Physics 207: Lecture 1, Pg 1Physics 207Physics 207General Physics IGeneral Physics IProf. Peter TimbieProf. Peter TimbieLecture 1Lecture 1Please pick up questionnaire as you come in.Please pick up questionnaire as you come in. Drop it off Drop it off on the back table as you leave.on the back table as you leave.AgendaAgenda CourseCourse organization andorganization and introductionsintroductions Is this the right course for you?Is this the right course for you? What is physics? What is physics? Scope ofScope of this coursethis course Begin chapter 1 Begin chapter 1Homepage:Homepage:www.physics.wisc.edu/undergrads/courses/fall09/207/Physics 207: Lecture 1, Pg 2 TINY MUSHROOMS A crop of silicon nanowires growingunder a transmission electron microscope. The graycolumns are the wires, and the black, liquid droplet on topof each catalyzes the growth. As small at 10 nm in dia. With silicon nanowires, computer scientists seek a basicbuilding block for a new kind of electronics to outpowertoday’s transistors. * First Mention: Transistors, 1948Physics 207: Lecture 1, Pg 3TodayToday’’ss Topics: Topics:Position and Time (Chapter 1)Position and Time (Chapter 1) Position Time Displacement versus time (velocity) Systems of units Dimensional Analysis At 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 sequencesshown below?How can I quantify it?Physics 207: Lecture 1, Pg 5A preliminary stepA preliminary step Predicated on the need to know where and when? Where requires a spatial reference frame and a systemspecifying position (magnitude, direction and units) When requires a temporal reference frame (magnitude,direction and units)time 1 2 3 4 5 6position 1 2 3 4 5 6Physics 207: Lecture 1, Pg 6Different representationsDifferent representationstime 1 2 3 4 5 6position 1 2 3 4 5 6x (meters)t (seconds)26424 60x = t meters/secAlgebraicPictoralGraphicaldisplacement vectorPhysics 207: Lecture 1, Pg 7A slightly more complicated exampleA slightly more complicated exampletime 1 2 3 4 5 6x (meters)t (seconds)26424 60x = x0 + v0 t + at2meters/secAlgebraic (if a is constant)PictoralGraphicaldisplacement vectorPhysics 207: Lecture 1, Pg 8Physics 207: Lecture 1, Pg 9Physics 207: Lecture 1, Pg 10Recap of todayRecap of today’’s lectures lecture So far So 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 course Scope of this course Begin chapter 1 Begin chapter 1 2nd discussion starts this week, same next week Lab starts week of Sept 14 For 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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