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PHY-211 020

PHY-211 020. Summer 2009. What is this?. PHY 211 Section 020 Algebra Based Mechanics What do you mean “mechanics”? Mechanics – the study of things in motion. Linear Motion Angular Motion Forces Energy That sort of thing Think Isaac Newton and apples.

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PHY-211 020

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  1. PHY-211 020 Summer 2009

  2. What is this? • PHY 211 Section 020 • Algebra Based Mechanics • What do you mean “mechanics”? • Mechanics – the study of things in motion. • Linear Motion • Angular Motion • Forces • Energy • That sort of thing • Think Isaac Newton and apples.

  3. Who are you and what have you done with the lecturer? • J. D. Roaden, Physics TA. • http://www.pa.uky.edu/~jroaden/ (still not updated for this semester!) • Office: CP-252 • Email: j.d.roaden@uky.edu –or- jdroad2@uky.edu • Office Hours TBD • Steve Ellis is your lecturer, and you’ll be meeting him soon enough.

  4. When do we meet? Lecture: Monday, Tuesday, and Wednesday from 12:40 pm – 1:40 pm in CP-155 Recitation: Tuesday, Wednesday, Thursday, and Friday from 9:00 am – 10:00 am in this room, CP-367 Lab: Tuesday and Thursday from 1:50 pm – 3:50 pm in CP-165 starting NEXT WEEK. No lab today!

  5. Textbook! Serway/Vuille – Eighth Edition. It looks like this: TurningPoint “Clicker” ResponseCard. It looks like this: Things you’ll need for this course:

  6. Things you’ll need (continued) A lab manual! You can get this one at Johnny Print, which looks like this: Actually, I’m not certain these are ready yet, but when they are, Johnny Print is on S Limestone

  7. Calculator The tests, quizzes, and homeworks for this class assume you have access to a calculator The labs require a TI-83 or TI-84 series calculator (eg. TI-84 plus, TI-83 plus pink shiny edition, etc)

  8. Things you’ll need to do! • Register your clicker: • This is possible at Steve Ellis (your lecturer!)’s website: http://www.pa.uky.edu/~ellis/ • (Hint: Now would be a good time to start writing things down if you haven’t been.) • Read through the syllabi for this course (including lecture/recitation and lab—two separate syllabi!) • You can find them at Steve’s site or on Blackboard.

  9. Webassign! • We’ll be using an online homework system for homework in this course • This is located at http://www.webassign.net (or .com, either works) • You need the following CLASS KEY to register: • uky 6402 7919

  10. Now, skills you’ll need • Physics is not like most classes. • Memorization is not that important • Formula sheets • Physical constants • Problem solving is very important • Learn how to solve problems—not the solution to individual problems • Figuring out what to do is often more difficult than doing it—unless you struggle with the mathematics

  11. Mathematics you’ll need • The more math you can use, the better off you’ll be • Algebra • Solid foundation absolutely required • If you can’t readily: • Solve two equations with two unknowns • Solve quadratic equations • Deal with exponents, cancel factors appropriately, work with negative numbers then you are behind already. Use the next few days to brush up on math. • Trigonometry. You can (re)learn as you go, but you’ll need to know it by the end

  12. What else, math wise? • Geometry • We’ll be working with physical objects—or at least idealized approximations of physical objects • These take the form of shapes—knowing about shapes is good. • Know your Euclidean Geometry

  13. Ideally, where would I be? If you feel confident that, at a moment when you least expect it, somebody could hand you a pen and a math exam (say, college algebra, trig, or geometry) and you could pull a decent grade on it without too much trouble? Math probably won’t be your Achilles Heel in this course.

  14. What, math isn’t enough? • Like I said before—figuring out what to do is often more difficult in this class than doing it. • If you like solving puzzles, you’ll probably like physics • Seeing a problem worked out shows you the sort of math you’ll need to be capable of—but it doesn’t show you the logical leaps necessary to get to the math!

  15. Physics is not a spectator sport! You can read and memorize every problem on the homework and in the solutions manual and still fail If you do not put pen(cil) to paper, you won’t get the problem solving experience you need. It’s not about the final answer, it’s about the journey to get there.

  16. Problem solving method Draw Given Find Physics Solve Check

  17. Vectors • A quantity that gives a magnitude and a direction • Displacement • Velocity • Acceleration • Force • Momentum

  18. Scalars • A quantity that only gives magnitude—not direction • Distance (As opposed to displacement!) • Speed (As opposed to velocity!) • Temperature • Mass • Energy

  19. Vector Diagnostic The following exercise is for completion only—don’t stress if you don’t get it just yet. Vectors are one of the mathematical tools we don’t expect every student to have experience with—the first thing you’ll learn about in this physics course is the math with vectors! We just want to see where you stand right now with vectors.

  20. Vector Diagnostic: +Y +X C = 13.5 m at 30° below -x direction B = 8.5 m at 50° above +x direction A = 10 m in +x direction What is A + C – B?

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