Lect1 Intro 2

PHY 2053C – College Physics A

L1—intro,Ch1

Fall 2004

Motion, Forces, Energy, Heat, Waves Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle

Today: 1) Course Organisation and 2) Introduction to Units 3) Coordinates on the world

Course Organisation Lectures: 101 UPL Monday, Wednesday, Friday 10:10 to 11:00 Mini-Exams every second week on Wednesdays (see schedule on syllabus) Laboratory: One session in 107 or 109 UPL Office hours: homework help, tutorials: 211 UPL Tuesday 9:30 - 10:30am (Van Winkle) 10:30am-12:30pm (Lind) 12:30-2:30pm (Yang) 4:30 - 5:30pm (Van Winkle) Homework assignments: LON-CAPA: Learning on-line with Computer-Aided-Personal-Approach Course website: syllabus http://www.physics.fsu.edu/courses/Fall04/phy2053c/

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The Lectures The Monday and Wednesday lectures are used for “lecturing”, outline of new course material, and spectacular demonstration experiments The Friday lecture (usually led by Dr. Yang) is used for more examples / working through numerical techniques / help with homework problems Mini-Exams every second week for the entire lecture period (see schedule on syllabus) The Mini-Exam problems are very similar to the examples discussed on Friday. Note that there is a strong correlation between class attendance and student performance.

CAPA homework assignments There will be a CAPA homework assignment every week. Assignments are available early Tuesday and due before a week later on Wednesday 5am firm! You will log into the CAPA computer system and enter your individual answers to your individual assignment problems. Login: at http://capa.fsu.edu/ Account: use your acns.garnet acct username and password We generated your CAPA-accounts last Friday morning, and everyone should have access to your accounts now. v Log onto CAPA before Wednesday and print out at least one problem. We want to make sure you are able to log on properly before your first set is due!

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Class Meetings: Labs 9 different sections / UPL 107 or 109, depending on which section you are registered for! Hands-on experience with equipments Analyzing scientific data: graphing and spreadsheet techniques Reinforcing the topics / concepts of the lecture Lab-manual available on-line from the course webpage Print out a copy of the manual and read it before coming to each lab! The lab is a required component of this course! You must complete every lab (12/12) to pass this course!

Grading of the course In order to pass this course, you must: Complete every lab satisfactorily Attempt all seven bi-weekly mini-exams Attempt the final exam Your Grade is calculated based on 1.) seven mini-exams 50% 2.) labs 15% 3.) CAPA homework 15% 4.) Final Exam 20% Letter grade: See table in Syllabus

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Bonus Points Every Student can add up to 2% to his/her final course average by earning bonus points: v

v

v

Questions will be given to the whole class during each lecture and you will answer the questions using the “personal response system” (PRS) You will get 2 points for each correct answer or 1 point for each attempt. At the beginning of each week's Monday lecture, you can turn-in a one-page summary of the material to be covered that week. -> 3 points

Where and how to get help Many students think, physics is hard. It is, if you don't let us help you! v Attend all lectures v Check the webpage for announcements v Come to professor's office hours / homework help sessions / tutorials: (all held on Tuesday in 211UPL) Dr. Van Winkle 9:30 - 10:30am, 4:30 - 5:30pm Dr. Lind 10:30am-12:30pm Dr. Yang 12:30-2:30pm v Find a study partner v Work hard

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What is physics ? (and why do YOU need it ?) Foundation on which all modern science and technology is built – it is becoming more and more important. Today's medical imaging technology/computers / telecommunication / is yesterday's physics research. Teaches a particular way of addressing problems and observing the environment. Helps you understand what is possible and what is not, which information to believe and which not.

Question 1 Why are you here ? 1) I love physics. 2) Understanding Physics helps me understand my major subject better. 3) It is a required course for me. 4) All of the above. 5) What ? This is Physics ? I was looking for Freshman English Composition !

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Units Physics measurements require units 1 in = 2.54 cm = 0.0254 m = 0.0833 ft = 1.58 x 10-5 mi We see five different expressions (using different units) for the same length measurement. Physical expressions are meaningless without specifying the units. The CAPA-homework system is very strict about using units for your answer!

Unit conversions In real life you will encounter that more than one unit is used to measure the same thing. e.g. American Unit system <=> Metric System Conversion mi/hr into km/hr 1 mile = 1.609 km

70 mph 70

mile hour

70

1 mile hour

1.609 km km 112 1 mile h

Conversion mi/hr into m/s 1 hour = 3600 s, 1 mile = 1609 m

70 mph 70

mile hour

70

1 mile 1 hour

1609 m 1 mile

1 hour 3600 s

31.3

m s

Conversion mi/gallon into km/liters 1 gallon=3.8 liters, 1 mi = 1.609 km

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mi gallon

18

1 mi 1 gal

1.609 km 1 mi

1 gal 3.8 liter

7.62

km liter

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Our units Physics uses the “International Unit System” Systeme Internationalle (SI), which is a version of the metric system. The “standard units:” Property Length Mass Time

Unit Name Meter Kilogram Second

Symbol 1m 1 kg 1s

Essentially All other units are derived from these three! Homework Problems: Always convert first to standard units

Modification of Units For some problems, the standard units are unconvenient. They can be modified by “prefixes” to show powers of ten such as Name milli

Symbol Value m 10-3=1/1000

micro nano kilo mega giga

µ n k M G

10-6 10-9 103=1000 106 109

Example mm=millimeter mg=milligram µs=microsec. nm=nanometer kg=kilogram MegaByte (?) Gigawatt

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Kinematics We will start with the subject of Kinematics:

“How do we describe the motion of objects?” a) In one and two dimensions . b) As a function of time. c) with constant acceleration (free fall) The next subject (next week) will be Dynamics: “What causes the change in motion of objects?”

Frame of Reference If we want to describe motion mathematically, we must choose a frame of reference in which we measure the (changing) position of an object by providing its coordinates. A typical choice for the zero-point is a point fixed relative to the earth's surface, e.g.

The bottom left corner of the UPL 101 projector screen All of you can now describe your position by giving three numbers in meters: x,y,z

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Displacement vs Distance DISPLACEMENT is the difference between final and original coordinates as defined by your Frame of Reference The ∆ stands for “change in ...”

Example: “Travel 70 m to the east, then turn around and travel 30 m to the west”

Displacement (Here = 40 m) pos. or neg. Distance is the total length of the path always positive (Here = 100 m)

Stay tuned... vThis Wednesday: Lecture on Kinematics vThis Friday: Recitation/Homework Problems vBefore Wednesday ... – Read the syllabus – Look at our web-page – Log onto CAPA and print out first problem set (bring to class Wed.) – Read chapter 2

http://www.physics.fsu.edu/courses/Fall04/phy2053c

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