Niels wrote >I put "weight" between quotes, because actually we're little interested in weight or mass. We're interested in _force_. After all: Energy = distance * force. We're really only interested in the _force_ that your hands and paddle generate when going down and the force that's needed to counter that force to move your arms up. That force is shown when you put both hands and paddle on a scale. > G'day Niels, Now I understand why you and Matt thought my calculations were so complicated. I may think about the forces involved but I don't involve force in my calculation at all, just work with mass and vertical displacements, together with potential energy, kinetic energy and their differential with time. Trivial calculations and they simplify things enormously. For example I don't have to worry about acceleration and it tells me straight away why Matt's measurement of arm 'half' weight supported by a set of scales and a shoulder, will still allow a valid calculation. The penalty is that I learn nothing about the forces used, just the power and the energy. But I agree many of the forces involved in this context are way too uncertain to allow calculation. Mark, Brad, Craig and Scott had me laughing out loud - Is it possible that we might finally be boring people to tears and it's time to stop - surely not:~) All the best, Peter *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed May 04 2011 - 20:18:40 PDT
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