158 ;;Quote: dead force is an urge to motion; e.g., centrifugal force, gravity, centripetal force, a stretched elastic; potential energy

158+;;Quote: potential energy (dead force) is elementary to kinetic energy (living force)

158+;;Quote: living force is accompanied by motion; kinetic energy

165 ;;Quote: a body's force is proportional to the product of its size and the square of its speed; the law of gravity

168 ;;Quote: force is real; space, time, and motion are relative, a relationship

168+;;Quote: the laws of motion must preserve the relative nature of motion

169 ;;Quote: in substances, change happens spontaneously and in an orderly way

169+;;Quote: rule of continuity -- no change takes place by leaps and bounds

169+;;Quote: no atoms of maximal hardness; otherwise collisions would cause an instantaneous leap

171 ;;Quote: no special laws for equal bodies or bodies at rest; since rest is vanishingly small motion, and equality is vanishingly small inequality

171+;;Quote: when instances approach each other continually and eventually merge, the consequences or outcomes must do so also; e.g., parabola is an ellipse