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Physics I Class 18 Coulomb’s Law.

Published byἈλαλά Σερπετζόγλου Modified over 6 years ago

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Presentation on theme: "Physics I Class 18 Coulomb’s Law."— Presentation transcript:

1 Physics I Class 18 Coulomb’s Law

2 Important Announcement About Exam 2

3 Forces Known to Physics (Review)

4 A New Property of Matter - Charge

5 Conservation of Charge

6 Coulomb - A Man, A Unit, A Law

7 Coulomb’s Law of Electrostatic Force

8 Direction of Electrostatic Force “Opposites Attract”

9 Properties of Electrostatic Force Similarities with Gravity

10 Properties of Electrostatic Force Differences with Gravity

11 Comparison of Gravity and Electrostatic Force

12 Superposition of Electrostatic Forces

13 Two Ways of Calculating the Electric Force Vector

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

15 How to Calculate the Electric Force Vector (Prof. B’s Method)

16 Class #18 Take-Away Concepts

17 Class #18 Problems of the Day

18 Answer to Problem 1 for Class #18

19 Class #18 Problems of the Day

20 Answer to Problem 2 for Class #18

21 Activity #18 Coulomb’s Law

22 Class #18 Optional Material “Three Quarks for Muster Mark”

23 “Elementary” Particles An Embarrassment of Riches
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. Joseph F. Alward, PhD Department of Physics University of the Pacific

24 The Origin of Quark Theory
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. 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)

25 6 Quark Building Blocks Quarks Anti-Quarks Anti-Bottom

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