Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Friction-en#Sense
Gnidning-da#Sense
Atrito-pt#Sense
Fricção-pt#Sense
Friktion-sv#Sense
Kitka-fi#Sense
Τριβή-el#Sense
Friktion-da#Sense
Wrijving-nl#Sense
Reibung-de#Sense
Fricción-es#Sense