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Equating body weight with force in the direction of displacement
is suspect on the face of it
How so? We do it all the time to incorporate friction in kinematics (factor mu, normal force [weight], direction in the line(albeit against) of displacement). Here the dominant effect, to get the walker walking or the jogger jogging, is friction of the shoes against the walking/running surface.We, Kimosabe?
it is F.x that determines the amount of energy expended.Life-forms don't quite follow this relation, which works rather well for all too solid masses of other kinds.
Brian W
Stefan Jeglinski