Why steel head of a hammer can become warm when it is used repeatedly to hit nails into wood?

Friction.





As Simple As That.Why steel head of a hammer can become warm when it is used repeatedly to hit nails into wood?
the first answer is partially correct but you also need the added friction of the air as the hammer goes thru it.Why steel head of a hammer can become warm when it is used repeatedly to hit nails into wood?
In a word, friction.
compression and friction make ';Heat energy';, Thats why Diesel engines have no spark plugs, the compression is so great in the cylinder that friction occures lighting off the fuel air mix, and this keeps it running.
FRICTION! When the hammer hits the nails it ';jolts'; the atoms, if you repetidly hit it then it will create energy and in return heat!
as atoms from the metals are activated by hitting.