Science Buddies: "Ask an Expert"

I have to do a physical science experimental project, and my teacher doen't want anything simple. I only have 4 days to do it in... but I need something good.

A past student did quite well investigating the effect of salt content in water on the refraction of light, and then comparing tis to the salt content of sea water etc.

what type of project ideas are 'complex' enough? Please help me as soon as possible!

Thank you

This may be a duplicate...

Rollercoasters are good to investigate with pipe insulation foam (available at hardware store); can calculate kinetic & potential energy.

Cardboard boats have potential; can try different shapes, sizes, duct tape or glue, etc. Explore buoyancy and Archimedes PRinciple.

What type of class are you in? what are you studying? need some more hints!

I gather this is an experiment only, not a research project?

Ceal Craig