How does hammering a iron sheet again and again increase it's temperature?
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This action do not increase its temperature due to friction between hammer and iron sheet it gets heated.
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A nail becomes warm when hammered into a plank because every time the hammer hits the nail, the kinetic energy of the hammer gets transferred into the nail.this energy transfer is seen through the motion of the nail into the plank, the sound that is created every time the nail is hammered and the heat produced, i.e., the nail becoming warmer.
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