Isaac+Newton+Page

=Sir Isaac Newton =





**Sir Isaac Newton** [|PRS] (25 December 1642 – 20 March 1727 [[|NS]: 4 January 1643 – 31 March 1727])[|[1]] was an English [|physicist], [|mathematician], [|astronomer], [|natural philosopher], [|alchemist], and [|theologian], has been "considered by many to be the greatest and most influential scientist who ever lived."[|[7]]

His monograph [|//Philosophiæ Naturalis Principia Mathematica//], published in 1687, lays the foundations for most of [|classical mechanics]. In this work, Newton described [|universal gravitation] and [|the three laws of motion], which dominated the scientific view of the physical [|universe] for the next three centuries. Newton showed that the motions of objects on [|Earth] and of [|celestial] bodies are governed by the same set of natural laws, by demonstrating the consistency between [|Kepler's laws of planetary motion] and his theory of gravitation, thus removing the last doubts about [|heliocentrism] and advancing the [|Scientific Revolution]. The Principia is generally considered to be one of the most important scientific books ever written.

__** First Law of Motion **__ Objects at rest tend to stay at rest Objects in motion tend to stay in motion In a straight line At a constant speed, Until acted on by an unbalanced force

__** Second Law of Motion **__ **Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). **

However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation:
F=MA

 or FORCE = MASS times ACCELERATION

__** Third Law of Motion **__

For every action there is an equal and opposite re-action.
== This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard. ==