more from Isaac Newton

Single Idea 17019

[catalogued under 27. Natural Reality / A. Classical Physics / 1. Mechanics / b. Laws of motion]

Full Idea

Law 3: To any action there is always an opposite and equal reaction; in other words, the action of two bodies upon each other are always equal and always opposite in direction.

Gist of Idea

3: All actions of bodies have an equal and opposite reaction


Isaac Newton (Principia Mathematica [1687], Axioms)

Book Reference

Newton,Isaac: 'Philosophical Writings' [CUP 2004], p.71

A Reaction

Is this still true if one body is dented by the impact and the other one isn't? What counts as a 'body'?