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rack and pinion
Definition
A rack and pinion is a simple machine that converts rotational motion into linear motion. It is made up of two parts: a rack and a pinion. The rack is a straight bar with teeth on it. The pinion is a gear with teeth that fit into the teeth on the rack.
When the pinion turns, it moves the rack back and forth. The amount of movement of the rack is proportional to the amount of rotation of the pinion.
Rack and pinions are used in a variety of machines, including cars, bicycles, and power steering systems.
How can the word be used?
The car's steering system uses a rack and pinion mechanism.
Different forms of the word
Noun: a system of gears that converts rotational motion into linear motion.
Adjective: of or relating to a rack and pinion system.
Etymology
The word "rack and pinion" comes from the Old English words "raca" and "pinna", which mean "toothed bar" and "pin" respectively.
The first recorded use of the word "rack and pinion" in English was in the 16th century.
Question
Where might you find a rack and pinion in use?