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Berkeley engineers explain why shoelaces come undone while running

Original: 👟 ICYMI: Mechanical engineers at # UCBerkeley studied why shoelaces come undone on their own while # walking or # runnin

Mechanical engineers at the University of California, Berkeley have worked out why shoelace knots fail on their own during walking and running. Using high-speed cameras and pendulum experiments, they found that repeated foot strikes loosen the center knot, while the swinging of the legs whips the loose lace ends around until the knot unravels completely.

Why now: The counterintuitive physics of an everyday annoyance continues to interest science-minded readers sharing the study.

University of California, Berkeley

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Evidence

• 👟 ICYMI: Mechanical engineers at # UCBerkeley studied why shoelaces come undone on their own while # walking or # running . High-speed cameras and pendulums show that repeated foot strikes loosen the center knot while leg swings whip the loose aglet ends free, triggering total… · tksst@fediscience.org · 6

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