Friction of bodies, friction of minds

Agnes Heller

pp. 77-84

in: Nordal Åkerman (ed), The necessity of friction, Heidelberg, Physica, 1993

Abstract

“Notice that the movement of the ball declines and ceases, leaving the ball sound and whole, because the motion that is within the ball is not natural, but accidental and violent. Therefore when the impetus that is impressed upon it dies out, it stops. But if that ball were perfectly round ... its motion would be round. That motion would be natural and in no way violent, and would never cease.”