Assertion: ball bearing | /r/CapableOf | use ball
Facets:
value: to reduce friction
type: PURPOSE
value: to maintain the separation
type: PURPOSE
Source sentences:
text: A ball bearing is a rolling element bearing that used ball to maintain the separation between the bearing races.
text: Ball bearings use balls to separate two “races,” or bearing rings, to reduce surface contact and friction across moving planes.
text: A ball bearing is a piece of equipment that uses balls to reduce friction in a spinning system.