Identify the two major functions of a bearing.

Identify the two major functions of a bearing.

• A. Support loads and reduce friction
• B. Store energy and transmit power
• C. Resist corrosion and insulate
• D. Seal and dampen

Answer: (A)

Bearings have two main roles: supporting loads and reducing friction. The support part means a bearing must carry the forces acting on a rotating shaft—radial loads perpendicular to the shaft and, in many designs, axial loads along the axis as well. The friction-reduction part comes from providing smooth motion with minimal resistance. Rolling-element bearings use balls or rollers to turn sliding contact into rolling contact, which dramatically lowers friction and wear; plain bearings rely on a lubricating film to minimize direct surface contact and friction. Together, these functions keep shafts properly aligned, allow smooth rotation, and improve efficiency by minimizing energy losses and heat. Other features like sealing or damping can be present, but they’re not the fundamental purpose of a bearing.

Bearings have two main roles: supporting loads and reducing friction. The support part means a bearing must carry the forces acting on a rotating shaft—radial loads perpendicular to the shaft and, in many designs, axial loads along the axis as well. The friction-reduction part comes from providing smooth motion with minimal resistance. Rolling-element bearings use balls or rollers to turn sliding contact into rolling contact, which dramatically lowers friction and wear; plain bearings rely on a lubricating film to minimize direct surface contact and friction. Together, these functions keep shafts properly aligned, allow smooth rotation, and improve efficiency by minimizing energy losses and heat. Other features like sealing or damping can be present, but they’re not the fundamental purpose of a bearing.