This presentation details the process of building and testing a CO2 car. I used this as a grade 9 technology project but it can be used in a few other subject areas. You do need access to a few woodworking tools.
This is a set of tasks that are to be done in a 1 hour timed block. This was for a grade 11 class learning Python but it would work for many languages with a little adjustment. I like it because the kids that know what they are doing will enjoy