Q50 of 100 Page 231

What happens when you rub your hands vigorously for a few seconds ? Why does this happen ?

By rubbing our hands against each other we create friction between our hands and this friction produces heat. Therefore, out hands become warm.


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Explain how, friction enables us to walk without slipping.

 52

Which is easier to hold in hand: a kulhar (earthen pot) or a glass tumbler? Why?