Setting: Cooper, Olivia, and Hamza had a hard time with their science homework last night. They’re talking in the hallway before class.
Cooper: You look half dead, Hamza. Here, take my energy bar.
Hamza: Thanks. I get that the bar will give me some energy, but I did not get last night’s homework about energy. Did you?
Olivia: Hi guys! I thought the homework was confusing, too. It said something about energy having to do with things moving, but energy bars don’t move. At least not like a ball or a wave does.
Cooper: Maybe they’re called energy bars because they can make people move more when they eat them? I don’t know, though.
Hamza: I thought energy was electricity that makes stuff work, like lights.
Olivia: Maybe energy can do a lot of different things. But then why bother with the word “energy”? Why don’t we just say “food” when we mean food and “electricity” when we mean electricity?
Hamza: I think that this energy bar is working. I feel better. My energy had gone on vacation, and now it’s...coming home.
Cooper: You know, your energy might have come back, but the energy we are studying never goes away, it just changes. Look...
He pulls out his homework and points to this graphic: