Scientists finally know the science behind why shoelaces come loose so quick | fashion and trends | Hindustan Times
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Scientists finally know the science behind why shoelaces come loose so quick

You can keep tying them as hard as you want but shoelaces have a way of coming loose anyway. Here’s why that happens.

fashion and trends Updated: Apr 12, 2017 21:01 IST
Shoelaces,Loose,Science
Why is it so hard to keep your laces tied while running?(Instagram/warplacesid)

Ever wondered what causes your shoelaces to loosen even when you tie them as firmly as possible?

It is because while running, the force of a foot striking the ground stretches and then relaxes the knot, a study has showed.

As the knot loosens, a second force caused by the swinging leg acts on the ends of the laces, like an invisible hand, which rapidly leads to a failure of the knot in as few as two strides after inertia acts on the laces.

The findings, published in the journal Proceedings of the Royal Society, may help understand things like DNA that fail under dynamic forces, the researchers said.

“When you talk about knotted structures, if you can start to understand the shoelace, then you can apply it to other things, like DNA or microstructures, that fail under dynamic forces,” said Christopher Daily-Diamond, graduate student at the University of California-Berkeley.

Using a slow-motion camera and a series of experiments, the researchers assessed a pair of running shoes that were laced-up and were on a treadmill.

They found that shoelace knot failure happens in a matter of seconds, triggered by a complex interaction of forces, as when running, the foot strikes the ground at seven times the force of gravity.

Naučite vezati perKle! #shoelaces #howtotieshoelaces #howto

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In addition, the study showed that some laces might be better than others for tying knots, but the fundamental mechanics causing them to fail is the same.

“The interesting thing about this mechanism is that your laces can be fine for a really long time, and it’s not until you get one little bit of motion to cause loosening that starts this avalanche effect leading to knot failure,” said Christine Gregg, graduate student at the University of California-Berkeley.

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First Published: Apr 12, 2017 20:48 IST