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Why are shoelaces always open?

When it comes to running, the shoelaces are always loose. I don't know why? Why are the shoelaces always open~

Foot movement, knot way, laces material, the above three factors together lead to our laces easy to spread.

Different knotting methods are also important reasons for loose shoelaces. The essence of tying shoelaces is to tie a single knot twice (it's just that when tying shoelaces, the second single knot keeps the pulling head, not tied).

The knot that is not easy to spread is a square knot (also called a flat knot), that is, a knot composed of two single knots in opposite directions. The knot that is easy to disperse is a pseudo knot (also known as a parallel knot), that is, a knot composed of two single knots with the same direction.

If you think the shoelaces are easy to loose, it's probably because the square knot is forged. In this case, as long as you change the direction of any single knot, you can make a square knot. If you want to tie the second knot, the first knot will be tight, and the second knot can't be too loose.

Now a lot of shoelaces are made of chemical fiber, which is very bulky. When the shoelaces are tied tightly, they will become loose. If you can replace it with cotton laces, it will not be like this! One is to tie a knot on the laces (bow is the best).

The second is to find two small nuts to wear on the shoelace, one on one side, and then tie it again, it won't open.

This is based on the principle of centrifugal force. Can also find some beautiful beads instead of nuts, easy to use and beautiful.

The researchers found that when walking, the combined impact and acceleration on a shoelace amounted to seven gravitational accelerations, which is about the same as the gravitational acceleration of Apollo spacecraft when it re entered the earth's atmosphere. Further experiments have shown that just stamping up and down is not enough to loosen the tie, or just swinging back and forth. Only the two forces can make the laces knot loose. With the change of the direction of the force, the laces are pulled continuously. This repeated impact eventually leads to the laces knot loose.