
I don't want to be crass, but all of this is explained in a highschool physics course, and you were pretty much entirely incorrect.
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