Question

How is energy transferred when an iron nail is struck with hammer into a wall? ​

Answer 1

It is true that the hammer drives the nail into the wood only when it is lifted and then struck.

Analysis - The iron hammer on its own has no kinetic energy, but it has some potential energy (because of its weight). To drive a nail into the piece of wood (which is work), he has to lift the iron hammer up, (this increases its potential energy because if its high position) and force it to move at great speed downwards (now has kinetic energy) to hit the nail.

The sum of the potential and kinetic energy that the hammer acquired to drive in the nail is called the Mechanical energy, which results in the work done.

Answer 2

Potential energy of the hammer to the kinetic energy of the hammer to the kinetic energy of the nail to the mechanical energy of the wall in form of vibrations, wear and heat.

Explanation:

• When hammer is lifted we do some work and gravitational potential energy is stored in the hammer.

• When it is allowed to approach the nail it converts the potential energy in to kinetic energy.

• This kinetic energy of the hammer when struck on the nail converts into the kinetic energy of the nail in the impulsive manner.

• Now this kinetic energy of the nail pierces into the wall generating heat and causing vibration and wear in the particles of wall.

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TOPIC: energy transformation

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