Careful. Trying to bring physics and biomechanics into the discussion can get a person in trouble......
That's subtle and funny....
I had the luck to join a Tomiki Aikido dojo where the 2 2nd highest dan grades were rocket scientists, literally. A couple of Ph. D. physicists at NASA here in Houston. Our head instructor, Raymond Williams, was told by one of them that he had the most instinctive grasp of physical mechanics he'd ever known. So, I've been talking about the physics of everything we do for quite a long time now, and it's natural. And, we also got great gems from the engineering world as well, such as "It's hard to push a rope," "Rocks roll downhill, nd they are hard to push back up that hill," things like that,.
They make you scratch your head when stated out of context like I just did above, but we use them all the time in discussions of how kuzushi is affected, posture gets broken, or not, by tori's movement/pressure, whatever.
Then, in the past 5 years or so I started working with Nick, who has brought great people like Howard Popkin and George Ledyard to OKC, and the biomechanics side of things (sometimes clothed in the Asian medical terminology) has showed up. Neat stuff. I just wish I understood it! Ha!
Good stuff for study for the next 10 to 20 years, eh?