I didn't know Flash was so complicated...But good Job on the Tutorial! It's perfect, except that the next and previously buttons were a bit small...
T_T no no no no no no no
if i wanted to learn this i could got to a high school then to a gate class DX
when i clicked on this i was like,"yes, i can understand this!". then , i was like >_<???
It's a good explanation of basic physics.
My only real criticism is the way you handled the circles radius (by adding an invisible outline to all other objects), I just found that this was a very in-elegant solution because it only works as long you only have 1 sphere (or more if they ignore each other).
Apart from that , very nice tutorial.
This is perfect! If only I was as smart as you :D You are now my favorites!