What description explains how bearings reduce friction by using smooth balls or rollers that bear the load to allow rotation?

What description explains how bearings reduce friction by using smooth balls or rollers that bear the load to allow rotation?

• A. Bearing Friction
• B. Maintenance of bearings
• C. Bearings loads
• D. Rolling bearings

Answer: (B)

The key idea is how moving with rolling contact lowers friction. Bearings that use smooth balls or rollers between inner and outer races carry the load while allowing rotation. Because the load is carried by rolling elements, the contact between surfaces involves rolling rather than sliding, which greatly reduces friction and lets parts rotate more freely. That’s exactly what rolling bearings describe. The phrase about maintenance focuses on servicing, not the mechanism of friction reduction, and the other options don’t capture the way rolling elements enable rotation.