Need To Know

Why do knots weaken a rope?

Anyone who relies on the strength
of a rope takes great care to prevent
knots forming in it, as they can reduce
the breaking strength by more than
50 per cent. The reason is that knots
create curved regions of rope whose
outer circumference is greater than
the inner part. This difference in
length creates stress across the
rope’s width when put under tension,
undermining its strength.