Select the most appropriate classification for rolling contact bearings.

Explanation:

Bearing:

• A bearing is a mechanical component that decreases friction between moving parts by restricting relative motion to only the desired motion.
• The bearing's design may allow for free linear movement of the moving part or free rotation around a fixed axis.

Rolling Contact Bearing:

• Rolling contact bearings are also known as antifriction bearings because of their reduced friction.
• A rolling contact bearing carries a load by sandwiching rolling elements (such as balls or rollers) between two concentric, grooved rings known as races.
• The rolling elements roll with extremely little rolling resistance and minimal sliding due to the relative motion of the races.
• Sets of logs arranged on the ground with a large stone block on top are one of the earliest and best-known rolling-element bearings.
• The contact between the bearing surfaces in rolling contact bearing is rolling rather than sliding, as in sliding contact bearings.
• Standard sliding bearings have a high coefficient of friction and start at rest with almost metal-to-metal contact.
• The decreased starting friction of a rolling contact bearing over a sliding bearing is a significant advantage.

Types of Rolling Contact Bearing:
Following are the five different types of rolling bearing elements:

• Balls
• Cylindrical rollers
• Spherical rollers
• Tapered rollers
• Needle rollers