Explain the cause of shoelaces or slip

American scientists find the real reason why the shoelaces are always slipping away, no matter how tight the user is.

Researchers in the city of Berkeley, California, USA use accelerometers to record human movement to find out why the shoelaces are loose and slip off the original knot, Live Science April 11 reported.

Oliver O'Reilly, research co-author and mechanic professor at the University of California, Berkeley, and colleagues borrowed a high-speed camera and recorded colleague Christine Gregg's shoelaces as she ran on a training machine. run.

Shoelaces often slip during movement.(Photo: Assets).

"For a long time nothing happened. Then suddenly the shoelaces slipped quickly, making us really surprised," O'Reilly said.

The team found that human walking and running created a force seven times greater than gravity (7G) . "Your shoelaces are affected by this force with each step , " O'Reilly said. For comparison, the world's most powerful roller coaster, called the Fear Tower in Johannesburg, South Africa, produced only 6.3 G forces . "And your shoelaces are constantly bearing this with every step , " O'Reilly said.

Under the repeated action of the running steps, the knots begin to deform and loosen. At the same time, the bow tie and the end of the rope flapped and then slipped through the knot like it was pulled out.

"The buddhist movement really boosts inertia on the shoelace. It significantly increases the imbalance. Next, the shoelaces are pulled out and eventually slipped, " O'Reilly explained.

The researchers found that within 15 minutes, all loose knots were slipped while some tightened knots also shared the same fate.