Physics 207 General Physics I Prof. Peter Timbie Lecture 1PowerPoint PresentationToday’s Topics:Position and TimeA preliminary stepDifferent representationsA slightly more complicated exampleSlide 8Slide 9Recap of today’s lecturePhysics 207: Lecture 1, Pg 1Physics 207Physics 207General Physics IGeneral Physics IProf. Peter Timbie Prof. Peter Timbie Lecture 1Lecture 1Please pick up questionnaire as you come in.Please pick up questionnaire as you come in. Drop it off on the back table as you leave.Drop it off on the back table as you leave.AgendaAgenda Course organization and introductionsCourse organization and introductions Is this the right course for you?Is this the right course for you? What is physics?What is physics? Scope of this courseScope of this course Begin chapter 1Begin chapter 1Homepage: Homepage: www.physics.wisc.edu/undergrads/courses/fall09/207/Physics 207: Lecture 1, Pg 2TINY MUSHROOMS A crop of silicon nanowires growing under a transmission electron microscope. The gray columns are the wires, and the black, liquid droplet on top of each catalyzes the growth. As small at 10 nm in dia.With silicon nanowires, computer scientists seek a basic building block for a new kind of electronics to outpower today’s transistors. * First Mention: Transistors, 1948Physics 207: Lecture 1, Pg 3Today’s Topics:Today’s Topics:Position and Time (Chapter 1)Position and Time (Chapter 1)PositionTimeDisplacement versus time (velocity)Systems of unitsDimensional AnalysisAt right is the world’s smallestbiped: A single molecule of kinesin, walks along a cellular microtubule fiber, pulling along behind it a vesicle of nutrientsPhysics 207: Lecture 1, Pg 4Position and TimePosition and TimeAn example below:An example below: Question: What is happening in the two time elapse sequences shown below? How can I quantify it?Physics 207: Lecture 1, Pg 5A preliminary stepA preliminary stepPredicated on the need to know where and when?Where requires a spatial reference frame and a system specifying position (magnitude, direction and units)When requires a temporal reference frame (magnitude, direction and units)time 1 2 3 4 5 6 position 1 2 3 4 5 6Physics 207: Lecture 1, Pg 6Different representationsDifferent representationstime 1 2 3 4 5 6 position 1 2 3 4 5 6 x (meters)t (seconds)26424 60x = t meters/sec AlgebraicPictoralGraphicaldisplacement vectorPhysics 207: Lecture 1, Pg 7A slightly more complicated example A slightly more complicated example time 1 2 3 4 5 6 x (meters)t (seconds)26424 60x = x0 + v0 t + at2 meters/sec Algebraic (if a is constant)PictoralGraphicaldisplacement vectorPhysics 207: Lecture 1, Pg 8Physics 207: Lecture 1, Pg 9Physics 207: Lecture 1, Pg 10Recap of today’s lectureRecap of today’s lecture So farSo far Course organization and introductionsCourse organization and introductions Is this the right course for you?Is this the right course for you? What is physics?What is physics? Scope of this courseScope of this course Begin chapter 1Begin chapter 12nd discussion starts this week, same next weekLab starts week of Sept 14For next week» read Chapters 1 & 2» start using Mastering Physics (!!!)»HW 1 (intro to MP) is due Friday 6 PM»HW 2 will be due Thurs, Sept 10, 6
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