Shock absorber is a device that reduces shock or concussion. It is used on automobiles, airplane landing gears, and doors. Automobile shock absorbers also reduce unwanted vehicle motion caused by uneven road surfaces or by turning and braking maneuvers.
Most shock absorbers consist of a piston inside a cylinder containing air or oil. In a car, the force of a bump is transmitted to the shock absorber, pushing the piston upward. But oil in the cylinder resists the piston. This resistance absorbs the shock and offsets the force of the bump. See also Automobile (Supporting the car) ; Spring [metal] ; Torsion bar suspension .
