The reverse forge technique usually involves compressing air rapidly to ignite tinder.

However, an alternative method uses a hammer, nail, and anvil. By striking the nail against the anvil with a hammer, friction generates heat, allowing the nail to ignite nearby materials like paper and wood.

This process demonstrates the conversion of mechanical energy into thermal energy through frictional heating, making it a valuable survival skill for starting fires without matches or lighters.

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https://m.primal.net/IeWj.mp4

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Discussion

Alot more energy spent swinging that hammer than striking flint / quartz against HC steel.

You generally want to conserve your energy.

That said it is still worth knowing.