Which is not a function of a bearing?

A bearing primarily serves to reduce friction between moving parts rather than to increase it. The main functions of a bearing include providing support for rotating elements, ensuring smooth motion, and enabling parts to move in a precise manner. When bearings are functioning properly, they help minimize friction, which in turn reduces wear and heat generation in machinery.

By providing a low-friction interface, bearings allow for increased efficiency in the operation of machinery, which is critical for optimal functioning. This is why they are designed to facilitate movement in specific directions or planes and to effectively transfer loads between the bearing and adjacent structures.

In this context, the roles of restricting motion to a single plane, enhancing efficiency by reducing heat, and transferring forces are all correct functions of bearings, emphasizing that their design aims to promote smooth operation and reliability in machinery.