Is it true that a nail becomes warmer when hammered into a plank?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
When we hit the nail with a hammer, the kinetic energy due to the motion of the hammer is transferred into the nail. Some of this energy is transferred as it is to the nail(e.g.:- kinetic energy of the nail), while some energy is converted into heat due to friction. Due to this, the nail becomes warmer.

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