Gears are toothed wheels and axles. Two or more gears work together in mated pairs. The teeth on each gear mesh in with the teeth on the other gear. The teeth work like levers, transferring motion or power between the gears.
Gears are compound machines that can change the speed, the size, or the direction of a force.
Learn more about gears in the following Whybricks activities:
In this investigation, students explore the fundamentals of how gears work, including mated gears of different sizes. They then work through the engineering design process as they iterate and test a design.