My class’s physics project is working to build a Rube Goldberg style machine, with many different steps and conversions of energy to ultimately crack an egg into a bowl. Long story short, I need some kind of conductive liquid (relatively cheap and accessible) to complete electrical circuit on. * For any geeks who love this kind of stuff as much as I do, the idea is to shoot marbles off a ramp into a beaker / bowl / container of some kind of conductive liquid, Thus raising the level of the liquid and completing a circuit Which power forward wants a small motorized car to continue the machine!
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