Best physics projects? One student, one tag-a-long, one handy dh, and a bit of $$

[katilac]

What are some great hands-on physics projects for high school? I'd like a mix of shorter/simpler ones, but at least one or two more elaborate ones, maybe building something? 

 

I wouldn't mind spending $100 or even more on a more complex project, if it had a good mix of being interesting and educational. 

 

dh can guide her through building most anything, and he has a pretty good knowledge of electricity (and we have a go-to electrician for any questions or safety issues that are beyond us). A kit would work also. 

 

Any great ideas? 

 

Edited to add that I meant to post this on the high school board! Oh, well, I will cross-post.