Day 1: Introductions / WelcomeReview Electric ChargesReview Electric Circuits

Reminders:Register Your Clickers

Reading for Thurs: 10.1, 10.3 Bloomfield

Using Physics to Understand the World:The Physics of Everyday Life

Physics 1020: Dr. Eleanor Hodby

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

Course Goals1. 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…

1020 Team: Lecturer: Eleanor HodbyTA: Kevin GivensLAs: 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.

1020 Learning Team

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!

Features of Physics 1020

1. Lectures and clicker questions

2. Weekly homework assignments

3. Reading quiz

4. Paper

5. 4 Labs

6. 3 in class exams plus final (no mid-term evening exams)

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

1. Lectures and Clickers

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)

Check you have in class points on CU learn this weekendIf not, your clicker isn’t registered/working

Q: Do you have a clicker with you?a) Yesb) Noc) Don’t know

Bring Pre-class notes, clicker and calculator to every lecture

• 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!

2. Homework Assignments

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 hoursEH: Thursday 12.45pm -1.45pm, Physics helproom And by appointment or emailKG:

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.

CU Honor Code

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

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

In-class Reading Quizzes 3 pts x ~10Homeworks ~15-20 pts x ~12 (Lowest 2 dropped)Lab: Group Lab Reports 15 pts x 4Lab: Individual Participation 5 pts x 4 (must do all 4 to pass)Paper draft 20pts x1Paper final 40pts x1In-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

Final grades

Final grades are based on the total number of points earned throughout the semester

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!

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, whatthey 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)

1. Remember - rub balloon on hair, stick on wall.2. Rubbing two balloons on hair, will they:

a) repelb) attract?

How to figure out? 1st step in process? Other information or reasoning that checks your answer?

Balloon demos of electrostatic charges

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

VandeGraaff generator

Pom-pom demo

Attach Pom-pom to top of VdG and turn on. What will happen?a) Nothingb) Sparks will fly from pom-pomc) Nasty smell of burning pom-pom will developd) 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?

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.

Demo of pie plates stacked on Vandegraaff.Turn on VG, put lots of extra electrons on it. What will happen to the plates?

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How to figure out? 1st step in process? Other information or reasoning that checks your answer?

X-section, just after turn on

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

Now hook up wire to middle plate.

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X-section, just after turn on