| Description: | Rotating Redwheel 1920X1200 Wallpaper |
| Category | GREAT DETAILS WALLPAPERS |
| Image Filesize | 504.6 KB |
| Date: | 19.01.2012 00:13 |
| Last view date | 21.05.2012 23:13 |
| Last view user | Guest |
| Hits: | 652 |
| Downloads: | 27 |
| Rating: | 0.00 (0Vote(s)) |
| File size: | 504.6 KB |
| Added by: | admin |
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A wheel is a circular component that is intended to rotate on an axle. The wheel is one of the main components of the wheel and axle which is one of the six simple machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel and flywheel.
Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or performing labor in machines. Common examples are found in transport applications. A wheel greatly reduces friction by facilitating motion by rolling together with the use of axles. In order for wheels to rotate, a moment needs to be applied to the wheel about its axis, either by way of gravity, or by application of another external force.
The English word wheel comes from the Old English word hweol, hweogol, from Proto-Germanic *hwehwlan, *hwegwlan, from Proto-Indo-European *kwekwlo-,[1] an extended form of the root *kwel- "to revolve, move around". Cognates within Indo-European include Greek """""" kýklos, "wheel", Sanskrit chakra, Old Church Slavonic kolo, all meaning "circle" or "wheel",[2]
The Latin word rota is from the Proto-Indo-European *rot"-, the extended o-grade form of the root *ret- meaning "to roll, revolve".[3]
Evidence of wheeled vehicles appears from the mid-4th millennium BC, near-simultaneously in Mesopotamia, the Northern Caucasus (Maykop culture) and Central Europe, so that the question of which culture originally invented the wheeled vehicle remains unresolved and under debate.
The earliest well-dated depiction of a wheeled vehicle (here a wagon"four wheels, two axles), is on the Bronocice pot, a ca. 3500"3350 BC clay pot excavated in a Funnelbeaker culture settlement in southern Poland.[4]
The wheeled vehicle spread from the area of its first occurrence (Mesopotamia, Caucasus, Balkans, Central Europe) across Eurasia, reaching the Indus Valley by the 3rd millennium BC. During the 2nd millennium BC, the spoke-wheeled chariot spread at an increased pace, reaching both China and Scandinavia by 1200 BC. In China, the wheel was certainly present with the adoption of the chariot in ca. 1200 BC,[5] although Barbieri-Low[6] argues for earlier Chinese wheeled vehicles, circa 2000 BC.
Source: Wikipedia
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