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प्रश्न
Take two pieces of smooth paper and two of sandpaper and rub them against each other. What do you notice?
दीर्घउत्तर
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उत्तर
When we rub two pieces of smooth paper against each other, they slide rather easily because there is less friction between their surfaces. However, when we rub two pieces of sandpaper against each other, they do not slide easily because their rough surfaces produce more friction. Thus, rough surfaces offer more friction than smooth surfaces.
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