Hi Ric, >> So what quantity do we have that is mass times velocity.... but is clearly differentiates between each equal product... Well, mass times velocity is *momentum.* >> Clearly... 2 x 2 does not equal 4 x 1..... at least in the case of how much mass at what speed hits any given other mass. >> What quantity am I looking for here ? I'm not sure what you mean here. Kinetic energy, (mv^2)/2, perhaps differentiates, sort of, I guess, if I understand you correctly. Only you'd be looking at 2 x 2^2 / 2 being different from 4 * 1^2 / 2, etc. Is that what you mean? >> Well.. can see I will have to publish all the data I can get on this action. I will be taking it apart in the next few days so I have the opportunity to measure things for you. But as far as your last sentence there.... Evidently our friends at Steinway have come to this conclusion as well... we just had a long thread on Steinways new view on friction... and it was very much on the light side. Cool! It will be interesting to hear what you find! Where can I find out more about Steinway's new views? Which thread? (I don't read them all. Only so many hours in the day!) Peace, Sarah PS >>Yes... welll... now it seems to me that I have been basically right on target all along...except that I have been using the term inertia erroneously Hmmmmm.... MmmmmHmmmm... ;-) Physics is a bit more involved than most people think. Force, momentum, kinetic energy, velocity, etc. can't be scrambled about and still make any sort of sense. I think we could all stand to learn more about physics, myself included. It's fun stuff. You'll really enjoy it when you get into it more, especially with all the mathematics you're studying. Basic principles of calculus really make physics sing!
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