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Wedges stop things from moving.

Lots of wedges are triangle shapes.

A door lock is a wedge.

You can put a wedge under a tyre to stop a car or a bike from moving backwards.
A cog on a wheel is a wedge.

There are little wedges on bike wheels.

You can put a wedge under a board to make a seesaw.

A wedge is useful to stop a car on a ramp.

When you use the brake on a car, it is like a wedge.

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