6 Simple Machines

Pulley.   A pulley is a simple machine that uses grooved wheels and a rope to raise, lower or move a load.
Wheel and Axle. A wheel with a rod, called an axle, through its center lifts or moves loads.
Screw. A screw is an inclined plane wrapped around a pole which holds things together or lifts materials.
Inclined Plane. An inclined plane is a slanting surface connecting a lower level to a higher level.
Wedge. A wedge is an object with at least one  slanting side ending in a sharp edge, which cuts material apart.
Lever. A lever is a stiff bar that rests on a support called a fulcrum which lifts or moves loads.
                                                                             From http://www.mikids.com/Smachines.htm

Basics of Simple Machines