more from this thinker | more from this text
Full Idea
Law 2: A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.
Gist of Idea
2: Change of motion is proportional to the force
Source
Isaac Newton (Principia Mathematica [1687], Axioms)
Book Ref
Newton,Isaac: 'Philosophical Writings' [CUP 2004], p.71
A Reaction
This gives the equation 'force = mass x acceleration', where the mass is the constant needed for the equation of proportion. Effectively mass is just the value of a proportion.
| 24064 | If something is pushed, it pushes back [Aristotle] |
| 19673 | Galileo mathematised movement, and revealed its invariable component - acceleration [Galileo, by Meillassoux] |
| 20964 | Descartes said there was conservation of 'quantity of motion' [Descartes, by Papineau] |
| 20968 | Newton's Third Law implies the conservation of momentum [Newton, by Papineau] |
| 15958 | Inertia rejects the Aristotelian idea of things having natural states, to which they return [Newton, by Alexander,P] |
| 17017 | 1: Bodies rest, or move in straight lines, unless acted on by forces [Newton] |
| 17019 | 3: All actions of bodies have an equal and opposite reaction [Newton] |
| 17018 | 2: Change of motion is proportional to the force [Newton] |
| 22173 | Galileo refuted the Aristotelian theory that heavier objects fall faster [Okasha] |
| 22618 | In modern physics the first and second laws of motion (unlike the third) fail at extremes [Ingthorsson] |