Click-clack-click-clack. Get into the swing of things with this awesome fridge magnet. Attach the mini Newton's Cradle to your fridge, filing cabinet, school locker, or anything metallic. The Newton's Cradle magnet will then swing into action every time you open the door.
An entertaining novelty gift that demonstrates Newton's Third Law of Motion - for every action there is an equal and opposite reaction. Science has never been so entertaining!