Q&A/Class 8/Science

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Class 8CBSEScienceChapter: Force and Pressure
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It is difficult to hold a school bag having a strap made of a thin and strong string because it applies the large pressure on the shoulders due to very small contact surface area. The pressure is inversely proportional to the surface area on which the force acts. Therefore, pressure decreases if surface area increases.

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