Ct, Altho I am currently a partisan of direct- and idler-drive turntables, I would nevertheless take those data you quoted (0% speed deviation at 5 kg.cm) with a grain of salt. The Technics uses a servo to keep speed stable, but a servo is not perfect in terms of avoiding "micro" changes in speed that it then has to correct for. So "average speed" may indeed not vary, but the devil is in those corrective measures mediated by the servo to keep the speed stable. The jury is out as to whether we can hear that happening. Some claim that they can. BD turntables pose entirely different problems as regards speed stability at the micro level. Some of us can hear that, too. Pick your poison.
kg.cm (kilogram X cm) must be a unit of Work or Energy. Work is defined as Force (F) acting through a distance (s); W = F(s). Kilogram is formally a unit of mass, but by convention we also refer to it as a unit of weight. Weight is mass X acceleration due to gravity (W = m(g)). The analogy to F = ma is obvious. So "weight" is actually an expression of force. That's what they taught me in college. It's a bit confusing, but I think that kg.cm is a unit of Work. (I've just been reading a book about how Einstein interpreted Newton, so I have been thinking about this stuff.)
kg.cm (kilogram X cm) must be a unit of Work or Energy. Work is defined as Force (F) acting through a distance (s); W = F(s). Kilogram is formally a unit of mass, but by convention we also refer to it as a unit of weight. Weight is mass X acceleration due to gravity (W = m(g)). The analogy to F = ma is obvious. So "weight" is actually an expression of force. That's what they taught me in college. It's a bit confusing, but I think that kg.cm is a unit of Work. (I've just been reading a book about how Einstein interpreted Newton, so I have been thinking about this stuff.)