why is it difficult to hold a School Bag having a strap made of a thin and strong string
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It's all because of increased pressure . Because of the law area decreases and pressure increases.
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It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite large. ... In the case of a thin strap, the contact surface area is very small. Hence, the pressure exerted on the shoulder is very large.
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