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01_intro1 - Physics 8 The Physics of Everyday Life David...

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Unformatted text preview: Physics 8: The Physics of Everyday Life David Tytler January 2008 UCSD: Physics 8; 2007 Course Goals Explore what physics has to say about the world we live in Physics has A LOT to say! Understand how some of our technological gizmos work TV, radio, cell phones Computers Microwave ovens GPS Electricity generation and use Look at the physics of living Food, exercise, radiation/cancer 05/07/09 2 UCSD: Physics 8; 2007 Course Goals, continued Learn to be more aware of physics in our lives In class questions reward you for doing this Watch demonstrations in class We also ask you questions about these, in class and in homework and exams Ask lots of questions Let curiosity run free Part of your credit is for posting questions to our website Explore the physics of our perceptions Sound, light, temperature Decide that physics is way cool, and not the worst course you ever had in college 05/07/09 3 UCSD: Physics 8; 2007 Course Structure/Grading Scheme 5% for question/observation Submit on line, due Tuesdays, except when midterm 27% for weekly homework done on line best 5 of 7, due Friday night 32% for a midterm exam We use only the better of the 2 36% for the final exam Up to 10% extra credit from classroom participation Determined from transmitter activity 3 points for correct 2 for wrong, 0 for no-answer 05/07/09 4 UCSD: Physics 8; 2007 Question/Observation Submission This is a course about curiosity questions/observations get you to participate in this feature of the course Something you've always wondered about Something you recently noticed Something that class prompted you to think about Goal is to increase your awareness, observational skills We're immersed in a physical universe that knows physics: easy to ignore, but also easy to see! You'll begin to think more deeply before shoving problem aside Submission via WebCT 05/07/09 5 UCSD: Physics 8; 2007 Question/Observation Examples Why do my cheerios cluster together in a little flotilla? Why does spaghetti get flexible right away when cooking, but takes a long time to be soft enough to eat? I've seen wheels on cars on the freeway at night appear to spin backwards, but have never noticed this during the day. Maybe it has something to do with the lighting... When I turn off my TV, the picture collapses into a small point in the center of the screen. Why? 05/07/09 6 UCSD: Physics 8; 2007 Transmitters The in-class response system has advantages: Stimulates discussion Provides practice on midterm like questions Gives you feedback about what they do/don't get Gives me feedback about what has/hasn't been covered well Gives you credit for attending and participating Purchase at Bookstore Only the 13-button (new, could be second hand) remotes work Register your number via WebCT "quiz" 05/07/09 7 UCSD: Physics 8; 2007 How to Use Transmitters Point the transmitter at a base units (not the screen) You see red LED light when you push a button. When the base records your answer, the light goes green A box will appear on the screen showing a portion of your remote id number or your screen name. The color comes from the last digit of your remote id number. The number after your screen name counts the number of changes Once you find your position on the screen it will stay there until I update the class list, or for the entire semester. 05/07/09 8 UCSD: Physics 8; 2007 WebCT Access Use WebCT to: Register transmitter Announcements (eg hints for homework) Submit questions/observations and homework Homework solutions Grades (listed by 3 digit code number handed out in class) How do you access it? You will automatically get an account about one day after registering for the class Extension students must bring proof of enrollment to ACS helpdesk in AP&M (Muir) Your password is the same as your ACS password for email 05/07/09 9 Resources Fellow students! WebCt Professor UCSD: Physics 8; 2007 You are encouraged to work together on HW, studying, etc. But you must submit your own work, not copied. David Tytler: Mon 4-5 SERF 428 tytler at ucsd edu, 858 534 7670 Teaching Assistant Physics Tutorial Help: Su-Th 3-8pm, Mayer Hall 2101 http://physics.ucsd.edu/students/courses/tutorialcenter/ James Wilson Wed 4-5 SERF 329 or 434 Jawilson at physics ucsd edu Discussion sessions optional Wed 4-4:50 WLH2005 Text How Things Work: The Physics of Everyday Life, 3rd edition, by Bloomfield 05/07/09 10 UCSD: Physics 8; 2007 How much Math? The course is mostly conceptual/qualitative But part of the power of physics is its quantitative description of our world Some experiments give answers that agree with theoretical expectation to 14 digits of precision! We'll dabble in the numbers, but it's never more complicated than , , , +, yx, and maybe averaging Sometimes we rearrange an equation: V = IR becomes I = V/R We use proportion There will be some seat-of-the-pants estimation problems too This may prove to be the hardest aspect, but not because of the math--it'll be because this is unfamiliar ... 05/07/09 11 UCSD: Physics 8; 2007 Expectations Attend Lectures and Discussion Sections Participate! If it doesn't make sense, ask! Everyone learns that way. Don't be bashful about answering questions posed. In-class voting system should make this fun Do the work: It's the only way this stuff will really sink in Midterms, final, homework and in-class questions are similar Explore, think, ask, speculate, admire, enjoy! Physics can be fun, enriching, pleasing in a similar way to art or music 05/07/09 12 UCSD: Physics 8; 2007 Any Questions on Course Structure? 05/07/09 13 UCSD: Physics 8; 2007 A Roadmap First couple weeks covering physics basics Motion, energy, force, power, electric forces, etc. We'll pick up other physics as we go The energetics of life Eating, exercising, moving through air & water What can we see? Light, color, weird natural phenomena What can't we see? Other electromagnetic radiation & application to cell phones, TV, radio, microwave ovens, heat (infrared), GPS What can we hear? What is sound? How do speakers, CDs, or ears work? 05/07/09 14 UCSD: Physics 8; 2007 Roadmap, continued How do we handle information? Digital storage, logic, computers, compression How do we get work done? Generating electricity Using electricity to do work: basic circuits The insides of our electronic devices Last part of course has time for topics you pick Topics of interest can come from weekly Q/A, voting via transmitter, e-mail to professor, spontaneous class discussions Keep your eyes open for things you'd like to know more about 05/07/09 15 UCSD: Physics 8; 2007 What kinds of things will you learn? How to look at and understand circuit diagrams How to look at your broken computer and point out resistors, transistors, capacitors, diodes, ICs How your remote control works (and see it work!) How the music you hear is recorded, digitized, stored, replayed How TV signals carry video information that you then see on the screen as an image How binary logic works and how this is implemented in computers as transistor blocks How much energy you'll use keeping your house warm 05/07/09 16 UCSD: Physics 8; 2007 Assignments Establish WebCT connectivity & register transmitter Read Chapter 1 of book You can skip sections on velocity, position of falling balls, as well as section on projectile motion (pp. 1521) M Jan14 (week 2) Transmitters will start counting W Jan16 by 11:55pm First Q due on WebCT F Jan18 First HW will due 11:55pm on WebCT 05/07/09 17 ...
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