Information AboutRolling |
| CATEGORIES ABOUT ROLLING | |
| metal forming | |
| materials science | |
| metallurgy | |
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Rolling is a combination of Rotation (of a more or less cylindrically or spherically symmetric object) and translation of that object with respect to a surface (either one or the other moves), such that the two are in contact with each other without sliding. This is achieved by a rotational speed at the cylinder or circle of contact which is equal to the translational speed. Rolling of a round object typically requires less energy than sliding, therefore such an object will more easily move, if it experiences a force with a component along the surface, for instance gravity on a tilted surface; wind; pushing; pulling; an engine. Objects with corners, such as Dice , roll by successive rotations about the edge or corner which is in contact with the surface. Two surfaces can ' Slide ' more easily using rolling objects in between, see Rolling-element Bearing . Apart from being easily transported itself (and if it is hollow, transporting things inside), a rolling object can be used as a Tool for Transportation . One of the most basic ways is placing an object on rolling objects. These can be taken from the backside and put at the front side repeatedly (see rolling-element bearing and History Of Bearings ). More advanced is the Wheel . These rolling techniques require a smoother surface/ Road than when people and animals Walk and carry things. rolling- a slang term for the use of the drug, MDMA. SEE ALSO |
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