Newtonian Demonstrator - Newton's Cradle

This familiar apparatus dramatizes Newton's Third Law!

For every force, there is an equal and opposite force. 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! Includes an instruction sheet outlining the principles involved plus tips on use and storage. Size is 9"H x 7"W x 9"L.