1. Physics 207: Lecture 1, Pg 1 Physics 207, Sections: 302/602 – 313/616 General Physics Faculty Instructors: Michael Winokur Deniz Yavuz Agenda for Today l Course Introduction  Course structure  Course scope  Begin chapter 1 Course Homepage: http://www.physics.wisc.edu/undergrads/courses/fall2010/207/ Physics 207: Text, Homework, Lecture, Discussion, Lab, Exams

2. Physics 207: Lecture 1, Pg 2 General Announcements l Text: Randall Knight, Physics for Scientists and Engineers with Modern Physics  Reading Assignments (due BEFORE class) For Wed. Sep. 8 th : Chapters 1 & 2 (2.1-2.4) Position, Time, Change (i.e. motion), Vectors, Units, Assessment  HW0: Due Thurs. 9/9 at 11:59 PM (Mastering Physics Practice Set ) Mastering Physics registration: see http://www.physics.wisc.edu/undergrads/courses/spring10/207/HW.htm Homework will usually be due by 11:59 PM on Tuesdays Homework will usually be due by 11:59 PM on Tuesdays with a 1% per hour penalty (up to 50% maximum)

3. Physics 207: Lecture 1, Pg 3 Announcements, cont’d l Labs  http://www.physics.wisc.edu/undergrads/courses/fall2010/207/labs.htm http://www.physics.wisc.edu/undergrads/courses/fall2010/207/labs.htm  Located in room 4310 Chamberlin Hall  Begin on Monday Sept. 13 (Expt. 1a & c)  Few formal write-ups, mostly worksheets Offered Mondays & Wednesdays, 8:50-9:40am l Lectures: Offered Mondays & Wednesdays, 8:50-9:40am (Revised notes will be posted at the course website) (Revised notes will be posted at the course website)

4. Physics 207: Lecture 1, Pg 4 Announcements, cont’d l Honors students: One Friday seminar per week (including exams weeks, may miss up to two) + group project In room 2131 Chamberlain (shared with Physics 201, starting on 9/13) l Drop in tutoring: In room 2131 Chamberlain (shared with Physics 201, starting on 9/13) http://www.physics.wisc.edu/undergrads/courses/current/207/consult.htm l Discussion Sections: Start Tuesday, one session centers on cooperative learning exercises (Th) and one on homework & class business (Tu)

5. Physics 207: Lecture 1, Pg 5 Grading l Several components:  Lecture: Occasional reading quizzes  Homework Sets (15%)  Exams: Three evening midterms (16%) and a final (22%)  Discussion section: (5%)  Participation/attendence  Labs: (10%)  Mostly worksheets (up to one formal write up)  May miss up to one lab (with a valid excuse) (final grade will be lowered if more)

6. Physics 207: Lecture 1, Pg 6 Lecture l Three main components :  Discussion class material »Selected topics from text  Demonstrations of physical phenomenon »Physics is an experimental science Example: Ping-pong ball bazooka  Interactive exercise with conceptual “Active Learning” problems »Critical thinking and problem solving (Almost no memorization required) Act

7. Physics 207: Lecture 1, Pg 7 A quick “quiz” on what not to do… l Please read and study the following paragraph for a minute or so. l “Last Fernday, George and Tony were in Donlon peppering gloopy saples and cleaming, burly greps. Suddenly, a ditty strezzle boofed into George’s grep. Tony blaired, “Oh George, that ditty strezzle is boofing your grep!” l After reading and studying the paragraph, and without referring to the paragraph, please answer the following questions:

8. Physics 207: Lecture 1, Pg 8 A quick “quiz” on what not to do… l 1. When were George and Tony in Donlon? l 2. What did the ditty strezzle do to George’s grep? l 3. What kind of saples did George and Tony pepper? l 4. What was Tony’s reaction? l 5. What do you imagine happened next? l 6. Based on the incidents in this story, do you think George and Tony will want to return to Donlon? Why or why not?

9. Physics 207: Lecture 1, Pg 9 A quick “quiz” on what not to do… l 1. When were George and Tony in Donlon? Fernday l 2. What did the ditty strezzle do to George’s grep? Boofed l 3. What kind of saples did George and Tony pepper? Gloopy l 4. What was Tony’s reaction? Blaired l 5. What do you imagine happened next? l 6. Based on the incidents in this story, do you think George and Tony will want to return to Donlon? Why or why not? So, do you think you did well on the quiz? What do you think you actually “learned”?

10. Physics 207: Lecture 1, Pg 10 Course Objectives l To begin to understand basic principles (e.g. Newton's Laws) and their consequences (e.g. conservation of momentum, etc.) l To solve problems using both quantitative and qualitative applications of these physical principles l To develop an intuition of the physical world l Rote use of formulas is not what physics is about

11. Physics 207: Lecture 1, Pg 11 Scope of Physics 207 l Classical Mechanics: : How and why things work.  Mechanics: How and why things work. Motion Motion (dynamics), balance (statics), energy, vibrationsClassical: »Not too fast (v << c), c ≡ speed of light »Not too small (d >> atom), atoms  10 -9 m l Most everyday situations can be described in these terms.  Path of baseball (or a ping pong ball)  Path of rubber ball bouncing against a wall  Vibrations of an elastic string (Vibration Demo) (These reflect Newton’s Laws and forces)  Properties of matter; a roll of the dice (Thermodynamics)

12. Physics 207: Lecture 1, Pg 12 Chapter 1: l Position (where) and Time (when)  Time  Displacement versus time (velocity)  Systems of units  Dimensional Analysis  Significant digits l At right is the world’s smallest biped: A single molecule of kinesin, walks along a cellular microtubule fiber, pulling along behind it a vesicle of nutrients çhttp://www.ted.com/index.php/talks/sheila_patek_clocks_the_fastest_animals.html

13. Physics 207: Lecture 1, Pg 13 Chapter 1 & 2 Objectives l Understand particle one-dimensional motion l Use motion diagrams l Distinguish position, velocity & acceleration l Gain experience with vector algebra l Understand proper use of significant figures l Understand position vs. time graphs

14. Physics 207: Lecture 1, Pg 14 Position and Time l An example below: Question: What is happening in the two time elapse sequences shown below? What construction could I use to quantify it?

15. Physics 207: Lecture 1, Pg 15 Random facts about the cardiovascular system l 15 million blood cells are produced and destroyed every second l 60,000 miles of blood vessels in our bodies l Red blood cells live 120 days l Smallest cross-section: 30 micron diameter capillary l Largest cross-section: 1 inch diameter (i.e., aorta)

16. Physics 207: Lecture 1, Pg 16 A preliminary step l Predicated on the need to know where and when? l Where requires a spatial reference frame and a system specifying position (magnitude, direction and units) l When requires a temporal reference frame (magnitude, direction and units) 1 2 3 4 5 6 6 54 3 2 1

17. Physics 207: Lecture 1, Pg 17 A preliminary step l Predicated on the need to know where and when? l Where requires a spatial reference frame and a system specifying position (magnitude, direction and units) l When requires a temporal reference frame (magnitude, direction and units) time 1 2 3 4 5 6 (sec.) position 1 2 3 4 5 6 (meters) A particle representation

18. Physics 207: Lecture 1, Pg 18 Different representations time (sec) 1 2 3 4 5 6 position 1 2 3 4 5 6 (meters) x (meters) t (seconds) 2 6 4 2 46 0 x = t · (1 meter/sec) Algebraic Pictorial Graphical displacement vector

19. Physics 207: Lecture 1, Pg 19 A slightly more complicated example time 1 2 3 4 5 6 (sec) x (meters) t (seconds) 2 6 4 2 46 0 x = x 0 + v 0 t + at 2 meters/sec Algebraic Pictoral Graphical displacement vector

20. Physics 207: Lecture 1, Pg 20 l Basic elements of substances and motion. fundamental quantities: l All things in classical mechanics can be expressed in terms of the fundamental quantities:  Length L  Mass M  Time T Standard Quantities l Some examples of more complicated quantities:  Speed has the quantity of L / T (i.e. miles per hour)  Acceleration has the quantity of L/T 2 (Chapter 2)  Force has the quantity of ML / T 2 (Chapter 4)

21. Physics 207: Lecture 1, Pg 21 Units l SI (Système International) Units:  mks: L = meters (m), M = kilograms (kg), T = seconds (s) l British Units:  L = inches, feet, miles, M = slugs (pounds), T = seconds l We will use mostly SI units, but you may run across some problems using British units. You should know how to convert back & forth. l Ask yourself, why do units matter?

22. Physics 207: Lecture 1, Pg 22 Recap l For Wednesday’s class » Work on HW0, start HW1 » Read Chapters 1 & 2 (through section 2.4)