Think of a long, strong stick (a lever). The stick is propped up on a small object (the fulcrum). Now imagine that you are holding one end of the stick and a heavy rock (the load) is on the other end. By pulling down (effort) on the stick, you will be able to lift the rock. In levers, the effort is applied at a different point from the load. And, the position of the fulcrum makes all the difference in the amount of effort (push or pull) that is needed to move a load. Ancient Greek scientist and engineer Archimedes once said “Give me a place to stand on, and with a lever I can move the whole world.” For more information on levers, see the Simple Machines
issue of Kids Discover, now available on the iPad.