Physics project: Self propelled car

AI Thread Summary
The discussion revolves around a physics project requiring the design of a self-propelled car using non-combustion and non-electric propulsion systems. The original idea of using a mouse trap is being reconsidered, prompting a search for alternative propulsion methods, with magnetic propulsion suggested. Additionally, the project includes the challenge of designing a braking system to stop the car at a predetermined distance, such as 40 meters. Participants are encouraged to brainstorm creative solutions while adhering to the project's restrictions. The focus remains on innovative, non-animal powered propulsion ideas.
Arix
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ok, so i have a physics project. we were assigned to use a mouse trap tied to the axle by a string to propel a homemade car of sorts. but he says we can use and propulsion system as long as it doesn't use combustion or electricity. i don't want to use a mouse trap and I'm looking for other ideas. maybe magnetic? any ideas? we also are to design a braking system so that the car will stop at a self-set distance such as 40m. any ideas?
 
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What about a mouse?
 
cant be animal powered either
 
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