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I don't understand why a rope doesn't untwist when an attempt is made to increase its length. It seems counter-intuitive to me, because untwisting would allow the rope to increase its length, but in practice it does not untwist. Do the braids spiral-like shape and the friction between the braids prevents this from happening ? |
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Have a look at http://usscouts.org/scoutcraft/BoyScoutRopemaking.pdf When you make a rope the individual fibres are twisted before you combine them into the rope. It's the "untwisting" force of the individual fibres that locks them together in a rope. You're quite correct that if you try to make a rope without twisting the fibres your rope will just fall to bits. |
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