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  4. When we rub two flint stones together; we got them to heat up and to ignite a heap of dry leaves in the form of

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Q. When we rub two flint stones together; we got them to heat up and to ignite a heap of dry leaves in the form of

Work, Energy and Power

Solution:

One of the greatest technical achievements of human kind occurred, when we discovered how to ignite and control fire .
We learnt to rub two flint stones together (mechanical energy), got them to heat up and to ignite a heap of dry leaves (chemical energy), which then provided sustained warmth.