Physics trips up efforts to keep shoelaces tied

Mix of inertia and pavement pounding loosens knots, sends ends flying

running screenshot

KNOT BAD  Shoelace knots don’t unravel at random. Instead, as a runner jogs, the ends of her laces swing due to inertia, and the knot deforms from the force of each footfall. Both effects cause the knot to untie.

C.A. Daily-Diamond, C.E. Gregg and O.M. O’Reilly/Proceedings of the Royal Society A 2017

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