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Chapter 3: Problem 35

Why does a nail become hot when it is hammered into a piece of wood?

Short Answer

Expert verified
The nail becomes hot due to the kinetic energy from the hammer being converted into heat through friction.

Step by step solution

01

Identify the Interaction

When the nail is hammered into the wood, there is a physical interaction between the hammer, nail, and wood.
02

Understand Energy Transfer

The kinetic energy from the hammer is transferred to the nail. This energy is due to the motion and force of the hammer striking the nail.
03

Explain the Conversion of Energy

The kinetic energy transferred to the nail is converted into heat energy due to friction. As the nail is driven into the wood, the particles in the nail and wood collide, creating friction.
04

Describe the Result of the Process

The friction between the nail and the wood generates heat, causing the temperature of the nail to increase. Thus, the nail becomes hot.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Kinetic Energy
When you think of kinetic energy, imagine something moving. It's the energy an object has because it's in motion. For example, when a hammer moves to hit a nail, it possesses kinetic energy. The faster the hammer moves, and the heavier it is, the more kinetic energy it carries. This is because kinetic energy depends on both speed (velocity) and mass.
To put it in formula terms:
\[ Kinetic \, Energy \, (KE) = \frac{1}{2} mv^2 \]
where _m_ is the mass and _v_ is the velocity.
So, when the hammer hits the nail, all that kinetic energy gets transferred to the nail, making it move into the wood.
Energy Transfer
Energy transfer is the process of moving energy from one object to another or transforming it into another form. In the case of hammering a nail, the energy transfer is straightforward. The hammer, full of kinetic energy from being swung, hits the nail. When this impact happens, the energy from the hammer doesn't just disappear. Instead, it transfers to the nail. This is a classic example of energy transfer where the hammer's kinetic energy is now pushing the nail into the wood. This action not only moves the nail but also converts some of the kinetic energy into other forms, as we'll see next.
Friction
As the nail moves into the wood, it pushes against the tiny fibers and particles in the wood. Now, these particles don't just sit there; they resist the nail's movement. This resistance is what we call friction. Friction is a force that tries to stop one object from moving against another.
Think of it like rubbing your hands together. When you rub them fast and hard, they get warm. The same principle applies here. As the nail is driven into the wood, friction between the nail and wood generates heat. This heat is what makes the nail hot.
  • Friction converts kinetic energy into heat energy.
  • This heat energy raises the temperature of the surfaces involved.
  • In our nail and wood example, the nail becomes hotter because it's in direct contact with the source of friction.
Understanding friction and energy conversion is the key to explaining why a nail gets hot when hammered into the wood.

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