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the locking of the wheels of a vehicle—for example, a motor vehicle, a streetcar, or railroad rolling stock—while the vehicle is in motion. As a result of such locking, the wheels slide over the bearing surface rather than turn.
A skid occurs when the braking force exceeds the force of adhesion between the wheels and the surface of a road or track, for example, in the presence of glaze ice or after rain. Skidding increases the braking distance and may cause traffic accidents. As a rule, the skidding of the rear wheels of a motor vehicle results in sideslip of the rear axle.
To avoid skids, modern motor vehicles may be equipped with automatic devices that prevent the wheels from locking.
ii. In helicopters, a fixed tubular landing gear, often provided with small auxiliary wheels to provide ground mobility.
iii. A rigid ski-shaped member projecting ahead of the landing gear to prevent them from nosing over.
iv. A support for the tail-wheel on the ground in airplanes of early years.
v. A member mounted at the bottom of the aft end of the fuselage of an aircraft with a tricycle undercarriage. The skid absorbs the shock and prevents damage to the aircraft structure if the skid touches the ground either on the takeoff or the landing.