CO₂ rocket car
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This is a work in progress - a CO2 car that I used to demonstrate Newton's 3rd law of motion. The car works well, although I'd change a few things in future: Smaller hole for cartridge to make a snugger fit (cartridge is 18mm in diameter, hole is 20mm so I use blu-tack to secure it). Eye screw at the rear of the car had to be slightly cut so that it didn't protrude into the cartridge hole. Remember to secure the car to a guide line (fishing line) so that there is no risk of it veering off course. Apart from that, it's all good!
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