Q46 of 100 Page 231

Why is it difficult to light a matchstick by striking it on a smooth surface ?

The smooth surface offers very less friction, due to which very less heat is produced by it and it is not sufficient to lighten up the matchstick.


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Explain why:

(a) A pencil will write on paper but not on glass.


(b) climbing a greasy pole is very difficult.

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