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Day 1: Introductions / Welcome Review Electric Charges Review Electric Circuits

Using Physics to Understand the World: The Physics of Everyday Life. Physics 1020: Dr. Eleanor Hodby. Day 1: Introductions / Welcome Review Electric Charges Review Electric Circuits. Reminders: Register Your Clickers Reading for Thurs: 10.1, 10.3 Bloomfield.

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Day 1: Introductions / Welcome Review Electric Charges Review Electric Circuits

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  1. Using Physics to Understand the World:The Physics of Everyday Life Physics 1020: Dr. Eleanor Hodby Day 1: Introductions / Welcome Review Electric Charges Review Electric Circuits Reminders:Register Your Clickers Reading for Thurs: 10.1, 10.3 Bloomfield

  2. Physics is EVERYWHERE in everyday life • We live in an increasingly technological society • Example: Sending a message over the last century • Today, EVERYONE needs a basic grasp of • science for a successful society

  3. Course Goals 1. To have an interesting class that covers physics. 2. To begin to see science in everyday life. 3. To understand that the universe is predictable rather than incomprehensible. 4. To see that science (particularly physics) is based on quantitative experiments. 5. To learn to think logically in order to solve problems. Note: this is NOT an exercise in mathematics… We will use math, but only as a tool for understanding ideas / the world --- basic mathematics…

  4. 1020 Learning Team • 1020 Team: • Lecturer: Eleanor Hodby • TA: Kevin Givens • LAs: Samuel McDowell • Michael Stone Textbook: Bloomfield, ‘How things work’ (same as Phys 1010) • Website:http://www.colorado.edu/physics/phys1020/ • Contains everything you need to know about the course • (Syllabus, contact info, deadlines, dates, …) NOT taken 1010? See me after class.

  5. Important points about learning: • How much you get out of class (and University) is ultimately up to you. • Learn physics by “constructing” your understanding. • Everyone can learn, but takes time and effort. • Figuring out what you don’t understand and constructing a good question • will take you a long way towards the answer • Everyone gains by working together. • - Learn from helping and being helped • Note: • Variations in background and ease of understanding guarantee that material • is not at the perfect level for everyone • Easily fixed by coming to office hours /help sessions and discussing. • Easily turned into constant confusion and frustration by not keeping up!

  6. Features of Physics 1020 • Lectures and clicker questions • Weekly homework assignments • Reading quiz • Paper • 4 Labs • 3 in class exams plus final (no mid-term evening exams)

  7. 1. Lectures and Clickers Bring Pre-class notes, clicker and calculator to every lecture 1) Preclass notes will be posted on course website by Monday morning of each week (Suggest you bring these skeleton notes to take notes on) • 2) We will use clickers in EVERY lecture • - MUST REGISTER your clicker on CUconnect • - Clicker points policy: • 2 for participation per lecture (answer all questions) • 0-2 graded questions per lecture • Q: Do you have a clicker with you? • Yes • No • Don’t know Check you have in class points on CU learn this weekend If not, your clicker isn’t registered/working

  8. 2. Homework Assignments • Homework Assignments posted on webpage by noon on Monday. • Each Homework will be worth ~15-20 pts. • Target time investment is 4+ hours per week • Homework submitted at START of class on Tuesday. • NO late homeworks accepted. • 2 lowest HW scores dropped. No other adjustments. Do not waste these - • you will need them if you are ill later in the semester • Homework 1 due Tuesday 1/19! Problem solving sessions • Monday 2-3.30pm, Friday 4-5.30pm • Location: G2B87 (behind the helproom) • Come work on the homework with your classmates! Office/helproom hours EH: Thursday 12.45pm -1.45pm, Physics helproom And by appointment or email KG:

  9. CU Honor Code Collaboration vs. Plagiarism • Collaboration encouraged • Once you understand an idea write it down in your own words. • Representing ANYONE else’s work as your own is cheating. • If two answers are identical, both will get zero • Cheating will lead to failing the class.

  10. Example of HW answer • Q: I drop a egg A from a height of 1 m and egg B from a height of 2m. Which is travelling faster when it reaches the floor? • Physical principle: Conservation of energy • How applies: Initial gravitational potential energy (related to height of egg) = final kinetic energy (related to speed of egg) • How reach answer: initial PE = mgh Final KE = 0.5 mv2  mgh = 0.5mv2 m and g the same for each egg. If PE = KE, then bigger h means bigger v. Egg B dropped from 2m will be travelling faster. • Clarity: • Include every step of your argument or calculations • BUT keep it succinct – don’t woffle Useful handout on ‘ a logical approach to problem solving’ in this week’s reading – available on course homepage

  11. 3. Reading Quiz • Clicker questions at start of Tuesday lecture (1pt per question) • This weeks reading: 10.1, 10.3 by Thursday, 10.2 by next Tuesday • Quiz next Tuesday • 4. Paper • Short written paper and oral presentation • Apply physics to explain something of interest to you not covered by class. • 5. Labs • Labs- only 4 weeks during term! Labs very gentle. • Weeks 3, 5, 7, 9. Presentation week 15 • Hands on involvement with physics being covered in the class. • Honest effort will get reasonable grade. • Must pass ALL the labs to pass course. BE THERE. • To switch lab sections, see me after class today

  12. Final grades Final grades are based on the total number of points earned throughout the semester In-class Reading Quizzes 3 pts x ~10 Homeworks ~15-20 pts x ~12 (Lowest 2 dropped) Lab: Group Lab Reports 15 pts x 4 Lab: Individual Participation 5 pts x 4 (must do all 4 to pass) Paper draft 20pts x1 Paper final 40pts x1 In-class quest. (Clickers) 2-4 pts x 25 (Lowest 3 dropped) Hour Exams 40 pts x 3 (Lowest dropped) Final Exam 80 pts x 1

  13. Final grades 2 • Most important for good grade is do all the assignments! • - Missing class and homework put you in danger of failing, no matter • how well you do on the exams! • - Do all assignments well, get B even if lousy on exams. • Lowest hour exam, 2 lowest weekly homework score and 3 lowest in-class • scores (reading / clickers) will be thrown out. • - Covers illness, car wrecks, computer crash, forgetting etc., • - You can miss two week’s homework, one week of class, and one exam • without penalty. • - Don’t waste now, you will probably need later!

  14. 1020 Topics Part 1: Electricity Review, Copiers, Electric Power Plants and the Power Grid. Part 2:Sound, Speakers, and Radios, TV. Part 3: Sunlight, light, and color, Lasers, 35 mm Cameras and Digital Cameras, Optical Storage & Communication Part 4: Balloons--Hot air and helium Part 5: Nuclear weapons and Medical Imaging (x-ray, MRIs, etc) Part 6: Cosmology (origin, size, composition, evolution of universe, what they are and how we know. ) This schedule is flexible and depends partly on your interests Talk to us - we will hear you and will respond……..usually :0)

  15. Balloon demos of electrostatic charges 1. Remember - rub balloon on hair, stick on wall. 2. Rubbing two balloons on hair, will they: a) repel b) attract? How to figure out? 1st step in process? Other information or reasoning that checks your answer?

  16. VandeGraaff generator • Belt piles charges onto sphere • Builds up huge voltage on sphere • (up to 5MV for a big generator)

  17. Pom-pom demo • Attach Pom-pom to top of VdG and turn on. • What will happen? • Nothing • Sparks will fly from pom-pom • Nasty smell of burning pom-pom will develop • Pom-pom strands will stand on end and repel each other How to figure out? 1st step in process? Other information or reasoning that checks your answer?

  18. Demo of pie plates stacked on Vandegraaff. Turn on VG, put lots of extra electrons on it. What will happen to the plates? a. nothing, will stay there. b. all will fly off at same time and stick together. c. top one will fly off, then next to top then next etc. d. all will fly off at same time and separate. - - - How to figure out? 1st step in process? Other information or reasoning that checks your answer? - - X-section, just after turn on

  19. Now hook up wire to middle plate. Turn on VG, what happens to the plates? a. nothing, will all stay there. b. top one will fly off, then next to top then next etc. c. only ones above where wire is hooked will fly off. d. all above wired plate will all fly off at same time . e. something else - - - - - X-section, just after turn on

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