Bearings
Since Murphy or whoever it was, took credit for the round wheel,
rolling technology has changed somewhat.
Today, friction whether static or dynamic, is reliant on
bearings to reduce motor or engine load. What is sometimes
overlooked is the inherent features and design of a bearings to
reduce temperature where it is not necessary. The basic
requirement is to reduce contacting surface areas. More extreme
requirements are to reduce vibration, reduce allotted space
required to house such a bearing, and extend their life.
Needle roller bearings are used where the load is spread length
ways, and a typical or common application would be the