Amusement Park Physics
This is a great interactive site that allows you to build various
amusement park rides. Everything is based on the physics on
how well the rides will work. Start off by creating a roller coaster
ride and then see if it will work. If it does not work, it will give you
the explanation of the problem and you can then go and fix it.
Walk around the park and see other places where you can go and
explore. Have a look at the a bumper car ride. You need to look at the
bumper cars and decide what will happen in different scenarios.