Download - Lect1 Intro 2
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PHY 2053C College Physics AFall 2004
Motion, Forces, Energy, Heat, Waves
Dr. David M . Lind
Dr. Kun Yang
Dr. David Van Wink le
Today:1) Course Organisation and
2) Introduction to Units3) Coordinates on the world
L1intro,Ch1
Course Organisation
Lectures: 101 UPLMonday, Wednesday, Friday 10:10 to 11:00Mini-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 withComputer-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 forlecturing, outline of new course material, andspectacular demonstration experiments
The Friday lecture (usually led by Dr. Yang) is usedfor more examples / working through numericaltechniques / help with homework problems
Mini-Exams every second week for the entire lectureperiod (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 classattendance and student performance.
CAPA homework assignments
There will be a CAPA homework assignment everyweek.
Assignments are available early Tuesday and duebefore a week later on Wednesday 5am firm!
You will log into the CAPA computer system andenter your individual answers to your individualassignment problems.
Login: at http://capa.fsu.edu/
Account: use your acns.garnetacct usernameand password
We generated your CAPA-accounts last Fridaymorning, and everyone should have access toyour accounts now.
v Log onto CAPA before Wednesday and print outat least one problem. We want to make sure youare able to log on properly before your first set isdue!
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Bonus Points
Every Student can add up to 2% to his/her finalcourse average by earning bonus points:
v Questions will be given to the whole class duringeach lecture and you will answer the questions
using the personal response system (PRS)v You will get 2 points for each correct answer or
1 point for each attempt.
v
At the beginning of each week's Monday lecture,you can turn-in a one-page summary of thematerial 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 lecturesv Check the webpage for announcementsv 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 - 5:30pmDr. Lind 10:30am-12:30pmDr. Yang 12:30-2:30pm
v Find a study partnerv Work hard
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What is physics ?(and why do YOU need it ?)
Foundation on which all modern scienceand technology is built it is becoming more andmore important.
Today's medical imaging technology/computers/telecommunication/ is yesterday's physicsresearch.
Teaches a particular way of addressing problems andobserving 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 units1 in = 2.54 cm
= 0.0254 m
= 0.0833 ft
= 1.58 x 10-5 mi
We see five different expressions (using differentunits) for the same length measurement.
Physical expressions are meaningless withoutspecifying the units.
The CAPA-homework system is very strict aboutusing units for your answer!
Unit conversions
In real life you will encounter that more than one unitis used to measure the same thing.e.g. American Unit system Metric SystemConversion mi/hr into km/hr1 mile = 1.609 km
Conversion mi/hr into m/s1 hour = 3600 s, 1 mile = 1609 m
Conversion mi/gallon into km/liters1 gallon=3.8 liters, 1 mi = 1.609 km
70 mph 70mile
hour70
1 mile
hour
1.609km
1 mile112
km
h
70 mph 70mile
hour70
1 mile
1 hour
1609m
1 mile
1 hour
3600 s31.3
m
s
18mi
gallon18
1 mi
1gal
1.609km
1 mi
1 gal
3.8liter7.62
km
liter
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Our units
Physics uses the International Unit SystemSysteme Internationalle (SI),which is a version of the metric system.The standard units:
Property Unit Name SymbolLength Meter 1 mMass Kilogram 1 kgTime Second 1 s
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 often such as
Name Symbol Value Examplemilli m 10-3=1/1000 mm=millimeter
mg=milligrammicro 10-6 s=microsec.nano n 10-9 nm=nanometerkilo k 103=1000 kg=kilogrammega M 106 MegaByte (?)giga G 109 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
The bottom left corner of theUPL 101 projector screen
If we want to describe motion mathematically, wemust choose a frame of reference in which wemeasure the (changing) position of an object byproviding its coordinates.
A typical choice for the zero-point isa point fixed relative to the earth's
surface, e.g.
All of you can now describe yourposition by giving three numbers
in meters: x,y,z
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DISPLACEMENT is the difference between final andoriginal coordinates as defined by your Frame ofReference
Example:
Displacement (Here = 40 m) pos. or neg.Distance is the total length of the path
always positive (Here = 100 m)
Displacement vs Distance
Travel 70 m to the east,then turn aroundand travel 30 m to the west
The stands for change in ...
Stay tuned...
vThis Wednesday: Lecture on Kinem atics
vThis Friday: Recitation/Homework Problems
vBefore Wednesday ...
Read the syllabus
Look at our web-page Log onto CAPAand print
out first problem set
(bring to class Wed.)
Read chapter 2
http://www.physics.fsu.edu/courses/Fall04/phy2053c