1. 11 Gravity Kepler’s Laws Newton’s Law of Gravity
Gravitational Potential Energy
The Gravitational Field
Hk: 25, 33, 41, 47, 71.

2. Kepler’s Laws

6. Newton’s Law of Gravitation

7. Universal Law of Gravity
all matter is weakly attracted
attraction is inverse-square with distance
G = 6.67x10-11 N·m2/kg2
Example: Two 100kg persons stand 1.0m apart

8. Gravitational Potential Energy

9. g vs G
G is universal
g ~ Mass and Radius

10. Summary Kepler’s Laws Newton’s Law of Gravity
Gravitational Potential Energy
The Gravitational Field /