Friction
Friction resists relative motion or the tendency toward motion between contacting surfaces.
In context
Friction can hinder movement and generate heat, but it is also needed to prevent slipping or transmit driving force. Surfaces, loads, and lubrication conditions affect the result.
Example
A conveyor needs friction to move products with its belt. Unconditionally reducing friction everywhere is not a sound improvement.
Key distinction
Distinguish functions that need friction from losses that should be reduced.
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