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PHY 211: 002/004/006/008/010

General Physics I. Lecturer : Dr. Brad Plaster. PHY 211: 002/004/006/008/010. Assistant Professor of Physics. b rad.plaster@uky.edu. Office: 281 Chemistry-Physics Building. Office Tel: 257-3960. Office Hours :. Tuesdays , 2:00 p.m. – 4 :00 p.m.

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PHY 211: 002/004/006/008/010

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  1. General Physics I Lecturer: Dr. Brad Plaster PHY 211: 002/004/006/008/010 Assistant Professor of Physics brad.plaster@uky.edu Office: 281 Chemistry-Physics Building Office Tel: 257-3960 Office Hours: Tuesdays, 2:00 p.m. – 4:00 p.m. Wednesdays, 1:00 p.m. – 2:00 p.m. and by appointment (send email)

  2. Why Study Physics ? • Physics principles underlie many facets of modern life as we know it !

  3. Why Study Physics ?

  4. What is PHY 211 ? • Goal of PHY 211: Deepen your understanding of physics + Develop your analytical-thinking, problem-solving, and quantitative-reasoning skills  MCAT success !! • PHY 211 will focus on the branch of physics known as mechanics: Study of the physical laws of motion. Galileo, Newton, Einstein, … • Mathematics is the language of physics. Will use algebra and trigonometry frequently throughout this course.

  5. What is PHY 211 ? • Course divided roughly into 4 topical areas • Topic 1: Basics of Mechanics • Velocity, Acceleration, Gravity, Newton’s Laws of Motion

  6. What is PHY 211 ? • Course divided roughly into 4 topical areas • Topic 2: Energy, Momentum, Centripetal Acceleration • Kinetic and Potential Energy, Power, Collisions, • Rocket Propulsion, Gravitation, Planetary Motion

  7. What is PHY 211 ? • Course divided roughly into 4 topical areas • Topic 3: Rotational Motion • Torque, Moments of Inertia, Angular Acceleration, • Angular Momentum Figure Skater: (3:40 – 3:55) http://www.youtube.com/watch?v=J6aSOpy2Z9g

  8. What is PHY 211 ? • Course divided roughly into 4 topical areas • Topic 4: Buoyancy, Fluid Motion, Simple Harmonic Motion, Waves

  9. Course Structure: Lectures • Lectures: TR, 11:00 a.m. – 12:15 p.m. Discuss and expound upon material in the textbook. • Textbook College Physics (Eighth Edition) Serway/Vuille/Faughn • Webpage: Blackboard http://elearning.uky.edu Syllabus with complete Course Schedule posted there. View your grades.

  10. Course Structure: Homework • Ten (10) homework assignments (see Course Schedule). 15 – 25 problems on each HW assignment. WebAssign: Register ASAP !! (First HW due Sept 1) https://www.webassign.net/student.html Class Key: uky 6135 8279 10 attempts at each individual problem. Numerical tolerance of ±2%. Due at 11:00 p.m. on indicated dates. Late homework will NOT be accepted.

  11. Course Structure: Recitation Sections • Develop your problem-solving skills. Bring questions on the HW !! (more useful if start HW before class) • Short quiz (5–10 minutes) given at beginning of recitation on dates indicated (11 total). May be similar to part(s) of a current HW problem. No make-up quizzes.

  12. Course Structure: Laboratory Sessions • Administered independently of the lectures and recitations. Information sheet posted on Blackboard. Please read ASAP (info on lab manual, calculators, etc.). • Labs start the week of September 13th.

  13. Course Structure: Exams • All exams will be closed-book/closed-note. • Formula sheet will be provided (posted in advance). • Will be allowed to use a scientific calculator. • Final exam will be comprehensive.

  14. Grading Policy Your final letter grade will be no lower than indicated here Each recitation quiz will be 10 points. 11 quizzes  Can earn “bonus points”. Thus, no make-up quizzes.

  15. Other Items • Course Evaluation: You get to evaluate me ! Details in syllabus, also reminder later in semester 5 point bonus to final grade for completing evaluation • Classroom and Learning Accommodations Disability Resource Center, 7-2754, Room 2 Alumni Gym • Academic Honesty Cheating on exams will absolutely not be tolerated • Please silence your cell phones/PDAs during lectures

  16. Need Help ? • If you are having difficulties, don’t wait to ask for help until it’s too late ! • Office hours: Lecturer, Recitation/Lab Instructors • Can attend any of these office hours (posted on Bb) • Physics Resource Room (staffed M-F, 9-5) Room 310J of the M.I. King Science Library Graduate students in physics paid to assist all walk-in students with physics questions • Department maintains list of private tutors. See syllabus for webpage link.

  17. PHY 211

  18. SI Units: Length, Mass, Time • Laws of physics involve physical quantities such as Forces, Velocity, Acceleration, Momentum, Energy, Volume, … • In mechanics, all of these can be described in terms of the more fundamental quantities: Length Mass Time • Standard system of units for these fundamental quantities: SI: Système International Distance traveled by light in 1/299792458 second Mass of a specific platinum-iridium alloy cylinder in France 9.1926317  109 times the period of oscillation of radiation emitted from Cesium atom (“atomic clock”)

  19. Dimensional Analysis • Physics: “Dimension” denotes the physical nature of a quantity. Example: Distance (length) between UK and the U. of Louisville can be measured in miles, kilometers, feet, etc. • Use symbols L, M, and T to denote dimensions of length, mass, and time. • Use brackets […] to denote the dimensions of a physical quantity. • Examples of variables with dimensions: • Time t: [t] = T • Length x: [x] = L • Velocity v: [v] = L / T • Acceleration a: [a] = L / T2

  20. Dimensional Analysis • Dimensions can be treated as algebraic quantities. • Useful for checking whether or not your answer makes sense ! • Suppose you derived an equation on an exam: • v = at2 • Can this be correct ?

  21. Conversion of Units • Sometimes it is necessary to convert from one system of units to a different system of units. [Example: Driving in Europe, kph !] • Extensive list of conversion factors in front cover of textbook. • Units can be treated as algebraic quantities that cancel each other. • Example: Driving in Germany on the Autobahn at speed of 50 m/s. How fast are you going in mph? • Front Cover • 1 m = 3.281 ft 1 mile = 5280 ft 1 h = 3600 s

  22. Coordinate Systems • Many aspects of physics deal with locations/positions in space. This requires the definition of a coordinate system which is used to specify locations in space. • A coordinate system must consist of the following: • Fixed reference point “O” (the origin) • Set of specified axes (or directions), with scale and labels on the axes • Instructions on labeling a point in space relative to the origin and axes

  23. Cartesian (Rectangular)Coordinate System y (m) An arbitrary point is labeled with its coordinates (x,y) (x,y) (−3, 4) origin O = (0,0) x (m) (−6, −2 ) (2,−2)

  24. Polar Coordinates Points located in space by coordinates (r, θ) r : distance from origin, O θ : angle between a reference line and a line drawn from O to the point y r r > 0 : always ! θ θ > 0 : counter-clockwise from x-axis x θ < 0 : clockwise from x-axis reference line (positive x-axis)

  25. Review of Trigonometry (opp) (adj) y (hyp) (hyp) (opp) (adj) r y θ x Pythagorean Theorem ! x

  26. Example: Problem 1.41 (a) Length of unknown side? θ 6.00 m (b) tan of θ = ? 9.00 m φ (c) sin of φ = ?

  27. Reading Assignment • For today’s class: 1.1 – 1.9 • Next class: 2.1 – 2.4

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