I honestly don't know if that was sarcastic or not, lol. I'll answer as if I thought it wasn't.
I just think about these things, and how things like that relate to physics. I never realized it was relating to physics, but I remember I thought about things like that as soon as I got my first bike, when I was about 7. The idea wasn't as developed, that came from trial and error, and reading some.
Some of the parts of that are things that the chapters we were writing them on were about, so I used some of the concepts we learned.