Note 24 — Chapter XI · The Laws of Motion.
Reading edition
If the Laws of Motion are stated as three, which we conceive to be the true view of the subject, the other two, as applied in mechanical reasonings, are the following:
Second Law. When a force acts on a body in motion, it produces the same effect as if the same force acted on a body at rest.
Third Law. When a force of the nature of pressure produces motion, the velocity produced is proportional to the force, other things beings equal.