gear

A gear is a wheel with teeth around the edge. Gears are used to transmit motion and power from one place to another.

When two gears are connected, the teeth on one gear mesh with the teeth on the other gear. This causes the gears to rotate at the same speed but in opposite directions.

Gears can be used to change the speed or direction of rotation. For example, if you want to make a machine go faster, you can use a gear with more teeth. If you want to make a machine go in the opposite direction, you can use a gear with fewer teeth.

Gears are used in many different machines, such as bicycles, cars, and clocks. They are also used in many industrial machines, such as power plants and factories.

A set of interlocking wheels or cogs that transmit power.