Tribophysics

Tribophysics was the science of interacting surfaces in relative motion. This science was dated back to the Time of Legend on Gallifrey. (PROSE: Damaged Goods)

When Sarah Jane Smith and the Fourth Doctor were in a pyramid on Mars, the Doctor revealed and opened a door using a hand gesture. Sarah said, "Tribophysics!" The Doctor replied, "Yes." (TV: Pyramids of Mars)

Blon Fel-Fotch Passameer-Day Slitheen planned to use a tribophysical waveform macro-kinetic extrapolator as a pan-dimensional surfboard to escape her planned destruction of the Earth. The Ninth Doctor and Jack Harkness added this device to the Doctor's TARDIS. (TV: Boom Town)