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Transcript of Simple Machine
A screw fastens a material to another material.People invented wheels about 3500 BC, but the earliest possible example of a screw that we know of was from about 700 BC.There was no more evidence of people using screws until about 250 BC, when the Greek inventor Archimedes certainly made a wooden screw press.A screw can be used for many things.Screws hold things together so they won't fall apart.For example, a screw off jar lid.
A Lever with a fulcrum changes direction of the force applied and can magnify or reduce the force based on the position of the fulcrum.By the time people were living in cities, about 3500 BC, they used levers for many more things.One of the most important uses of levers was for a shaduf to lift water into irrigation channels.By about 200 BC, scientists like Archimedes were beginning to figure out why levers worked.Levers have been used to lift heavy objects.For example, a hammer prying a nail out of wood.
The purpose of a pulley system is to be able to move a heavy object with less effort.Because there are no wheels in nature, there are also no pulleys.Pulleys may have been invented by Archimedes in ancient Sicily, about 250 BC.Pulleys have been used to transport things up and down.For example, a pulley on a clothesline.
Wheel and Axles
A simple machine consisting of a wheel that turns an axle around which a cord is wound; its mechanical advantage is the ratio of the diameters of the wheel and axle.People didn't use wheels until the early Bronze Age, around 3500 BC.The earliest evidence for people using wheels comes from Sumeria, about 4000 BC.The wheel and axle has been used to make moving things from place to place easiest.For example, when you turn a door knob your using a wheel and axle.
A wedge is a inclined plane that splits things apart.People have been using wedges in Africa since the earliest Stone Age, about 2.6 million years ago.These early wedges were used as stone hand axes.
A wedge is a inclined plane that splits things apart.People have been using wedges in Africa since the earliest Stone Age, about 2.6 million years ago.One of the early wedges were stone hand axes.Wedges have been used to separate things.For example, when you cut wood your using a wedge because a ax is a wedge.
Inclined planes make it easier to lift something heavy.All kinds of animals used inclined planes when they choose their path up a steep hill, and people have used them since there first were people, about 200,000 years ago.By the time of Old Kingdom Egypt, about 2500 BC, people were building there own earth ramps to move many stones for the Pyramids.Inclined planes help to move heavy objects.For example, wheel chair ramps are Inclined planes.
-Levers are used to move or lift an object.A lever can be a board or a stiff bar.
-A Pulley is a wheel with two raised edges so that a rope or string will run along the wheel without coming off.
-A wheel and axle turns around as a machine that works like a lever
-A simple screw that holds pieces of wood together is also a type of machine.
-A wedge is really an inclined plane turned on its side.
-Another name for an inclined plane is a ramp.
-A example of a lever is a stapler.
-A example of a pulley is a flag pole.
-A example of a wheel and axle is roller blades.
-A example of a screw a light bulb.
-A example of a wedge is scissors.
-A example of a inclined plane is a ladder.