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Why do we bend a book to keep it straight?
I noticed that I have been bending my book all along, when I was reading it with one hand. This also works for plane flexible sheets of any material. Illustration using an A4 sheet Without bending the sheet: With a bend along perpendicular axis How do you explain this sturdiness, that comes only when the object is bent along the perpendicular axis? I feel that this is a problem related to the elastic properties of thin planes. But any other versions are also welcome.
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