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plain MachinesA windmill is a implement that uses the wind to turn a wheel of adjustable vanes, slats or sails. As the wheel turns, it turns a shaft, wheels, and gears that personnel machinery. It is more properly called a wind pump, but most community call it a windmill. Windmills have been used for hundred of years to indicant machinery used to grind grain such as wheat and corn. at once we also have windmills, called wind turbines, that generate electricity.All machines are a combination of several bare(a) machines or modifications of one. A simple machine is one that is moved by just one force. The six types of simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the w parade, and the screw. A lever is a abundant plank, beam or bar that is used to move heavy loads. Examples of a lever are seesaws, scissors, broom, tweezers, and ice-tongs. A wheel is a cylindrical objective lens that rotates about axis of the cylinder. Wheels are on cars and trains. Some wheels turn other(a) wheels, like geared wheels on a bicycle or a clock. Some wheels turn together like the doorknobs, or the knobs on a televisions. A pulley is a grooved wheel. A rope is fitted into the grove and turns the wheel when pulled. An inclined plane is a very simple machine. It has a sloping surface that makes it easier to pull, push, or roll heavy objects. Examples are wheelchair ramps or a stairway. The screw is an inclined plane wound at its edge on a cylinder or cone. Examples of a screw includes faucets, Saizan 2screw-in bulbs, and screw-on bottle tops. The wedge is essentially an inclined plane such as knives, blades, nails, needles, pins, wood and axes.