1. The Wedge:	Inclined Plane, Blade, Plow, Zipper.
2. Fulcrum:	Maximizes effort by concentrating and channeling force.
3. Wheel & Axle	Gains force by varying circumfrence.
4. Gears & Belts	Worm, Bevel, Spur, Gears, Sun, Planet, Ring.
5. Cam Shaft & Crank	Trains, Automobile Locomotion.
6. Pulley	Double Block & Tackle.
7. Screw	Vice, Corkscrew.
8. Spring	At rest, squeezed, stretched, store, measure, regain.