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Inclines Planes, Wedges, and Screws
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Vocabulary
 challenging words: theory, based, simple, sketch, planes, power, lowers, spiral, instance, scientific, such, pyramid, connect, between, force, flow content words: Ancient Egyptians

Other Languages
French: Les plans inclinés, les coins et les vis
Spanish: Planos, cuñas, y tornillos
Italian: Piani inclinati, cunei e viti
German: Schiefe Ebenen, Keile und Schrauben

 Inclines Planes, Wedges, and Screws By Sharon Fabian

1     Simple machines are even simpler to remember if you group the ones that go together. For instance, the inclined plane, wedge, and screw all have something in common. Let me explain.

2     An inclined plane is just a sloping surface, such as a sliding board. Usually the inclined plane stays in one place and something moves up or down the slope. You slide down the sliding board. Just like all simple machines, an inclined plane makes work easier. A wheelchair ramp is another example. Some people find it easier to travel up the ramp than to take the stairs. Ramps also make it easier to load and unload a truck. Ancient Egyptians may have used ramps to build the giant pyramids. One theory is that they gradually built up a ramp in the sand, which spiraled around the outside of the pyramid as it grew taller. The huge building blocks were then pushed up the ramp.

3     A wedge looks like two inclined planes stuck together. The edge of a wedge is often called the blade. The big difference between a wedge and an inclined plane is that, while the inclined plane stays still, a wedge moves to do its work. To chop down a tree, someone has to swing the axe. To cut out a paper heart, you need to move the scissor blades up and down.

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