A bearing is a mechanical component that limits relative motion within the desired range of motion and reduces friction between moving parts. The design of bearings can provide free linear motion of moving parts or free rotation around a fixed axis, and can also prevent motion by controlling the vector of normal force acting on the moving parts. Most bearings promote the required motion by minimizing friction. Bearings can be widely classified according to different methods such as operation type, allowed movement, or direction of load (force) applied to the part.
