How can you start a fire using a hammer and an anvil
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referring to the clip u/JerseyWiseguy linked, whenever energy is released, some of it always is converted to heat, the lowest form of energy.
As the hammer repeatedly strikes the equally hard anvil and the rod in between, some of that kinetic energy used to swing the hammer is being converted to heat on impact. Metal tends to conduct and retain heat very well, so that rod is gaining heat with each strike faster than it loses heat.
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