1. Gravitation Two-Body System

2. Gravitation m1m1 m2m2 F 12 F 21

3. Position - Velocity - Acceleration x y

4. Cartesic Coordinates x y y x

5. Cartesic Coordinates Velocity x y y x

6. Cartesic Coordinates Acceleration x y y x

7. Polar Coordinates x y

8. Polar Coordinates Changes of unit vectors x y

9. Polar Coordinates Velocity x y

10. Polar Coordinates Acceleration x y

11. x y

12. Two-Body System Newton’s Laws m1m1 m2m2 F 12 F 21

13. Two-Body System Reduction to one-particle problem m1m1 m2m2 F 12 F 21

14. Two-Body System Angular Momentum m1m1 m2m2 F 12 F 21

15. Two-Body System Differential Equation r m1m1 m2m2 F 12 F 21

16. Two-Body System Equation r, r 1, r 2 m1m1 m2m2 F 12 F 21

17. Two-Body System Solution of Differential Equation

18. Two-Body System Solution

19. Two-Body System Solution - Different Path

20. End