1. Physics 114 – General Physics II
Everyone Pick Up:
Syllabus
Student Info sheet – fill it out
Materials
Physics for Scientists and Engineers, 9th ed., Serway and Jewett, through chap. 40
Scientific Calculator*
Tophat
Laptop/Mobile Device*
30 cm metric ruler
* - bring these to class
Ryan Godwin
“Professor (Dr.) Godwin”
Olin 311
Office Hours always
(520) (c)
Topics Covered:
30% Electricity
30% Magnetism
30% Optics
10% Modern Physics

2. Dr. Godwin’s Schedule Monday Tuesday Wednesday Thursday Friday PHY 114
Office Hours
9:00
9:30
10:00
10:30
11:00
11:30
12:00

3. Preparing for Lecture Reading Assignment
Website Overview
Reading Assignment
Sections 23.1 – 23.5 by Thursday
Sections , by Tuesday
Quizzes:
Reading quiz 23a by Thursday
Reading quiz 23b by Tuesday
Read the material assigned on the Web, or in class each day, before class starts
Take a Tophat-based reading quiz online by 9:30 AM
Tophat Introduction

4. Class attendance & Participation
I grade a very small portion based on attendance
It is basically necessary for class participation
I will be taking attendance, at the very beginning of class via Tophat. Be on time!
Do you understand how concept questions work?
Yes, I’ve done it before
Yes, it’s just like iClickers
B) Yes, though it’s new to me
C) Sort of, I’ll figure it out
D) Huh?
Class Participation Grade and in class questions
I present a multiple choice question
Round 1 – You must figure out or guess the answer, then vote with your mobile device or laptop
You discuss the questions with your classmates
Round 2 – You get a second chance to get the answer right
Right answers: 4/4, wrong answers: 3/4
If you get 80% or more, you get full credit on class participation
Participating in class discussion gains bonus points that can push up your participation grade, even past full credit

5. https://app.tophat.com/e/214952
Homework, Serway + Tophat
All homework will be based on questions in Serway.
They will either be posted in the lecture notes (turn in on paper) or in Tophat
Bookstore can sell you a license, or you can get it online
Partial credit awarded – attempt each problem and work to completion
Link to tophat is on the class web page
Due weekly – every Tuesday at 9:30 AM
You can work together, but everyone must turn in their own work
Make sure you understand every problem – tests will make it clear if you don’t
Getting help is encouraged
Ask a friend, ask me, come to office hours
First assignment is due on Tuesday of next week
Groups will be provided to help you work on homework (or study, or whatever)

6. Exams Exam Dates: September 19 October 10 November 14 Dec 13, 2 PM
3 tests and a final
Honors code violations will be turned in to the honor council
Normally, penalty is 1-term suspension and an irreplaceable F in the course
Multiple choice, short essay and computational problems
If ill, call me/ me immediately or bring a Doctor’s note
Exam Dates:
September 19
October 10
November 14
Dec 13, 2 PM
Red dashed line means you should be able to use this on a test, but you needn’t memorize it
Red boxes mean memorize this for the test
Other colors mean not on the test
Dotted red means easily derived from other formulas

7. Miscellaneous The Web Pandemic Plans Labs Tutorials
Numerous materials can be found on the web for this course
Lectures
Syllabus and other handouts
Reading assignments and quizzes
Test information
Additional Resources
If there is a catastrophic closing of the university, we will attempt to continue the class:
Emergency contacts:
Web page
Cell:
Labs
Tutorials
You are required to sign up for PHY 114L
You must pass the lab to pass the class
Labs begin week of September 4th
Days to be Determined
Olin 101
Start next week?

8. Percentage Breakdown:
Grades
Percentage Breakdown:
Test 1 9%
Test 2 9%
Test 3 9%
Final 25%
Homework 20%
Lab 10%
Part./Quiz %
Project 7%
Grade Assigned
93% A 73% C
90% A- 70% C-
87% B+ 67% D+
83% B 63% D
80% B- 60% D-
77% C+ <60% F
Possibility of curving
Do not allow extra credit

9. Background Information
Prerequisites
Physics: PHY 113 (or 111), mechanics, etc.
You should have a good understanding of basic physics
Be familiar with units and keeping track of them, scientific notation
Should know key elementary formulas like F = ma
Mathematics: MTH 111, introductory calculus
Know how to perform derivatives of any function
Understand definite and indefinite integration
Work with vectors either abstractly or in coordinates
There is a math review online with everything you need to know

10. Red boxes mean memorize this, not just here, but always!
SI Units
Red boxes mean memorize this, not just here, but always!
Fundamental units
Time (second) s
Distance (meter) m
Mass (kilogram) kg
Temperature (Kelvin) K
Charge (Coulomb) C
Derived units
Force (Newtons) N kgm/s2
Energy (Joule) J Nm
Power (Watt) W J/s
Frequency (Hertz) Hz s-1
Elec. Potential (Volt) V J/C
Capacitance (Farad) F C/V
Current (Ampere) A C/s
Resistance (Ohm)  V/A
Mag. Field (Tesla) T Ns/C/m
Magnetic Flux (Weber) Wb Tm2
Inductance (Henry) H Vs/A
Metric Prefixes
G Giga-
106 M Mega-
k kilo- 1
m milli-
 micro-
n nano-
p pico-
Check units! Quick example – Work, KE, PE

11. Vectors A scalar is a quantity that has a magnitude, but no direction
Mass, time, temperature, distance
In a book, denoted by math italic font
A vector is a quantity that has both a magnitude and a direction
Displacement, velocity, acceleration
In books, usually denoted by bold face
When written, usually draw an arrow over it
In three dimensions, any vector can be described in terms of its components
Denoted by a subscript x, y, z
The magnitude of a vector is how long it is
Denoted by absolute value symbol, or same variable in math italic font z y vx vz vy x

12. Finding Components of Vectors
If we have a vector in two dimensions, it is pretty easy to compute its components from its magnitude and direction y v vy
We can go the other way as well vx x
In three dimensions it is harder

13. Unit Vectors We can make a unit vector out of any vector
Denoted by putting a hat over the vector
It points in the same direction as the original vector
The unit vectors in the x-, y- and z-direction are very useful – they are given their own names
i-hat, j-hat, and k-hat respectively
Often convenient to write arbitrary vector in terms of these

14. Adding and Subtracting Vectors
To graphically add two vectors, just connect them head to tail
To add them in components, just add each component
Subtraction can be done the same way

15. Multiplying Vectors There are two ways to multiply two vectors
The dot product produces a scalar quantity
It has no direction
It can be pretty easily computed from geometry
It can be easily computed from components
The cross product produces a vector quantity
It is perpendicular to both vectors
Requires the right-hand rule
Its magnitude can be easily computed from geometry
It is a bit of a pain to compute from components

16. Electricity q b a s r  z
50 kV
Dirty air
Cleanair + -

17. Electricity Electric Fields Electric Charge
Electric forces affect only objects with charge
Charge is measured in Coulombs (C). A Coulomb is a lot of charge
Charge comes in both positive and negative amounts
Charge is conserved – it can neither be created nor destroyed
Charge is usually denoted by q or Q
There is a fundamental charge, called e
All elementary particles have charges that are simple multiples of e
Particle q
Proton e
Neutron 0
Electron -e
Oxygen nuc. 8e
++ 2e
Red dashed line means you should be able to use this on a test, but you needn’t memorize it

18. Charge Can Be Spread Out
Charge may be at a point, on a line, on a surface, or throughout a volume
Linear charge density  units C/m
Multiply by length
Surface charge density units C/m2
Multiply by area
Charge density units C/m3
Multiply by volume

19. Concept Question
A box of dimensions 2 cm 2 cm  1 cm has charge density  = 5.0 C/cm3 throughout and linear charge density  = – 3.0 C/cm along one long diagonal. What is the total charge?
A) 2 C B) 5 C C) 11 C D) 29 C E) None of the above
– 3.0 C/cm
2 cm
5.0 C/cm3
1 cm
2 cm

20. The Nature of Matter
Matter consists of positive and negative charges in very large quantities
There are nuclei with positive charges
Surrounded by a “sea” of negatively charged electrons +
To charge an object, you can add some charge to the object, or remove some charge
But normally only a very small fraction
10-12 of the total charge, or less
Electric forces are what hold things together
But complicated by quantum mechanics
Some materials let charges move long distances, others do not
Normally it is electrons that do the moving
Insulators only let their charges move a very short distance
Conductors allow their charges to move a very long distance

21. Some ways to charge objects
By rubbing them together
Not well understood
By chemical reactions
This is how batteries work
By moving conductors in a magnetic field
Get to this in October
By connecting them to conductors that have charge already
That’s how outlets work
Charging by induction
Bring a charge near an extended conductor
Charges move in response
Separate the conductors
Remove the charge – + – + +

22. Coulomb’s Law Like charges repel, and unlike charges attract
The force is proportional to the charges
It depends on distance q1 q2
Other ways of writing this formula
The r-hat just tells you the direction of the force
When working with components, often helps to rewrite the r-hat
Sometimes this formula is written in terms of a quantity0 called the permittivity of free space