Gear up

A gear is a simple machine, where two or more wheels have teeth, or cogs, that fit together so that when one turns, the teeth fit together so that the other turns as well. In this way, rotational torque is transferred from one axle to another. These axles can be parallel to each other, or, as in this case by Legohaulic, at an angle. If the gears have different diameters, they will rotate at different speeds.