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Bottom line Mother Nature does not supply a free lunch. Work performed 
on an object (like you feed bag of a rider on the back of a horse) is 
the product of the distance the object is moved through a force and the 
force it is moved through. For a complicated path like going down the 
trail, you break the path up in a bunch of little pieces and sum up the 
energy over each piece. That means that no matter what the source of 
mass, dead mass or moving mass, the amount of work is the same. A 
posting rider - even the worlds greatest rider - does not change the 
force the horse has to move the object through since when the horse 
"pushing" the rider up they accelerate it - increasing the force the 
object is moved through. This is not offset by the rider easing back 
down on the back since nothing is 100% efficient. Mother Nature is not a 
nice lady - she gets hers. Hence work is directly proportional to mass, 
dead or alive. Double the mass - you double the work required to move it.

Energy required is directly proportional to mass - double the mass and 
you double the energy required to move it. Double the speed you 
quadruple the energy required to move it.

That's pretty much high school physics - at least when I was in high 
school.

Truman

Paul Sidio wrote:
> This experiment leads me to the conclusion that weight does matter 
> over distance. We can compensate for this it through training and 
> preparation, but gravity never quits. It doesn't care what muscles you 
> use and for how long and if you are on the flat or in the hills... 
> gravity sucks.

--

“With or without religion, you would have good people doing good things 
and evil people doing evil things. But for good people to do evil 
things, that takes religion.” Steven Weinberg – Nobel Laureate, Physics


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