1. Chapter Gravitation
In this chapter we will explore the following topics:
-Newton’s law of gravitation that describes the attractive force between two point masses and its application to extended objects The acceleration of gravity on the surface of the earth, above it, as well as below it Gravitational potential energy Kepler’s three laws on planetary motion Satellites (orbits, energy , escape velocity)
(13-1)

2. m1 m2
(13-2)

3. m1 m2
F12
F21 r m1 m2 r F1 m2 m1
(13-3)

4. m1 dm r
(13-4)

5. (13-5)

6. y-axis
(13-6)

7. m2 m1 m1 m2 r F1
(13-7)

8. r m
(13-8)

9. (13-9)

10. m B
v = 0 v A
(13-10)

11. (13-11) Rotation Axis of the Celestial sphere Polaris Star earth

12. (13-12)

13. (13-13)

14. (13-14)

15. (13-15)