Newton Has Said More than Kepler!
Kepler’s Laws describe the motion of a planet about the Sun.
Newton uses same laws that apply to all motion!
Newton’s framework (forces & masses) allows him to generalize from the Sun-planet system to all bodies in the universe! This is “universal” gravitation!
Newton’s Third Law implies that each body exerts equal and opposite forces on the other. Depends upon both masses.
- Describes the moon orbiting the earth
- The moons of Jupiter, and much more!
- Totally different from Kepler’s approach.