Demonstrate inertia with a Card Shot trick. Use a cardboard rocket ship to find the center of gravity, and your own “great salt lake” to display buoyancy. Crush an empty can with the power of air pressure. Other experiments include a water tower that shows the push and pull of air currents, and balloon cars that create motion madness. Ordinary, easy-to-find materials are all you need to get moving on these fun-filled investigations.