Rolling Element Bearing

Rolling bearing is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two bearing rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with litte sliding. One of the earliest and best-known rolling-element bearings are sets of logs laid on the ground with a large stone black on top. As the stone is pulled, the logs roll along the ground with little sliding friction. As each log comes out the back, it is
moved to the front where the block then rolls on to it It is possible to imitate such a bearing by placing several pens or pencils on atable and placing an item on top of them.