Lecture 1 Purdue University, Physics 220 1 ?? Kinematics ?? Forces ?? Energy and Momentum ?? Rotations ?? Fluids ?? Oscillations/Waves/Sound ?? Thermodynamics Welcome to PHYSICS 220 (Section 1) Prof. Wei K. Cui Lecture 1 Purdue University, Physics 220 2 Class Format ?? Lecture Sections: ?? Instructors: Profs Wei Cui and Yulia Pushkar ?? Recitation Section 1: ?? Instructor: Mr. Deepak Pandey ?? CHIP coordinator: Dr. V.K. Saxena ?? Laboratory: ?? Coordinator: Dr. A. Lewicki ?? Lab Room: PHYS 121 Lecture 1 Purdue University, Physics 220 3 Course Web Site ?? Course Syllabus ?? Policies ?? Grading scheme ?? Exams & iClicker exercises ?? Lab Syllabus ?? Tentative Class Calendar ?? Pre-lecture reading assignments ?? Homework due dates ?? CHIP User?s Guide ?? Homework ?? Grades http://www.physics.purdue.edu/phys220 Lecture 1 Purdue University, Physics 220 4 Textbook The textbook is College Physics, Vol I, by Nicholas J. Giordano (Brooks/Cole). We will cover almost all of the topics in this volume, at a rate of one chapter per week! Very Fast! Come prepared! Lecture 1 Purdue University, Physics 220 5 Tips ?? Pre-lecture reading ?? Come to the lectures prepared! ?? Things to pay attention to ?? Concepts, connections, motivation: Lecture ?? Problem solving: Recitation + Homework ?? Hands-on lab ?? Taking notes ?? Lecture notes can be downloaded from the course web site ?? But they are sketchy ? you need to fill in details in class ?? Post-lecture reading ?? See if there are still things you do not understand ?? Seeking help ?? See us during office hours! ?? Physics Help Center Lecture 1 Purdue University, Physics 220 6 Homework ?? We will use CHIP (Computerized Homework In Physics) for homework assignments ?? The homework is due by 10 am on Fridays ?? Homework is computer graded ?? 100% if completed before the deadline ?? 75% if completed within three days of the deadline ?? 50% if completed after three days but within one week of the deadline ?? 0% after one week past the deadline ?? There is a limit on the number of attempts allowed. Lecture 1 Purdue University, Physics 220 7 iClicker ?? We will use iClicker for interactive lecture and recitation exercises ?? One point for participating in each exercise ?? Two points for each correct answer ?? iClicker can be purchased at Purdue bookstores ?? Registration: ?? You must register your iClicker on CHIP! ?? Use serial number at the back of your iClicker ?? Go to CHIP -> Student Gradebook ?? DO NOT register on the iClicker web site! ?? Deadline: by the end of this week ?? We will start to use iClicker next week! Lecture 1 Purdue University, Physics 220 8 Exams and Grades ?? Exams: ?? There will be two midterm exams and one final exam. All exams are closed-book. The final exam will be cumulative. ?? Exam 1: Feb 22, 2010, 6:30 ? 7:30 PM ?? Exam 2: Mar 29, 2010, 6:30 ? 7:30 PM ?? Final: TBA (2 hours) ?? Grades: ?? The final grade will be determined on the following basis: ?? 300 points final exam ?? 300 points two evening exams (150 points each) ?? 150 points laboratory ?? 100 points CHIP homework ?? 50 points recitation exercises ?? 100 points lecture exercises ?? No excused iClicker exercises. ?? You must pass the lab in order to pass the course. Lecture 1 Purdue University, Physics 220 9 About Me An astrophysicist who loses sleep over black holes Want to learn more? Visit http://www.physics.purdue.edu/~cui Lecture 1 Purdue University, Physics 220 10 Units ?? To communicate the result of a measurement for a quantity, a unit must be defined! ?? Defining units allows everyone to relate to the same fundamental amount. ?? Always write down units and carry the units through all of the calculations. ?? We use the SI system ?? Length: meter (m) ?? Mass: kilogram (kg) ?? Time: second (s) ?? Dimensional Analysis: ?? Both sides of an equation must have the same units. ?? Can be used to verify equations, answers. 1 meter = 3.281 ft 1 kg = 2.205 pounds Significant Figures ?? There is an uncertainty associated with all measurements ?? Uncertainty is also called experimental error ?? Values are written using significant figures ?? A digit is significant if it is meaningful with regard to the accuracy of the value ?? Zeros may be ambiguous ?? Scientific notation helps clarify the significance of any zeros Lecture 1 Purdue University, Physics 220 12 Significant Figures: Examples Prefix (abbreviation) Power of Ten Peta (P) 10 15 Tera (T) 10 12 Giga (G) 10 9 Mega (M) 10 6 Kilo (k) 10 3 Hecto (h) 10 2 Deci (d) 10 -1 Centi (c) 10 -2 Milli (m) 10 -3 Micro (µ) 10 -6 Nano (n) 10 -9 Pico (p) 10 -12 Femto (f) 10 -15 Your height is: (A) 5.9 ft (B) 5.90 ft B is more accurate than A, as its result contains more significant figures. The approved financial bailout: $700,000,000,000 What about $7.0010 x 10 11 ? or $7 x 10 11 Lecture 1 Purdue University, Physics 220 13 Significant Figures - cont?d What is the perimeter of a circle of radius 1.2 m? What about: 3.1415 + 0.1 = 3.2415 or 0.1415 - 0.02 = 0.1215? Ans: 3.2 or 0.12 L = 2?r = 2 x 3.1415926 ? x 1.2 = 7.539822 ?m L = 7.5 m Angle Measurements ?? Various units ?? Degrees ?? Radians ?? 360° = 2 ? rad ?? Definition of radian ?? ? = s/ r ?? s is the length of arc ?? r is the radius ?? s and r must be measured in the same units Lecture 1 Purdue University, Physics 220 15 Trigonometry Lecture 1 Purdue University, Physics 220 16 Vector Lecture 1 Purdue University, Physics 220 17 Vector and Coordinate System Vector from Components ?? If you know the components, you can find the vector ?? Use the Pythagorean Theorem for the magnitude : ?? Use the tan -1 to find the direction: Wei Cui Lecture01.ppt