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, with webassign, through chap. 39 Scientific Calculator* iclicker* Laptop 30 cm metric ruler * - bring these to class Eric Carlson “Eric” “Professor Carlson” Olin 306 Office Hours always 758-4994 (o) 407-6528 (c) ecarlson@wfu.edu Topics Covered: 30% Electricity 30% Magnetism 30% Optics 10% Modern Physics Please Register your iClicker http://users.wfu.edu/ecarlson/phy114 http://www.webassign.net/student.html 1/11
Dr. Carlson’s Schedule Monday Tuesday Wednesday Thursday Friday 9:00 10:00 PHY 114 office hours PHY 114 office hours PHY 114 11:00 12:00 PHY 742 office hours PHY 742 office hours PHY 742 1:00 research research 2:00 research research research 3:00 Collins Hall 4:00 Free food colloquium 5:00
Preparing for Lecture Reading Assignment Sections 23.1 – 23.3 by Friday Sections 23.4 – 23.6 by Wednesday Quizzes: Reading quiz 23a by Friday Reading quiz 23b by Wednesday Read the material assigned on the Web, or in class each day, before class starts Take a webassign-based reading quiz online by 9:30 AM You only get one chance to answer these questions http://www.webassign.net/student.html
Class attendance, Seating, Participation I do not grade directly on attendance But it is basically necessary for class participation I will be taking attendance, usually Starting Wednesday, everyone will sit in the same seat every day (your choice which seat) Not the back row Do you understand how concept iclicker questions work? A) Yes, I’ve done it before B) Yes, though it’s new to me C) Sort of, I’ll figure it out D) Huh? Class Participation Grade and the iclicker I present a multiple choice question Round 1 – You must figure out or guess the answer, then vote with your iclicker 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
Homework, Webassign http://www.webassign.net/student.html All homework is on webassign Bookstore can sell you a license, or you can get it online Personalized problems, you need to get correct to 1% or better Handout about webassign is on the class web page Due almost every class day at 9:30 AM Personalized problems – you can’t copy Eight chances to get it right Getting help is encouraged Ask a friend, ask me, come to office hours First assignment is due on Wednesday of next week Groups will be provided to help you work on homework (or study, or whatever)
Exams Exam Dates: February 6 March 1 April 5 May 1, 9 AM 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/email me immediately or bring a Doctor’s note 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
Miscellaneous The Web Pandemic Plans Labs Tutorials Numerous materials can be found on the web for this course These lectures Math review Syllabus and other handouts Reading assignments and quizzes Test information If there is a catastrophic closing of the university, we will attempt to continue the class: Emergency contacts: Web page email Cell: 336-407-6528 http://users.wfu.edu/ecarlson/phy114 Labs Tutorials You are required to sign up for PHY 114L You must pass the lab to pass the class Labs begin on January 23 Days to be Determined Olin 101 Start next week?
Percentage Breakdown: Grades Percentage Breakdown: Test 1 12% Test 2 12% Test 3 12% Final 24% Homework 20% Lab 10% Class Part. 5% Read Quiz 5% Grade Assigned 94% A 73% C 90% A- 70% C- 87% B+ 67% D+ 83% B 63% D 80% B- 60% D- 77% C+ <60% F Little if any curving Do not allow extra credit
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
Red boxes mean memorize this, not just here, but always! SI Units Fundamental units Time second s Distance meter m Mass kilogram kg Temperature Kelvin K Charge Coulomb C Red boxes mean memorize this, not just here, but always! Derived units Force Newtons N kgm/s2 Energy Joule J Nm 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 Ns/C/m Magnetic Flux Weber Wb Tm2 Inductance Henry H Vs/A Metric Prefixes 109 G Giga- 106 M Mega- 103 k kilo- 1 10-3 m milli- 10-6 micro- 10-9 n nano- 10-12 p pico- 10-15 f femto-
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
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
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
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
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