James, I guess that you mean that inertia is reflected (or the expression of) by the force required ..etc . Is it difficult to use a more precise term or is it really better for all of us to admit the use of the word inertia while understanding resistance ? > Inertia is the force required to accelerate or decelerate a > mass. There are a variety of ways we can say this. A fly-wheel has the > same inertia whether it is spinning or stationary. However, if we have > a stick that we are going to hold by the end, and swing back and forth, and > we have a mass that we can clamp at any location out on the stick, then > the "moment of inertia" of that mass (just the mass, not the stick) will > be proportional to the square of the distance between our hands and the > mass. May be I am only making intellectual remark , may be it is not at all annoying to use that word in a common sense, but may be it can induce reasoning errors later, I don't know. I for one understand what you mean (I guess). The only comment I can make at these days on keys that are leaded so to have a lower moment of inertia, is that I feel (when playing) the key as having a different compliance than the rest of the action -and may be that is for other reasons (flex, etc) In the same way assist springs seem to induce less coherence in the action leverage (from a kinetic point of view) A little in the same way a mismatch between hammer's weight and leverage gives me the impression of incoherence at the hammer/shank part of the action. Well I also have beaten to death these point of view, I'll stay quiet and try to follow the remaining now .>) Best Regards. Isaac > > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives
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