File:Types-of-rope-arcs-that-take-some-fibers-from-tension-service-leveraging-same-load-to-fewer-fibers-of-now-greater-tension resize1000px.png

English: Rope Arcs in round vs. flat rope(webbing) and different aspects of deforming from pure inline and how internally fibers that are compressed or neutral, logically can't be tensioned fibers holding load. Just contact frictions can distort rope on arc as the outer 'race' of the rope arc is rotated load direction as the inner 'race' of the rope arc is virtually torqued back the opposite direction taking a layer of rope contacted from service of tensioned load support, envision same internally if core is load bearing, On Arc webbing lays very flat with virtually no dimension on the deformed axis, where round rope stands taller away from host than flat webbing, so rope leveraged harder against rope itself, so carries less load before breaking. But, in knots, webbing weakens much more, as it scrunches it's crosswise width to massively deform. Another aspect is too tight a bight in round rope, and compressing hard a lump of rope that now can't be used for tension against load. To go from compression to tension, must have some neutral in between that itself is not tensioned to carry load, and is actually the leveraged distance between the compression and tension regions. resize1000px