Why do ow dunk's shoelaces loosen easily?

1, simply stomping up and down is not enough to untie the shoelaces, and so is swinging back and forth. Only when two forces interact can the shoelace knot be loosened. With the change of stress direction, shoelaces are constantly pulled, and this repeated impact will eventually lead to the loosening of shoelaces.

2. The resultant force on the shoelace knot suddenly loses control, making the shoelace loose all the time.

3. When people walk, the impact force and acceleration on a shoelace add up to 7 g, which is almost equivalent to the gravity acceleration when Apollo spacecraft re-enters the earth's atmosphere, resulting in the old shoelace.

Extension: 1 Actually, when we usually tie this shoelace, we usually use this bow tie method. It is very quick and simple to tie shoelaces in this way, but it is very easy to loosen shoelaces in this way.

When we tie this knot, we tie it like this, and tie a bow on the original basis.

3. Run one more lap. In this way, the shoelaces will be very firm, and no matter what strenuous exercise you do, it will not be easy to loosen.

4, and in this way, when you untie your shoelaces, you can easily untie them by pulling as usual. This method is very fast and firm. With this method, you don't have to worry that your shoelaces will come loose during exercise.