Question

A nail becomes hot when hammered in a plank:

• A. the potential energy of hammer changes into heat energy
• B. the kinetic energy of the hammer changes into heat energy
• C. the force of friction changes into heat energy
• D. none of the above

Answer 1

The correct option is B

the kinetic energy of the hammer changes into heat energy

1. The potential energy of the hammer is transferred to the nail.
2. A major part of this energy is changed into kinetic energy as the nail moves into the plank and the rest is converted into heat energy.
3. It is due to this heat that the nail becomes warm.

Hence, the correct answer is option (B) i.e. the kinetic energy of the hammer changes into heat energy