1. All course materials are available at vista.vista Online surveys at Vista (pre- and post-course) Physics 100 Pre-Course Survey Due 8am Monday, Sept 8, 2008.

2. Labs in Hebb 20 Section Lab time Tutorial time tutorial room L1C Tues 0930-1100 1100-1200 Hebb 10 L1D Tues 1400-1530 1530-1630 Hebb 10 L1E Wed 0800-0930 0930-1030 LSK 462 L1M Wed 1100-1230 1230-1330 Hebb 10 L1F Wed 1400-1530 1530-1630 Hebb 12 L1G Thur 0930-1100 1100-1200 Hebb 10 L1H Thur 1400-1530 1530-1630 Hebb 10 L1J Fri 1400-1530 1530-1630 Hebb 13 Tutorial time Lab time LC1 Tues 1000-1100 1100-1230 Hebb 10 LD1 Tues 1430-1530 1530-1700 Hebb 10 LE1 Wed 0830-0930 0930 -1100 LSK 462 LM1 Wed 1130-1230 1230-1400 Hebb 10 LF1 Wed 1430-1530 1530-1700 Hebb 12 LG1 Thurs 1000-1100 1100-1230 Hebb 10 LH1 Thurs 1430-1530 1530-1700 Hebb 10 LJ1 Fri 1430-1530 1530-1700 Hebb 13

3. At the beginning of each class: Hold your On/Off button for 2 seconds (the blue Power Light will flash) Enter [AA] Your “Vote Status” light will turn green after you’ve entered this new frequency. Your frequency is now changed for the duration of the lecture & you may vote. Setting up I-clicker

4. How do you vote? When I ask a question in class (and start the timer), select A, B, C, D, or E as your vote. I may also ask you to talk about your possible choice/answer with your neighbor or in groups.

5. Test of iClicker I am a 1)1st year college student; 2) 2nd year college student; 3) 3nd year college student

6. Phys100 section 102 L2: What to achieve? 1) Understand general physics “laws” Examples: Energy conservation law, Newton’s law, Coulomb’s law, Faraday’s Law, Maxwell’s Law, Boltzmann’s Law, the Law of quantum mechanics,…… 2) Understand the real world using laws/principles; Model the real world using basic laws/principles and analyze quantitatively a physical phenomenon.

7. Models “A model is a simplified description of reality…isolating the essential features, and developing a set of equations that provide an adequate, although not perfect description of reality.” “Physics, in particular, attempts to strip a phenomenon down to its barest essentials in order to illustrate the physical principles involved.“

8. Tools we are going to use Mathematics provides an extremely powerful tool to describe theories and to model or simulate reality. Experimental techniques including the data acquisition and analysis give us the ways to test theories/models and collect useful information of technologies and sciences.

9. Dimension of a physical quantity Dimension is associated with combinations of mass, length and time etc. D(Speed)=L/T D(Momentum)=M L / T If X=Y, D(X)=D(Y). This provides a way to check if your results make sense.

10. Dimensional analysis Ex: Formula for wavelength of light A scientist working in the field of applied optics obtained the following formula for the wavelength of light measured by an instrument: λ = (a 2 +b 2 /c)/d where a, b, c and d are the dimensions (in meters) of the different parts of the instrument. Q1. Is this formula correct? 1.Yes 2.No 3.Not enough information to decide

11. Units of a physical quantity Physical quantities have units. Examples. Important to use standardized SI units: m, kg, s, N, J, o K…. with appropriate prefixes We very often see other units such as cm, inches, miles, nautical miles, ft, pounds, o C, o F, etc. Need to convert units in problem sets. Examples: – 0.5  m = 5 x 10 -7 m. –1 inch = 25.4 mm =.0254 m

12. Driving to Seattle, we see that the speed limit on I-5 in Washington state is 70mile/h. This is close to A)10m/s; B) 20m/s; C) 30m/s; D) 40m/s.

13. It was reported that in the mid of last July in Phoenix, Arizona temperature reached 112F. This is about A)35C, B) 38C, C) 40C, D) 45C.