[gtc]

My high school physics class used that teaching method - we basically derived the formulas ourselves for gravity, etc...
It was a complete disaster. It took forever, and we wound up covering only a fraction of the typical HS physics curriculum.
Luckily I didn't need it as a pre-req for college. I caught up easily in Phys101.
If my math classes had been taught that way, however, I could and would not have gone into engineering.