electricity vs friction

electricity

noun
  • Originally, a property of amber and certain other nonconducting substances to attract lightweight material when rubbed, or the cause of this property; now understood to be a phenomenon caused by the distribution and movement of charged subatomic particles and their interaction with the electromagnetic field. 

  • Electric power/energy as used in homes etc., supplied by power stations or generators. 

  • The study of electrical phenomena; the branch of science dealing with such phenomena. 

  • A feeling of excitement; a thrill. 

friction

noun
  • The rubbing of one object or surface against another. 

  • A force that resists the relative motion or tendency to such motion of two bodies in contact. 

  • (Second Sino-Japanese War) Conflict, as between the Communists and non-Hanjian Kuomintang forces. 

  • Conflict, as between persons having dissimilar ideas or interests; clash. 

How often have the words electricity and friction occurred in a corpus of books? (source: Google Ngram Viewer )