My kids assembled various hydraulic and pneumatic powered vehicles and ran tests to determine how they performed.
build your own remote control vehicle kit so we decided to purchase the Thames & Kosmos Air + Water Power.
The kit comes with about six different project ideas as well as detailed scientific explanations for how hydraulics and pneumatics work. In the future, I will be encouraging the kids to keep a notebook, use a stop watch, and measure distance traveled of their various configurations and experiments. They really enjoyed and learned a lot already.
Check out these great blogs full of educational activity ideas.