What you all are talking about has nothing to do with kinetics, it's about hydrodynamics: The planning monohulls are flat in the back and v-shaped in the front, if there is enough wind, you move the weight back, so that only the flat part of the hull is in contact with the water. Then you get the boat planning and going much faster, because the HYDRODYNAMICS are optimal. The movement of your weight to acheive that is on the field of statics, not kinetics. Capisci??
Maybe the water inside the hull stuff has to do with kinetic, i didn't understand that, but for sure it's not as exciting as planning.

What about cats? don't know, havn't sailed my new cat yet...
I guess there is no planning, but the cat will go faster anyway, so does it matter? Probably yes, when you get a monohull planning, like a LaserII, it is really FUN..