Thermodynamics

Consider a lead block. Inside the lead block the particles have energy.

The particles in the block **vibrate** in other words the particles have some **kinetic energy**.

The **stretching** and **squashing** of the **bonds** between the particles is a form of **potential energy**.

//In other words internal energy is the **total energy** of the particles.//
 * kinetic energy + potential energy = internal energy or U**

Imagine hitting a lead block with a hammer. How would this affect the internal energy (and also the temperature) of the molecules?
 * //__Question__//**


 * A**. No change
 * B**. Decrease
 * C**. Increase

Try to explain the answer, click below to find out the correct answer and explanation. [|Answer]

The answer is **C**. When the lead block is hit with a hammer the block is squashed, the energy from the strike is inside the block. After the hit the molecules inside the lead block are vibrating more vigorously. They have more energy. Since temperature is the average kinetic energy of the molecules the temperature would have increased also. -->Increasing internal energy by Heating