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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