Newtonian Demonstrator
This familiar apparatus dramatizes Newton's Third Law, which states that for every action, there is an equal and opposite reaction. Use to illustrate that momentum and kinetic energy are conserved. Lift and drop one ball, and one shoots out from the opposite side; start with two balls, and two shoot out, etc. Apply all the logic and laws of physics you want to this little gadget - it's still amazing! Built to last for years with minimal care. Includes an instruction sheet outlining the principles involved plus tips on use and storage.