Physics I Class 18 Coulombs Law 1 Important
Physics I Class 18 Coulomb’s Law 1
Important Announcement About Exam 2 2
Forces Known to Physics (Review) 3
A New Property of Matter Charge 4
Conservation of Charge 5
Coulomb - A Man, A Unit, A Law 6
Coulomb’s Law of Electrostatic Force 7
Direction of Electrostatic Force “Opposites Attract” 8
Properties of Electrostatic Force Similarities with Gravity 9
Properties of Electrostatic Force Differences with Gravity 10
Comparison of Gravity and Electrostatic Force 11
Superposition of Electrostatic Forces 12
Two Ways of Calculating the Electric Force Vector 13
How to Calculate a Unit Direction Vector A “unit vector” is a special vector with dimensionless length of one unit. 14
How to Calculate the Electric Force Vector (Prof. B’s Method) 15
Class #18 Take-Away Concepts 16
Class #18 Problems of the Day 17
Answer to Problem 1 for Class #18 18
Class #18 Problems of the Day 19
Answer to Problem 2 for Class #18 20
Activity #18 Coulomb’s Law 21
Class #18 Optional Material “Three Quarks for Muster Mark” 22
“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, Ph. D Department of Physics University of the Pacific 23
The Origin of Quark Theory 1929 - 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) 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 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. 24
6 Quark Building Blocks Quarks Anti-Bottom 25
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