Assertion: bearing's ball | /r/CapableOf | reduce friction
Facets:
value: by their shape
type: OTHER
value: by finish
type: MANNER
Source sentences:
text: An example of this is where the cage is made of plastic, and it separates the rollers/balls, which reduce friction by their shape and finish.
text: As the pulley wheel turns, the individual balls inside the bearing help evenly spread load weight, reduce friction, and provide a smooth, even rotation with limited vibration or loss of speed.