That s how we roll. Physics 20: General Physics Part 1. Agenda. Administrative Stuff. About Me. Goals For This Class 1/16/14.

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Physics 20: General Physics Part 1 Agenda Today: Syllabus overview, mechanics pretest Thursday: Units, sig figs, measurement Reading for Thursday: Chapter 1 Key ideas: Particle model, position &

1 Physics 20: General Physics Part 1 Agenda Today: Syllabus overview, mechanics pretest Thursday: Units, sig figs, measurement Reading for Thursday: Chapter 1 Key ideas: Particle model, position & velocity, sig figs & units That s how we roll. About Me My offices are Bussman 1471 and Lark 2023 Come say hello! Best place to ask questions (besides during class) is office hours T 2-3:30PM and Th 10-11:30AM, or by appt. Best way to contact me is jfielder@sfsu.edu put Phys 20 in the subject line Enrollment Wait List Prerequisites Administrative Stuff Lab (Physics 20L) Textbook Phys20S14.html Goals For This Class Help you develop: A thorough understanding of the central concepts of physics The ability to solve complex problems using physics concepts 1

2 Participation 10% of your final grade is class participation Short writing assignments Group activities Voting If you miss class, you cannot make up the participation credit Homework About 1 assignment per week Problems from textbook & conceptual questions Working in groups is encouraged, but the work you turn in must be your own. Problem sets are spot-checked, understanding assessed with quizzes Homework is 30% of your final grade (so each assignment is worth about 2%) Exams 3 midterms (15% each) and a final (15%) multiple choice and some short problems Exam dates are not flexible DO NOT MISS EXAMS! THERE ARE NO MAKEUPS! Grades Homework 30% Participation 10% Midterms (3 x 15% each) 45% Final Exam 15% I do not offer lots of extra credit, but exams and overall grades may be curved. If you need to talk about your grade in detail, let me know. The Montillation of Traxoline Syllabus Questions? It is very important that you learn about traxoline. Traxoline is a new form of zionter. It is montilled in Ceristanna. The Ceristannians gristerlate large amounts of fevon and then brachter it to quasel traxoline. Traxoline may well be one of our most lukized snezlaus in the future because of our zionter lescelidge. (attributed to the insight of Judy Lanier) 2

The Montillation of Traxoline It is very important that you learn about traxoline. Traxoline is a new form of zionter. It is montilled in Ceristanna.

A Commonly Held Incorrect Model of a Student s Conceptual Framework Directions: Answer the following questions in complete sentences. Be sure to use your best handwriting. 1. What is traxoline? 2.

tabla rasa A Commonly Held Incorrect Model of Teaching and Learning If a bowling ball and a baseball are both dropped from the same height at the same time, which one will reach the ground first? A. The bowling ball, because it has more mass B.

3 The Montillation of Traxoline It is very important that you learn about traxoline. Traxoline is a new form of zionter. It is montilled in Ceristanna. The Ceristannians gristerlate large amounts of fevon and then brachter it to quasel traxoline. Traxoline may well be one of our most lukized snezlaus in the future because of our zionter lescelidge. A Commonly Held Incorrect Model of a Student s Conceptual Framework Directions: Answer the following questions in complete sentences. Be sure to use your best handwriting. 1. What is traxoline? 2. Where is traxoline montilled? 3. How is traxoline quaselled? 4. Why is it important to know about traxoline? tabla rasa A Commonly Held Incorrect Model of Teaching and Learning If a bowling ball and a baseball are both dropped from the same height at the same time, which one will reach the ground first? A. The bowling ball, because it has more mass B. The baseball, because it has less mass C. The bowling ball, because it is larger in size D. They will reach the ground at about the same time E. None of the above Agenda Physics can be BIG! Today: Pre-test, Chapter 1 Homework #1 due on Tuesday: Chapter 1 problems 10, 12, 14, 20, 26, 28, and 30 Reading for next week: Chapter 2 (try to get through the whole chapter over the weekend, but at least finish it before class on Thursday) 3

SI Units: The Système International or mks Length: meter (m) Mass: kilogram (kg) Time: second (s) Force: newton (N) Energy: joule (J) Current: ampere (A) Temperature: kelvin (K) Metric System (Units

4 SI Units: The Système International or mks Length: meter (m) Mass: kilogram (kg) Time: second (s) Force: newton (N) Energy: joule (J) Current: ampere (A) Temperature: kelvin (K) Metric System (Units of Length) Everything is based on the meter (m) 1 kilometer (km) = 1000 m = 10 3 m 1 centimeter (cm) = 0.01 m = 10-2 m 1 millimeter (mm) = m = 10-3 m 1 nanometer (nm) = m = 10-9 m Good estimates: 1 meter is about 3.3 feet 1 inch is 2.54 centimeters (exact definition!) 5 miles is about 8 kilometers Why unit conversions are important! Units & Conversions Example: How many seconds are in a year? Scientific Notation & Significant Figures How precisely do we know a number? How many significant figures? All non-zero digits are significant Zeros are significant when between other non-zero digits after the decimal point and another significant figure can be clarified by using scientific notation Example: How many days are there in a year? Motion Basics How objects move through space and time Position: location in a coordinate system Displacement: change in position Δx = x f - x i Velocity: rate of change in position v = Δx / Δt Displacement & velocity are vector quantities: include a direction! 4

5 Vector Basics Vectors are drawn as arrows in diagrams A vector quantity is written either in bold or with a small arrow over the top: v or v Ways to express vectors depend on the coordinate system Magnitude and angle: angle measured counterclockwise from x-axis Components: along x- & y-axes SOH CAH TOA: Use it, know it, it is your best friend for decomposing vectors! Figure P1.33, p.16 Example: A person runs northwest at a speed of 2 m/s 1. Define coordinate system and origin 2. Magnitude/angle version 3. Components version A bird flies 3.0 m due west and then 2.0 m due north. What is the magnitude of the bird s displacement? A. 2.0 m B. 3.0 m C. 3.6 m D. 5.0 m E. 6.0 m 5

That s how we roll. Physics : General Physics, Part 1. Agenda. About Me. Administrative Stuff

That s how we roll. Physics : General Physics, Part 1. Agenda. About Me. Administrative Stuff Physics 111-01: General Physics, Part 1 Agenda Today: Syllabus overview, homework registration, administrative stuff Wednesday: Units, sig figs, measurement Reading for Friday: Chapter 1 That s how we