1/8/07 184 Lecture 1 1

PHY 184Physics for Scientists &

Engineers 2

PHY 184Physics for Scientists &

Engineers 2

Spring Semester 2007Lecture 1

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Meet Your Professor (1)Meet Your Professor (1)

Section 1 Prof. Reinhart Schienhorst

Section 2 Prof. Daniel Stump

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Meet Your Professor (2)Meet Your Professor (2)

Daniel Stump Ph. D. 1976 (M. I. T.) Teaching at MSU since 1980 Theoretical High-Energy Physics

Office hoursMon & Thu, 1:00 -2:30 pmLearning Center (Room 1248)

Best way to contact me – after class

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Comparing Data and Theory

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Meet Your Professor (2)Meet Your Professor (2)

Daniel Stump Ph. D. 1976 (M. I. T.) Teaching at MSU since 1980 Theoretical High-Energy Physics

Office hoursMon & Thu, 1:00 -2:30 pmLearning Center (Room 1248)

Best way to contact me – after class

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TextbookTextbook

Bauer and Westfall “Physics for Scientists and Engineers

2”, McGraw-Hill (2005).• Available at the MSU Bookstore

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PHY 184 on the WebPHY 184 on the Web

Web site:• http://www.pa.msu.edu/courses/phy184

Homework web site• http://msu.loncapa.org

Strosacker Learning Center in Room 1248 BPS (this building) will be our help room for LON-CAPA homework.

Coverage will be numerous and varied hours each week.

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LON-CAPA LoginLON-CAPA Login

Enter your MSU mail idEnter your MSU mail idEnter your passwordEnter your password

Enter msuEnter msu

Click or hit returnClick or hit return

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GradesGrades We grade on a fixed scale - no curve

What Counts %Midterm 1 20%Midterm 2 20%Final Exam 30%Homework 30%

Total 100%

What Grade92<x<1004.084<x<923.576<x<843.068<x<762.560<x<682.052<x<60 1.5

44<x<52 1.00<x<44 0.0

Up to 5% extra credit: In-class quizzes using HITT clickers

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To get a good grade in PHY 184, you’ll need to do 4 things:

/1/ Come to class, pay attention, take notes. (4 hours/wk)/2/ Do the reading. (2 hours/wk)/3/ Do the LON-CAPA homework. (8 hours/wk at least )/4/ Study for the exams. (10 hours the week before the exam)

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Clicker QuizzesClicker Quizzes

Enroll your clicker in LON-CAPA by giving your clicker ID!

HITT clickers – purchase at the bookstore

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Clicker Sign-upClicker Sign-up Registration in LON-CAPA: Course

document “Clicker”

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Schedule for PHY 184Schedule for PHY 184

Lectures• M, Tu, W, Th• 9:10 - 10:00

Two Midterm Exams• Thursday, February 8• Thursday, March 22

Final Exam • Time – Thursday May 3• Location - TBA

Homework due each Tuesday morning at 8:00 am

If you care about your grade, come to class !

Work on homework every day!

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Syllabus and ExamsSyllabus and Exams

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Electromagnetism

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Electricity and MagnetismElectricity and MagnetismElectricity and MagnetismElectricity and Magnetism

Electricity and magnetism have been known for thousands of years.• The philosophers of ancient Greece knew that a

piece of amber rubbed with fur would attract small, light objects

• The word for electron and electricity derive from the Greek word for amber, .

• Naturally occurring magnetic materials called lodestones were used as early as 300 BC to construct compasses.

The relationship between electricity and magnetism was not known until the middle of the 19th century.

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Fundamental Forces of NatureFundamental Forces of NatureFundamental Forces of NatureFundamental Forces of Nature

The force of gravity was described by Isaac Newton• Late 17th century

In the 20th century, two more forces were discovered• The weak force and the strong force – inside the atomic nucleus

The electromagnetic force and the weak force have a unified theory• The electroweak force• 1979 Nobel prize in physics for

Weinberg, Salam, and Glashow Currently physicists are working to

unify the electroweak force and the strong force.

Gravity remains a puzzle although it was identified first.

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The Four ForcesThe Four ForcesThe Four ForcesThe Four Forces

We think that the four fundamental forces work by exchanging elementary particles• Gravity - graviton (has not been observed)• Electromagnetic – photon (the elementary component of

light)

• Weak - W and Z bosons (first observed 1983, but unstable)

• Strong – gluons (first observed 1978, but confined)

Thus forces can act across distance (objects not touching)• The Sun attracts the Earth from 93 million miles

away• A magnet attracts iron.The forces act through the fields of the exchanged particles.

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Gravitational and Electric ForcesGravitational and Electric ForcesGravitational and Electric ForcesGravitational and Electric Forces

For gravity we defined a gravitational force…

…and a gravitational potential

We will do the same for the electric force and the electric potential.

We will develop the theory of the electric field to describe the electric force.

221

r

MGMF

rMGM

U 21

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Elementary ParticlesElementary ParticlesElementary ParticlesElementary Particles

Exchange particles

Leptons

Quarks

Force Particle

Gravity graviton

Electromagnetic photon

Weak W, Z

Strong gluon

electronelectron neutrino

muon muon neutrino

tau tau neutrino

down strange bottom

up charm top

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Fermi National Accelerator LaboratoryFermi National Accelerator LaboratoryFermi National Accelerator LaboratoryFermi National Accelerator Laboratory

Link