Question

mrs. sharma had four old kitchens knives she observed that all the knives were blunt and could not be used she want to the market to get the knives sharpened she noticed sparks flying out when the knives were being sharpened on vastly rotating stone what could reason behind this
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Answer 1

Answer:

Friction

Explanation:  In stone age times people used to rub 2 stones together creating friction, thus making a spark to create fire

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