Re: Tenkan and Centrifugal Force
IMHO, I accept that all theories are simply cognitive models to explain what is observed in nature. I also accept that those theories are useful no matter what label you put on them.
Entering and blending without resisting or interfering with the inertia and momentum of an approach or attack is useful. Redirect by utilizing the centrifugal force to pull the head into the center of the circular motion while using centripetal force to let the feet try to keep up on the circumference of the circular motion is useful to take balance (kuzushi). In a downward spiral motion it become a useful take down.
While this may not make sense or appear useful to some, it sure helped me get my head around it. And, wherever the head goes, the body tends to follow.