Sigh. Look you can say what you like but it is the imbalance of force
between the centrifigal and gravitational forces that causes the two
tides. Now you can a call that "differential gravity" but why? Doesn't
that lead to the confusion that is so apparent? For the last time,
gravity, as a perectly defined force, only acts toward the center of the
system, it cannot _by itself_ produce two tides. If gravity alone could
do it why is the rotation of the system important (what happens in free
fall?). Have a look at the teaching site I posted for a clear simple
explanation.

That's all I'm going to say on this subject.

Cheers


Peter S/Y Anicula wrote:


P.S.
The problem is not that I don't understand the math or "your" model, I
think I do, and in some contexts I even prefer it, but the problem
aparrently is that you don't understand the differential gravity
explanation.