PHY 107 – General Physics 1Venue: NSC 201 on Tu. & Thu. at 2:00 – 3:20 PMInstructor’s Name/Coordinates1Name: Avto Kharchilava (Ph.D. in High Energy Physics)Office: 339 Fronczak HallTelephone: 645-6251E-mail: [email protected] hours: Mon. & Wed. at 2:10 – 3:10 PMSchedule of recitation sessions(starting this week already)Course Instructor/TA Days/time LocationPHY 107 LR-A lec. Dr. A. Kharchilava TuTh @ 2:00-3:20 NSC 201PHY 107 LRA1 John Truong Mon @ 12-12:50 PM O'Brian 212PHY 107 LRA2 Muhammed Simsek Tue @ 8-8:50 AM Norton 216PHY 107 LRA3 John Truong Fri @ 12-12:50 PM Norton 216PHY 107 LRA4John TruongWed @ 12-12:50 PMNorton 2162PHY 107 LRA4John TruongWed @ 12-12:50 PMNorton 216PHY 107 LRA5 Muhammed Simsek Thu @ 8-8:50 AM Norton 216PHY 107 LRA6 John Truong Mon @ 3-3:50 PM Norton 216PHY 107 LRFIF1 Christian Beynis Wed @ 7-7:50 PM Norton 210PHY 107 LRFIF2 Christian Beynis Thu @ 7-7:50 PM Norton 210PHY 107 LRFIFA Muhammed Simsek Fri @ 2-2:50 PM Norton 213Secretary: Christian Beynis <[email protected]>• See UBLearns for TA contact information, office hours, etc.PhysicsClassical (before 1900)(PHY 107, PHY 108)Modern (after 1900)What is PHY 107 About ?3(PHY 207)• In PHY 107 we study classical mechanics that deals with the motion of physical bodies using Newton’s equationsMotivation• Need PHY107 to become a good engineer, scientist, doctor, etc.44•This stuff is interesting !Prerequisites: Check your math skills• The minimum math skills you need for PHY107 are– Algebra, trigonometry, geometry and simple derivatives and integrals• Open the link(s) below in new window and take the Math pretests on algebra and trigonometrySyllabus• Read it carefully  would answer many questions you may have5pretests on algebra and trigonometryhttp://www.algebralab.org/practice/practice.aspx?file=Algebra_MathPretestFormBpart1.xmlhttp://www.algebralab.org/practice/practice.aspx?file=Algebra_MathPretestFormBpart2.xml– Result will indicate if you are prepared for this class• These are just assessments for you, and will not count towards your grade. Contact your advisor if you are scoring below 80%• There is also a math skills assignment on WileyPLUS that will check your calculus knowledgeRecipe for PHY 1071. Study hard (use your score in test 1 as a gauge)2. Come to class3. Do the homework (and more)63. Do the homework (and more)4. Do not stay behind5. If you have questions get them answered6. If you have a problem tell me about itCredit Map for PHY 107Homework: 15%In class quizzes (iclickers): 15%7Higher midterm score: 25 %Lower midterm score: 15 %Final exam score: 30 %Course Home page http://ublearns.buffalo.eduNote: If you cannot access the course webpage send an e-mail with full name and your UB e-mail address to the course secretary so that he can add you to the student listTextbook8Halliday, Resnick, and Walker, Fundamentals of Physics, 10thedition, with WileyPlus and iclicker. See syllabus for various options and details• Available online at WileyPlus• Make use of solutions/hints given in– Student Solutions Manual (SSM), Web (WWW)– Interactive LearningWare (ILW) and Tutoring (GO)Getting Started with WileyPLUS9Getting Started with WileyPLUS10Getting Started with WileyPLUSPHY 107 LR-A http://edugen.wileyplus.com/edugen/class/cls398142/11PHY 107 LR-A http://edugen.wileyplus.com/edugen/class/cls398142/Online Homework• WileyPLUS online homework website at:http://edugen.wileyplus.com/edugen/class/cls398142/12 Make sure you register only once, and in this/your section• The whole textbook is online in WileyPLUS• Homework always due by 11:00 PM on TuesdayHomework Settings1313Few Points to Remember• Reading the textbook is essential, several times, not memorizing– Do not skip check points or sample problems– Ask questions yourself– Maintain regular study schedule•Tips on how to solve problems14•Tips on how to solve problems– “You do not know anything until you have practiced”, R. Feynman– Read problems several times, until you understand what is being asked– Draw diagrams to help visualize the problems• WileyPLUS online homework websitehttp://edugen.wileyplus.com/edugen/class/cls398142/Concepts to be explored in this chapter:1. Measurement of a Physical Variable2.Units and Systems of UnitsChapter 1 Measurement152.Units and Systems of Units3. Basic Units in Mechanics4. Changing Units5. Significant FiguresWhat Is Physics ?• Physics is about the properties of natural objects• Physics is an experimental science• Physics is about measurable quantities, and mathematics is the language of physics16mathematics is the language of physics• In physics we try to find relationships between measured quantities in terms of mathematical equations – Physical Laws• Physical laws can be used to predict the properties of a physical object• The experiment: measuring the electric voltage difference V applied across a conductor and the resulting electric current I that flows through the conductor• If we plot I versus V we get a straight line. This can be expressed in the form: ConstantVR= =An Example of a Physical Law: Ohm’s Law17 ConstantRI= =• Keep in mind: A (empirical) physical law always has its range of validity. Ohm’s law applies for a metal, a semiconductor, and even some non-uniform structures• However, if we examine a diode (two different pieces of semiconductors put together), we get a nonlinear relationship between Vand IWhen Does a Physical Law Apply ?18between Vand I• Example: you step on a scale (to determine your weight) and it reads 120• The number alone is meaningless – it must be accompanied by the units, since, e.g.,120 lb is a different reading then 120 kg !• Conclusion: For every physical parameter we will need the appropriate units, i.e. a standard by which we carry out the Importance of Units19appropriate units, i.e. a standard by which we carry out the measurement•Question: do we have to define units for all parameters ? The answer is: no.• In mechanics we need to define just three parametersLength, Time, and Mass• The three physical parameters: Length, Time, and Mass,are known as base quantities• For the rest of the non-mechanical parameters we need to define only one more unit, that of the electric current• We will emphasize the International System of Units (SI) Base Quantities and Units20• In this system the units for the