inertia: (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force
natural phenomenon: all phenomena that are not artificial
teddy boys: a British youth subculture that first appeared in the 1950s; mainly from unskilled backgrounds, they adopted a pseudo-Edwardian dress code and rock'n'roll music; proletarian and xenophobic, they were involved in race riots in the United Kingdom