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Re: [j_ung] Stretchy terminology:
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jt512
Jun 3, 2010, 3:05 PM
Views: 4308
Registered: Apr 12, 2001
Posts: 21904
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j_ung wrote: I think we've established over and over again that "absorbs force," is technically incorrect to describe what happens when rope stretches during a fall. So, what exactly is the correct terminology to denote what a dynamic rope does? Is it "dissipate energy?" "Eat force and poop energy?"
The rope stretches, converting the kinetic energy of the falling climber into strain energy in the rope. So, saying that the rope "absorbs" energy (as opposed to force) is not too far off the mark.
The reason that a dynamic rope reduces the impact force on the climber, relative to a static rope (or the ground), is that force F is proportional to acceleration a:
F = ma ,
where m is mass (of the climber).
The stretchier the rope, the smaller will be a; and the smaller a is, the smaller F will be. A dynamic rope is stretchier than a static one; therefore, by the above argument, the impact force will be lower for a dynamic rope than a static one, all else equal.
Jay
(This post was edited by jt512 on Jun 3, 2010, 3:43 PM)
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Post edited by jt512
() on Jun 3, 2010, 3:43 PM
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