I'm doing a physics project where I have to find plans for a device and then build it and type a report demonstrating the physics behind it. However, the materials can't cost more than $75 total. I'm having trouble finding any plans, especially ones that are interesting, inexpensive, and easy to build. I would appreciate any links to websites that show step-by-step instructions on how to build a device that's feasible for the project. Thank you.

1 answer

What about a model plane?

http://www.svensons.com/airplanes/

Or a toy?(Broken Link Removed)

or a neat thing here
http://teachingphysics.wordpress.com/2008/06/02/building-an-electric-motor/