Teacher: Today, we're going to be talking about the law of conservation of energy.
Student: What's that?
Teacher: It's a law of physics that states that the total amount of energy in an isolated system remains constant.
Student: So, energy can't be created or destroyed?
Teacher: That's right. It can only be changed from one form to another.
Student: Like when you burn a piece of wood?
Teacher: Yes. The chemical energy in the wood is converted to heat and light energy.
Student: So the total amount of energy in the universe is always the same?
Teacher: It appears so from the evidence we have.
Student: That's amazing!
Teacher: It is pretty amazing. And it has a lot of implications for our lives.
Student: Like what?
Teacher: Well, for one thing, it means that we can't create energy out of nothing. We can only harness it and use it.
Student: So that's why we have to conserve energy?
Teacher: Exactly. We need to use energy wisely so that we don't run out of it.
Student: I never thought about it like that before.
Teacher: Well, now you know.
