thumb|upright=1.5|right|Two intermeshing spur gears rotating at different velocity due to differing gear ratio
A cogwheel is a toothed wheel that meshes with other toothed wheels to transfer and control rotational motion and power in machines. By using cogwheels of different sizes, machines can change the speed and force of rotation to accomplish tasks ranging from simple tools to complex mechanical systems.
AI-generated from the Wikipedia summary — may contain errors.
thumb|upright=1.5|right|Two intermeshing spur gears rotating at different velocity due to differing gear ratio
A gear or gearwheel, also called a toothed wheel, is a rotating machine part typically used to transmit rotational motion or torque by means of a series of "teeth" that engage with compatible teeth of another gear or other part. The teeth can be integral saliences or cavities machined on the part, or separate pegs inserted into it. In the latter case, the gear is usually called a cogwheel. A cog may be one of those pegs or the whole gear. Two or more meshing gears are called a gear train.
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