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a wheel with a groove in which a cord (or rope) runs.

how does it work?
it changes the direction of a force applied to the cord

what is it used for?
typically to raise heavy weights

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Simple machines have few moving parts. They make our work easier and help us move things.

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A wedge is a triangular shaped tool, and is a portable inclined plane.  It can be used to separate two objects or portions of an object, lift up an object, or hold an object in place.

examples: axe, knife

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An inclined plane is a simple machine with no moving parts. It is simply an even sloping surface. It makes it easier for us to move objects to higher or lower surfaces, than if we lifted the objects directly upwards.

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maybe the most common simple machine

It has two circular objects which includes a larger disc and a small cylinder both joined at the center.

how does it work?
force is applied either to the wheel (think screwdriver or doorknob) or force is applied to the axle (like a ferris wheel)

other examples: bicycle, fan, windmill

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A lever is the simplest machine of all: it's just a long bar that helps you exert a bigger force when you turn it.

how does it work?
The distance between the handle and the load affects the effort needed to lift or move something heavy.
Think about a seesaw...

examples: hammer claw, wheelbarrow, bottle opener