Newton: 1642-1727
•Principia published in 1687
•3 Law of motion
–1. A body
continues at rest or in uniform motion in a straight line unless acted upon by some force.
–2. A body’s
change of motion is proportional to the force acting on it and is in the direction of the
force.
–3. When one
body exerts a force on a second body, the second body exerts an equal and opposite force back
on the first body.
•Universal gravitation
–There is an attractive force between all bodies,
proportional to their
mass, and inversely proportional to the square of their distance.
