Physics I Class 18

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Physics IClass 18
Coulombs Law
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Forces Known to Physics(Review)
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A New Property of Matter -Charge
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Conservation of Charge
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Coulomb - A Man, A Unit, A Law
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Coulombs Law ofElectrostatic Force
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Direction of Electrostatic ForceOpposites
Attract
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Properties of Electrostatic ForceSimilarities
with Gravity
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Properties of Electrostatic ForceDifferences
with Gravity
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Comparison of Gravity and Electrostatic Force
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Superposition ofElectrostatic Forces
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Two Ways of Calculating theElectric Force Vector
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Class 18Take-Away Concepts
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Class 18Problems of the Day
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Class 18Problems of the Day
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Activity 18Coulombs Law
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Class 18 Optional Material A Prof. Bs Method
of Calculation
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How to Calculate aGeneral Unit Direction Vector
A unit vector is a specialvector with
dimensionlesslength of one unit.
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How to Calculate the Electric Force Vector (Prof.
Bs Method)
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Class 18 Optional Material BThree Quarks for
Muster Mark
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Elementary ParticlesAn 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 1960s that these
particles must themselves be combinations of
deeper fundamental particles.
Joseph F. Alward, PhD Department of Physics
University of the Pacific
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The Origin of Quark Theory
1929-
In the early 1960s, 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 tookthe name quark from "Three
quarks for musterMark", in James Joyce'sbook
Finnegan's Wake.(1963) (Nobel Prize 1969)
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6 Quark Building Blocks
Quarks
Anti-Quarks
Anti-Bottom