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Lect06

# Lect06 - PHYS 172 Modern Mechanics Fall 2009 Lecture 6...

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Fall 2009 PHYS 172: Modern Mechanics Lecture 6 – Fundamental Forces, Reciprocity Read 3.9 – 3.14

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1. The exam will be written as a standard 1 hour exam, but you will have 2 hours to complete it. 2. Absences must be excused in advance, if at all possible, by filing an Absentee Report form in Rm 144 PHYS. (See the syllabus.) For emergencies, contact your instructor by email as soon as possible. 3. Students approved for separate test environments must contact their instructor by email ASAP. 4. You may NOT bring equations sheets, books, etc. It is a closed book exam. A few equations and constants may be provided. DO bring pencils and a calculator (of any standard type). Graphing Calculator is ok. 5. You must show your Purdue Student ID card when turning in your completed exam. Exam 1 - Tuesday September 15, 8:00-10:00 PM Elliott Hall of Music
6. The exam covers all assigned material in this course through the end of Chapter 3, including labs, recitations, and homework. 7. The first exam from last semester can be downloaded from the PHYS 172 web page; click on “Previous Exams”. Exam 1 Announcements, cont:

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CLICKER QUESTION #1 Reading Question (Sections 3.9 – 3.14) (This is a closed-book quiz, no consulting with neighbors, etc.) Choose the correct statement: A. Newton was able to explain where gravity comes from. B. Newton proved that the gravitational force from a uniform sphere is the exactly the same as if it were a point at the center. C. Today’s Global Positioning System (GPS) experimentally proves the complete correctness of Newton’s theory of gravity. D. Newton’s theory of gravity is not quite correct because it leaves out the Heisenberg Uncertainty Principle.
Today’s Lecture • Uniform Circular Motion •The Electric Force and Reciprocity • Predicting Motion When Forces Change

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Uniform Circular Motion: Have one force that pulls towards center causes a change in velocity even though the magnitude of velocity is constant
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Lect06 - PHYS 172 Modern Mechanics Fall 2009 Lecture 6...

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