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Press Drop the ball! to start the chain reaction.

What's in this machine?

🧠 The science of chain reactions

Rube Goldberg (1883 to 1970) was an engineer and cartoonist who drew silly, complicated machines that did simple jobs, like a machine that wipes your mouth with a napkin using a parrot, a rocket, and a swinging bucket! Today, engineers and students build real ones for fun and to practice problem solving.

⚑ Energy transferEach part passes energy to the next part, like a relay race.
⬇️ GravityPulls the ball down every ramp. It's the "engine" for most of the machine.
🎒 Potential β†’ kineticA ball high up has stored (potential) energy. As it falls, it turns into motion (kinetic) energy.
πŸ”— Chain reactionOne event causes the next, which causes the next. Watch the dominoes!
βš–οΈ LeversThe seesaw is a lever. Push one end down and the other end goes up.
πŸŒ€ FrictionRubbing slows things down. That's why the ball eventually stops rolling.