more from Rom Harr

Single Idea 15865

[catalogued under 26. Natural Theory / D. Laws of Nature / 1. Laws of Nature]

Full Idea

We can never devise an experimental situation in which there are no external forces to act on a body. It follows that Newton's First Law could never be demonstrated by means of experiment or observation.


The First Law says things continue in their state unless acted on by a force

Gist of Idea

Newton's First Law cannot be demonstrated experimentally, as that needs absence of external forces


Rom Harr (Laws of Nature [1993], 1)

Book Reference

Harr,Rom: 'Laws of Nature' [Duckworth 1993], p.22

A Reaction

It can't be wholly demonstrated, but certain observations conform to it, such as the movement of low friction bodies, or the movements of planetary bodies.