What to build for physics experiment?

[qwerty]

I have to build a project for my physics experiemtn, it will take place over hmm about 2 months or so.

 

One person is building a telescope (trying to)

 

I wanted to build a rocket, but since i've never built one and they are dangerous and this is high school I will probably definately not be allowed.

 

Another thing i thought of is a rocket car or something similar, dunno exactly how to build it, but it would be easy to do research on and easy to talk about the results (time of movement, how far it went, top speed)

 

Any ideas people? Thanks..

[-Demosthenes-]

If they won't let you make a rocket that goes harmlessly in the air, why would they let you make a rocket car that rockets accross the room??

[calbiterol]

A hovercraft might be cool. Or a plane, but that's a little (lot) more complicated. A gauss rifle, a coil gun, or a railgun might also be fun, but they all require some serious work (and caution).

[RedAlert]

http://www.scitoys.com/

 

Check this site out. You are bound to find ideas here.