Assertion: friction | /r/HasProperty | useful
Facets:
value: sometimes
type: DEGREE
value: in most of the cases
type: TEMPORAL
value: very
type: DEGREE
Source sentences:
text: Friction is useful in most of the cases.
text: Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road.
text: Friction is useful when:
text: Friction is very useful but it has its own disadvantages.
text: Friction is sometimes useful, at other times it's a problem.