Friction

Friction was a physical process whereby energy could be transferred via the rubbing together of two objects. Friction could be used to ignite the white phosphorus on 19th century matches. (PROSE: The Death of Art)
The War Doctor and Eleventh Doctor's TARDISes both had friction contrafibulator buttons on their consoles. (TV: The Day of the Doctor, Vincent and the Doctor) 
Category:Science from the real world
Category:Physics from the real world