You put on your shoes, tie them as firmly as possible, but soon after the laces come undone.
Now scientists think they know what causes one of life's knotty problems.
[...] The researchers say an understanding of shoelaces can be applied to other structures, such as DNA.
[...] They found that when running, your foot strikes the ground at seven times the force of gravity.
Responding to that force, the knot stretches and then relaxes.
As the knot loosens, the swinging leg applies an inertial force on the free ends of the laces, leading to rapid unravelling in as little as two strides.
related stories:
Untangling the Mechanics of Knots
Useful Dead Technologies Redux
(Score: 4, Interesting) by AthanasiusKircher on Thursday April 13 2017, @02:05PM (5 children)
People who don't double-bow are just wasting their time.
Are you sure you're tying the "single-bow" correctly?
It's surprising, but a large percentage of people tie their shoes the "wrong way." Yes, there is a significantly more and less effective way of creating the standard "bow" knot, which just depends on which way you go around the loop. It's sort of similar to the difference between a "square knot" vs. a "granny knot": one will remain relatively tight under stress, while looping the other way will lead to the knot slipping over time.
See video and discussion here [gentlemansgazette.com] for example. Or this very short TED talk [ted.com].
Seriously. For all of you who have never heard of this, check and make sure you're tying the knot correctly. I discovered this a few years back, and once I switched looping directions, my knots almost never come undone, even without double-knotting.
(Score: 3, Informative) by draconx on Thursday April 13 2017, @02:35PM (1 child)
My shoes came with round laces, which I found would tend to work itself loose even when the regular shoelace knot is tied correctly.
I now normally tie Ian's Secure Shoelace Knot [fieggen.com]: which is almost as easy to tie, and has never come undone, except when I want it to (in which case it comes undone easily).
(Score: 0) by Anonymous Coward on Thursday April 13 2017, @03:33PM
Just tried it. That's handy!
(Score: 2) by acid andy on Thursday April 13 2017, @07:53PM
I tie double reef bows and, sometimes, out of sheer exasperation, triple reef bows, yet they still seem to come undone much more often than I would like! I wonder if it's slipperiness of the modern lace material that's partly to blame.
If a cat has kittens, does a rat have rittens, a bat bittens and a mat mittens?
(Score: 2) by CoolHand on Thursday April 27 2017, @01:02PM (1 child)
Anyone who is capable of getting themselves made President should on no account be allowed to do the job-Douglas Adams
(Score: 2) by CoolHand on Thursday April 27 2017, @01:04PM
Anyone who is capable of getting themselves made President should on no account be allowed to do the job-Douglas Adams