1. 17-1 Physics I Class 17 Newton’s Theory of Gravitation

2. 17-2 Forces Known to Physics

3. 17-3 Forces in Physics 1 (so far)

4. 17-4 Newton’s Theory of Gravitation

5. 17-5 Newton’s Law of Universal Gravitation

6. 17-6 Properties of Gravity

7. 17-7 If Gravity Varies As 1/r 2, Where Does g = 9.8 m/s 2 Fit In?

8. 17-8 Gravity is a Conservative Force

9. 17-9 We Have Two Formulas for Gravitational Potential Energy!

10. 17-10 Class #17 Take-Away Concepts

11. 17-11 Class #17 Problems of the Day

12. 17-12 Class #17 Problems of the Day

13. 17-13 Activity #17 Gravitation

14. 17-14 Class #17 Optional Material Part A - Kepler’s Laws of Orbits Material on Kepler’s Laws thanks to Professor Dan Sperber

15. 17-15 Kepler’s Three Laws of Planetary Motion 1. The Law of Orbits: All planets move in elliptical orbits having the Sun at one focus. 2. The Law of Areas: A line joining any planet to the Sun sweeps out equal areas in equal times. 3. The Law of Periods: The square of the period of any planet about the Sun is proportional to the cube of the semi-major axis of its orbit.

16. 17-16 Kepler’s Three Laws of Planetary Motion

17. The Law of Areas

18. The Law of Periods

19. ENERGY IN CIRCULAR ORBITS

20. 17-20 Class #17 Optional Material Part B - General Relativity Material on General Relativity thanks to Albert Einstein

21. 17-21 Where Did Newton Go Wrong? (Again!)

22. 17-22 The Principle of Equivalence

23. 17-23 The Principle of Equivalence

24. 17-24 General Theory of Relativity

25. 17-25 Black Holes

26. 17-26 If Newton’s Gravity isn’t true, why do we still use it? Massive Black Holes In Galaxies NGC 3377, NGC 3379 And NGC 4486B