It's time to waste spaghetti time again.
has previously introduced a very interesting phenomenon in life: holding a slender spaghetti from two segments will always break into at least three pieces.
this phenomenon occurs on slender objects that are elastic and easy to break. when the first fracture is formed, the broken end that has accumulated elastic potential energy will rebound quickly. and cause a new break in the rebound swing (more reading: cold knowledge: breaking a piece of spaghetti, how many pieces will it break? )
and recently another paper pointed out that it is actually possible to hold both ends and fold the long spaghetti in half. The way to achieve this is to twist and then fold, first let the noodles twist at least 270 °, and then slowly bend it, so that only one fracture can be produced.
(actual twisting and breaking of spaghetti, high-speed photography)
this study was initiated by two MIT students who built special machines to twist spaghetti and carried out computer simulations to test their hypotheses. The experimental and calculation results show that after the first fracture, torsion can help to release energy and avoid excessive local accumulated stress, thus avoiding the occurrence of secondary fracture. For Barilla's No. 5 and No. 7 spaghetti, this method is very successful.
(the spaghetti machine they use for experiments. (it looks like this)
but I tried it, and I found it difficult to twist the spaghetti by hand, and it was easy to break the noodles in the hand-held place. At least I haven't succeeded yet
related reports: http://news.mit.edu/2018/mit-mathematicians-solve-age-old-spaghetti-mystery-0813
's amazing paper has been published on PNAS. If you are interested, you can learn more about it: http://www.pnas.org/content/early/2018/08/09/1802831115
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