more from Isaac Newton

Single Idea 17017

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

Full Idea

Law 1: Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by forces impressed.

Gist of Idea

1: Bodies rest, or move in straight lines, unless acted on by forces


Isaac Newton (Principia Mathematica [1687], Axioms)

Book Reference

Newton,Isaac: 'Philosophical Writings' [CUP 2004], p.70

A Reaction

This is the new concept of inertia, which revolutionises the picture. Motion itself, which was a profound puzzle for the Greeks, ceases to be a problem by being axiomatised. It is now acceleration which is the the problem.