Some terms ago I had a group project with *real* students at school. Our group built a Squeak eToys project.

This project is about free-falling objects and their behavior on planes.

You can try it for yourself. Be sure that you have installed the Squeak Plugin. It is available for all common platforms. If you have installed Squeak, your browser should be able to run the project. You also can change the project and save it on your local drive!

Have fun!