Friction is very important when it comes to energy. It changes useful mechanical energy into heat energy.

Here are some key points:

• Energy Loss: About 20-30% of energy in machines can be wasted because of friction.

• Heat Generation: The force of friction ($F_f$) can be figured out using the formula $F_f = \mu N$. Here, $\mu$ is a number that tells us how much friction there is, and $N$ is the force pushing objects together.

• Efficiency Impact: When there is a lot of friction, a machine can work up to 50% less efficiently.

To keep energy from being wasted, it’s important to have good insulation and find ways to reduce friction.