1. 18-1 Physics I Class 18 Coulomb’s Law

2. 18-2 Forces Known to Physics (Review)

3. 18-3 A New Property of Matter - Charge

4. 18-4 Conservation of Charge

5. 18-5 Coulomb - A Man, A Unit, A Law

6. 18-6 Coulomb’s Law of Electrostatic Force

7. 18-7 Direction of Electrostatic Force “Opposites Attract”

8. 18-8 Properties of Electrostatic Force Similarities with Gravity

9. 18-9 Properties of Electrostatic Force Differences with Gravity

10. 18-10 Comparison of Gravity and Electrostatic Force

11. 18-11 Superposition of Electrostatic Forces

12. 18-12 Two Ways of Calculating the Electric Force Vector

13. 18-13 Class #18 Take-Away Concepts

14. 18-14 Class #18 Problems of the Day

15. 18-15 Class #18 Problems of the Day

16. 18-16 Activity #18 Coulomb’s Law

17. 18-17 Class #18 Optional Material A Prof. B’s Method of Calculation

18. 18-18 How to Calculate a General Unit Direction Vector A “unit vector” is a special vector with dimensionless length of one unit.

19. 18-19 How to Calculate the Electric Force Vector (Prof. B’s Method)

20. 18-20 Class #18 Optional Material B “Three Quarks for Muster Mark”

21. 18-21 “Elementary” Particles An Embarrassment of Riches Joseph F. Alward, PhD Department of Physics University of the Pacific Beginning with the discovery of the electron in 1898, physicists encountered an increasing array of so-called “elementary” particles. It became evident to physicists in the 1960’s that these particles must themselves be combinations of deeper fundamental particles.

22. 18-22 The Origin of Quark Theory Murray Gell-Mann took the name quark from "Three quarks for muster Mark", in James Joyce's book Finnegan's Wake. (1963) (Nobel Prize 1969) 1929- In the early 1960’s, Gell-Mann and others proposed the Quark Theory to explain the “elementary” particles and their interactions in terms of 3 deeper fundamental particles called quarks. Further developments have shown there are actually 6 different quarks and their corresponding anti-quarks. The quarks and their properties have been given whimsical names like “charm” that have no physical significance.

23. 18-23 6 Quark Building Blocks QuarksAnti-Quarks Anti-Bottom