Physics project: Self propelled car.

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Discussion Overview

The discussion centers around designing a self-propelled car for a physics project, exploring various propulsion methods that do not involve combustion or electricity. Participants are seeking alternative ideas to a mouse trap mechanism and are also tasked with creating a braking system to stop the car at a specified distance.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant suggests using a mouse trap tied to the axle but expresses a desire for alternative propulsion methods, such as magnetic systems.
  • Another participant proposes using compressed air from toy planes as a propulsion source.
  • There is a suggestion to use a spray can as a propulsion mechanism, triggered by the axle.
  • Some participants note restrictions on using various energy sources, including springs, compressed air, water, electricity, and combustion, complicating the search for viable propulsion methods.
  • One humorous suggestion is to use nuclear fusion, while others inquire about the possibility of using chemical reactions or sails.
  • A participant proposes using a flywheel as a potential energy storage method, explaining its function and referencing toy cars that utilize this mechanism.
  • There is a discussion about how to build or obtain a flywheel, with suggestions to repurpose components from existing toys.

Areas of Agreement / Disagreement

Participants express a range of ideas and suggestions, but there is no consensus on a single propulsion method. The discussion remains open with multiple competing views on how to approach the project.

Contextual Notes

Participants have noted limitations on the types of propulsion systems that can be used, which may affect the feasibility of some proposed ideas. The discussion includes various assumptions about the definitions of propulsion and energy storage methods.

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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For all the years I've been here, this is a problem that seems to come back once or twice a year. Do some searching with the search tool on this forum...
 
vanesch said:
For all the years I've been here, this is a problem that seems to come back once or twice a year. Do some searching with the search tool on this forum...

i have searched and all of them use mouse/rat traps that pull a chord attached to the axle. I am looking for a different source of thrust/propulsion...
 
Try compressed air. Rip apart one of those air hogs planes and just the power plant to drive your mouse car instead of a propeller.
 
Air hogs planes are pretty expensive if you don't use them for what they are meant for! Instead, I would suggest using a spray can (the ones that clean computers and stuff) and have the axle trigger it somehow, like someone pulling a string.
 
Poincare1 said:
Air hogs planes are pretty expensive if you don't use them for what they are meant for! Instead, I would suggest using a spray can (the ones that clean computers and stuff) and have the axle trigger it somehow, like someone pulling a string.

shoulda said this earlier... no compressed air or water. =(
 
Mmm, no springs (mousetraps), no compressed air, no water, no electricity, no combustion...

It's going to become difficult to find an energy storage. I have a proposal: use nuclear fusion :biggrin:

Can you use chemical reactions other than combustion ?
Or use a sail ? Can you use an animal ?
 
vanesch said:
Mmm, no springs (mousetraps), no compressed air, no water, no electricity, no combustion...

It's going to become difficult to find an energy storage. I have a proposal: use nuclear fusion :biggrin:

Can you use chemical reactions other than combustion ?
Or use a sail ? Can you use an animal ?

i can use a sail! and i can use springs(mousetraps). but i was trying to stay clear of the cliched mousetrap. i can use magnets somehow. no animals though. and i need a braking system :mad:
 
Maybe use a flywheel?
 
  • #10
Teeril said:
Maybe use a flywheel?

explain this flywheel method?
 
  • #11
It's basically just a rotating mass (see http://en.wikipedia.org/wiki/Flywheel), there are also some toy cars that use them (like http://www.madcattoys.com/cu1027kk.html ).

The toy starts driving right away after charging it (by moving the toy) but you could make an alternative way to charge it with a lever or something. And could decouple the flywheel to be able to switch it on later instead of right away.

Not sure how long it'll hold it's energy due to friction though, never tried it myself ;)
 
Last edited by a moderator:
  • #12
Teeril said:
It's basically just a rotating mass (see http://en.wikipedia.org/wiki/Flywheel), there are also some toy cars that use them (like http://www.madcattoys.com/cu1027kk.html ).

The toy starts driving right away after charging it (by moving the toy) but you could make an alternative way to charge it with a lever or something. And could decouple the flywheel to be able to switch it on later instead of right away.

Not sure how long it'll hold it's energy due to friction though, never tried it myself ;)

im totally going to try it
 
Last edited by a moderator:
  • #13
Arix said:
im totally going to try it

wait how can i build/get a flywheel
 
  • #14
You could pull one out of any of these toys http://gyroscope.com/, but I think pretty much any (heavy) disc would do. But I don't know any of the math involved ;)

Upside of those is also they come with starter wires ;)
 

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