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The Science Behind Shoelaces Coming Untied

机译：鞋带背后的科学解开

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Many of us must have experienced accidental untying of our shoelaces while running or playing in our childhood. Athletes and those engaged in sports activities also face the problem of shoelaces spontaneously coming untied, often at the most inopportune time. But despite the problem being so common, little was known and even less was documented about the physical mechanisms responsible for this persistent problem, although there have been some interesting observations. For example, it has been found that a shoelace knot that often came loose very quickly when walking (typically within 15-20 metres) did not fail when the leg was simply swung back and forth a similar number of times, while sitting at one place without stomping the foot on ground. Again, simply stomping the foot on the ground the same number of times without swinging the legs also did not lead to untying. It was clear that for the shoelace knot to come untied both swinging of the feet and stomping on the ground was necessary. In other words, it involved interplay between the forces generated in the swing and stomping of feet during the walking or running motion. Recently, a team of engineers of the University of California at Berkeley have come out with a scientific explanation of the phenomenon. Their study suggests that a combination of stomping and whipping forces acts like an invisible hand, loosening the knot and then tugging on the free ends of the laces until the whole thing unravels (Proceeding of the Royal Society A: Mathematical, Physical and Engineering Science, 12 April, 2017 | DOI: 10.1098/rspa.2016.0770).
机译：我们中的许多人在童年时期跑步或玩耍时都必须经历过意外地解开鞋带的情况。运动员和从事体育运动的人也常常在最不合时宜的时间面临鞋带自发解开的问题。尽管存在许多有趣的发现，但是尽管存在着如此普遍的问题，但对于造成这一持续性问题的物理机制知之甚少，甚至文献记载也很少。例如，已经发现，在走路时（通常在15至20米之内）经常快速松脱的鞋带结并没有发生故障，而只是将脚坐在一个地方来回摆动了类似的次数不会踩脚。再次，简单地将脚踩在地面上相同的次数而不会摆动腿也不会导致解开。显然，要使鞋带结解开，必须同时摆动脚和踩踏地面。换句话说，它涉及在步行或跑步运动期间在脚的摆动和踩踏时产生的力之间的相互作用。最近，加州大学伯克利分校的一组工程师提出了对该现象的科学解释。他们的研究表明，踩踏和鞭打力的组合就像一只看不见的手，松开结，然后拉扯鞋带的自由端，直到整个东西都散开为止（皇家学会A：数学，物理和工程科学， 2017年4月12日| DOI：10.1098 / rspa.2016.0770）。

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    《Science and Culture》 |2017年第8期|258-259|共2页
  • 作者

    Biman Basu;

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