PHY 211: 002/004/006/008/010 General Physics I Lecturer: Dr. Brad Plaster 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)

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

Why Study Physics ?

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.

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

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

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

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

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.

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.

Course Structure: Recitation Sections Recitation Time Instructor 002 W 9:00 a.m. Mr. Hao Zhang 004 W 10:00 a.m. 006 W 11:00 a.m. Dr. Wolfgang Korsch 008 W 12:00 p.m. Dr. Michael Kovash 010 W 1:00 p.m. Mr. Pratik Dhuvad 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.

Course Structure: Laboratory Sessions Section Laboratory Time Instructor 002 W 9:00 a.m. Mr. Andrew McNamara 004 W 10:00 a.m. Mr. Weihua Zhu 006 W 11:00 a.m. Mr. Jin Xu 008 W 12:00 p.m. Mr. Mathias Boland 010 W 1:00 p.m. Mr. Pratik Dhuvad 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.

Course Structure: Exams Date Points 1 Thurs Sept 23 100 2 Thurs Oct 21 3 Thurs Nov 18 Final Thurs Dec 16 200 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.

Your final letter grade will be no lower than indicated here Grading Policy Homework 100 Recitation Quizzes Laboratory Sessions 200 Exam 1 Exam 2 Exam 3 Final Exam Total 900 A 90.00% – 100.00% B 80.00% – 89.99% C 65.00% – 79.00% D 50.00% – 64.99% E 0% – 49.99% 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.

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

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.

PHY 211

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 Quantity SI Unit Length meter Mass kilogram Time second 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”)

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

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 ?

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

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

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)

Polar Coordinates r θ 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)

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

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

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