Question

how is friction used to generate fire?

Answer 1

Get 2 stones. Start rubbing them against each other. You apply energy while rubbing the 2 stones. Where does this energy go? The friction converts your energy into heat energy. For the combustion, oxygen comes from air and friction provides the heat and then fire is generated!.

Answer 2

Answer:

The friction occurring between them generates heat energy and if there is enough heat energy the wood at that point may smoulder and eventually catch fire. ... You have to move then very fast to prevent them cooling down faster than you can inject energy.