Physics 1A: Introduction to Physics and Problem SolvingPowerPoint PresentationSlide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Physics 1A: Introduction to Physics and Problem SolvingInstructor: Dr. Rae RobertsonLectures: MTWThF 8:00 - 9:20 AMCourse LogisticsLectures: MTWTHF 8:00 - 9:20 AM, WLH 2005Problem Sessions: Th 2:00 - 3:20 PM, WLH 2204TA: James Wilson, [email protected] Instructor Office Hours: Th 9:30 - 11:30 AM, MH 2661TA Office Hours: W 2:00 - 4:00 PM, Physics Tutorial Center (Mayer Hall)Course Webpage: http://physics.ucsd.edu/students/courses/summer2008/managed/physics1a/Textbook: College Physics, Vol I, Serway & FaughnGrading: Final: 40%, Quizzes: 60% (20% each), Questions of the Day: 20%, Weekly Homework Sets: UngradedNO makeup quizzes or Final! Know your student code!Lecture Attendance: Mandatory! You can’t learn unless you show up. Please bring 3x5 notecard to each lecture for daily questions.What is Physics??The most incomprehensible thing about the world is that it is comprehensible.-Albert EinsteinObservations, Theories & PredictionsPhysicsTheoryExperimentCareful observations and recording of physical phenomena Systematic variation of conditionsTesting theoretical predictionsFormulation of general descriptions of physical phenomenaPredictions about physical phenomena at all conditionsProblem SolvingUnderstanding HOW physical systems/phenomena work and WHY it behaves as it doesMathematics: The Language of PhysicsThe Book of Nature is written in mathematical characters, without whose help it is impossible to comprehend a single word…..-GalileoDescriptions of physical phenomena = mathematical equationsVariables = physical quantities/characteristics of systemE = mc2EnergyMassSpeed of Light (3*109 m/s)Mathematics: The Language of PhysicsThe Book of Nature is written in mathematical characters, without whose help it is impossible to comprehend a single word…..-GalileoDescriptions of physical phenomena = mathematical equationsVariables = physical quantities/characteristics of systemF = maForceMassAccelerationDimensions and UnitsMany ways to describe an object or systemDimension = physical nature of quantityThree fundamental dimensions can be used to describe many types of phenomena/physical systemsLENGTHSize of an objectDistance between objects or eventsSI UNIT = METERMASSHow much matter is in an objectSI UNIT = KILOGRAMTIMEHow long something lastsSI UNIT = SECONDDimensional AnalysisL*L*L = L3[m] = M[x] = L[t] = TVolume [V] =Velocity [v] = [x]/[t] L/TAcceleration [a] = [v]/[t] (L/T)/T = L/T2Force [F] = [m]*[a] = M*L/T2m3m/sm/s2kg*m/s2 = N Physical QuantityDimensionSI UnitVERY IMPORTANT IN PROBLEM SOLVING!!!Unit ConversionA = 10 m23.28 ftX m1 m = 3.28 ft = 39.37 in1 mile = 1609 m = 1.609 kmWhat is X in meters?What is X in feet?What is the speed limit in SI units?Coordinate Systems++--O++--OCoordinate SystemsCartesian Coordinates Polar CoordinatesPoint in space specified by distancefrom origin in x and y directionsP = (x,y) Point in space specified by straight line distance from origin and angle of line P = (r,)Trigonometry ReviewxyXYrPythagorean Theoremr2 = x2 + y2Sin  =side opposite hypotenuseside adjacent to  hypotenuse side opposite side adjacent to yrxryxCos  =Tan  ====Trig FunctionsSin-1 (y/r) = Cos-1 (x/r) = Tan-1 (y/x) = Inverse Trig FunctionsYOU WILL USE THESE OVER AND OVER AND OVER AND OVER AGAIN!!GET USED TO THEM!!!Problem Solving:10 fool-proof steps1) READ2) READ AGAIN3) DRAW DIAGRAM4) CHOOSE/LABEL COORDINATE SYSTEM5) LABEL PHYSICAL QUANTITIES6) IDENTIFY ALL KNOWN & UNKNOWN QUANTITIES7) CHOOSE EQUATIONS 8) SOLVE EQUATIONS9) INSERT KNOWN QUANTITIES10) CHECK!!Questions of the Day1) If an equation is not dimensionally correct, does that mean that the equation can’t be true?A) YESB) NO2) You walk 10 m in a direction 20o North of East, you want to know how far North you have traveled…What trig function would you use to figure this out?A) Sine B) CosineC)