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1/8/07 184 Lecture 1 1
PHY 184Physics for Scientists &
Engineers 2
PHY 184Physics for Scientists &
Engineers 2
Spring Semester 2007Lecture 1
1/8/07 184 Lecture 1 2
Meet Your Professor (1)Meet Your Professor (1)
Section 1 Prof. Reinhart Schienhorst
Section 2 Prof. Daniel Stump
1/8/07 184 Lecture 1 3
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
1/8/07 184 Lecture 1 5
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
1/8/07 184 Lecture 1 6
TextbookTextbook
Bauer and Westfall “Physics for Scientists and Engineers
2”, McGraw-Hill (2005).• Available at the MSU Bookstore
1/8/07 184 Lecture 1 7
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.
1/8/07 184 Lecture 1 8
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
1/8/07 184 Lecture 1 9
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
1/8/07 184 Lecture 1 10
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)
1/8/07 184 Lecture 1 11
Clicker QuizzesClicker Quizzes
Enroll your clicker in LON-CAPA by giving your clicker ID!
HITT clickers – purchase at the bookstore
1/8/07 184 Lecture 1 12
Clicker Sign-upClicker Sign-up Registration in LON-CAPA: Course
document “Clicker”
1/8/07 184 Lecture 1 13
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!
1/8/07 184 Lecture 1 16
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.
1/8/07 184 Lecture 1 17
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.
1/8/07 184 Lecture 1 18
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.
1/8/07 184 Lecture 1 19
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.
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rMGM
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1/8/07 184 Lecture 1 20
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