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PHYSICS 50: Introduction

PHYSICS 50: Introduction. RICHARD CRAIG. Plan for the day. Introductions Me, You Greensheet review Things I assume you already know Vectors review Quiz Enrollment issues. Richard Craig. Education: BA UC Berkeley, MS SJSU , PhD UCLA 1 year teaching at West Valley CC (1979)

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PHYSICS 50: Introduction

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  1. PHYSICS 50: Introduction RICHARD CRAIG

  2. Plan for the day • Introductions • Me, You • Greensheet review • Things I assume you already know • Vectors review • Quiz • Enrollment issues

  3. Richard Craig • Education: • BA UC Berkeley, MS SJSU, PhD UCLA • 1 year teaching at West Valley CC (1979) • 5 years research on semiconductor lasers • 5 years engineering manager in laser start-up company • 12 years VP/CEO of laser companies • Retired 2006 • Came back to teach last spring

  4. Class Emphasis • Concepts as important as solving problems • Test include some conceptual problems • But this is not physics for poets! There will lots of problems to solve • You get little benefit from watching me derive formulas • More examples than derivations • Almost daily quiz • I will try to bring in technical industry examples • Talk a little bit about technology and history of our valley • I will adjust class difficulty based on your feedback • I have never taught this class before!!!

  5. Green Sheet • Do your homework!! • Lots of quizzes • Office hrs: Tu/Th after class, and W after lab

  6. Homework #1 • Read Chapter 1(all), Chapter 2 (not 2.6) • Exercises and Problems:1.3, 1.49, 1.99, 2.14, 2.39, 2.59 • Due next Thursday, 1/31

  7. Class Web Site • Class web site • Go to http://www.sjsu.edu/faculty_and_staff/faculty_pages • Search for Craig • I will post • Power point lectures • Homework assignments • I might post • Homework solutions • Exams and Quizzes • Exam and Quiz solutions

  8. Why my job is difficult in 50 • Your 1st Class in Physics • Some of you (many) want to become engineers or scientists but may not have dedication or skill or both • Physics is the same at DeVry, SJSU, or MIT, you have to learn it • About 20% of you will not get a passing grade in this class

  9. Things I assume you know • Units • We will use MKS units 90% of the time • Length: meters • Time: seconds • Mass: kilogram • Dimensional Analysis • You can only add the same units • How to convert units

  10. Things I assume you know • Exponential Notation • About 6,000,000,000 people on the earth • 6 x 109 people • Units Prefixes • nano (n) • micro () • milli (m) • kilo (k) • mega (M) • giga (G)

  11. Things I Assume you know • Significant figures • What they are • 100, 100.0, 100.0000 • How to use them • Addition, Subtraction, Division, Multiplication • Estimates (order of magnitude) • Example: People density of USA

  12. Things I Assume you know • Simple Trigonometry

  13. Vectors • Scalar: A number • Vector: A number and a direction • Examples • Time • Mass • Velocity • Force

  14. Vectors • Adding Vectors • examples • Components of vectors • Unit vectors • definitions

  15. Vectors have components Vector Addition: Components add like scalars

  16. Units Vectors • Unit vectors i,j,k are magnitude 1 and point in the x,y,z directions respectively

  17. Vector Multiplication 1 Scalar Product or Dot Product

  18. Vector Multiplication 2 Vector Product or Cross Product Magnitude Direction Right hand rule:

  19. Quiz • Work out problem (5 minutes) • Explain pm to another member of class (5 minutes) • It is ok to change your answer after talking • Turn in (electronic in future) • We review

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