Assertion: wheel's surface | /r/CapableOf | slide over each other
Facets:
Source sentences:
text: So while the object still moves 10 m the sliding frictional surfaces only slide over each other a distance of 0.5 m. The work done is 981 × 0.25 × 0.5 = 123 joules; the work done has reduced to 1/40 of that of dragging.
text: In either case, the key to making the wheel work efficiently is reducing the friction wherever two surfaces slide against each other.