[at-l] [Fwd: ScienceDaily: Bungee-powered Backpack Can Lighten Your Load, ...

[RoksnRoots at aol.com]

In a message dated 1/5/2007 9:00:13 AM Eastern Standard Time, 
jim.bullard at gmail.com writes:
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As
you walk, you and the frame move up and down slightly but the spring
mounted pack stays at the same level relative to the ground so you get
the advantage of not lifting that weight each time you go up or having
the weight shock to your knees each time you come down.
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          The way physics works is this shock absorption may allow a smoother 
ride but you are still going to have to heft the weight as it reaches the 
bottom of the bungee stretch and hits bottom. This will still involve "slung" 
momentum rather than the direct lifting of a conventional pack. So you are 
lifting the weight after being dampered - but still lifting it. The absorption 
doesn't make weight disappear.






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