E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Motion.
The laws of motion, according to Galileo and Newton.
1
(1) If no force acts on a body in motion, it will continue to move uniformly in a straight line.
2
(2) If force acts on a body, it will produce a change of motion proportionate to the force, and in the same direction (as that in which the force acts).
3
(3) When one body exerts force on another, that other body reacts on it with equal force.
