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Re: [Phys-l] Food Liar's calorie chart



Stefan Jeglinski wrote:

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?

Here, the dominant effect is the rhythmic contraction of various muscles which augment the energy converted to heat and to pumping blood to the brain.

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.

Stefan Jeglinski
Brian W