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Originally Posted by Sisco
"In physics, moving a 100-pound weight 12 inches is the same amount of work as moving a 200 pounds 6 inches. Both of the above examples are also equal to moving a 400 pound weight 3 inches".
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this is what happens when people fall asleep in physics class. This only works for linear movement. There is not one movement in any exercise that you will ever do that is "linear". everything is an angle of something and the muscles in the body are not at maximal strength at every step of the way. If that was the case then do a set of curls with this logic and you won't be able to move the bar from rest position if you where to quadruple the load and only lift it a 4th of the way or what ever is "logic" is.