. "http://en.wikipedia.org/wiki/Friction"^^ . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31889"^^ . . . . . . . . . . . "Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from sliding down a sloped surface. " . . . "Static Friction"@en . . . . . . "http://dbpedia.org/resource/Friction"^^ . . . .