PHY 113 A Fall 2013 Lecture 1 1 PHY 113 C General Physics I 11 AM1215 PM TR Olin 101 Plan for Lecture 1 Welcome amp overview Class structure amp announcements Chapter 1 measurement amp units ID: 588352
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PHY 113 C General Physics I
11 AM-12:15 PM TR Olin 101
Plan for Lecture 1:
Welcome
& overview
Class structure & announcements
Chapter 1 – measurement & unitsSlide2
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PHY 113 A General Physics I
11 AM-12:15 PM TR Olin 101
Instructor: Natalie
Holzwarth
(Olin 300)Course Webpage: http://www.wfu.edu/~natalie/f13phy113
Text: Physics for Scientists and Engineers with Modern Physics by Serwey and Jewett, 9th edition*Webpage for Webassign system:http://www.webassign.net/You will also need ani-clicker device for each classA scientific calculator will be needed for homework and exams----------------*May replace with used texts including 8th edition versions.Slide3
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Where to find information about the course on the web
:
http://users.wfu.edu/natalie/f13phy113Slide4
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Comment about Physics ColloquiaSlide6
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Course organization
:
http://users.wfu.edu/natalie/f13phy113/info
/Slide8
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http://
users.wfu.edu/natalie/f13phy113/homework/Slide9
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www.webassign.net
Username =
wfu
email ID (without @wfu.edu)
Institution =
wfuPassword = PHYSICSROCKS (change ASAP)Slide10
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www.webassign.netSlide11
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Problem solving steps
Visualize
problem – labeling variables
Determine which basic physical principle(s) apply
Write down the appropriate equations using the variables defined in step 1.
Check whether you have the correct amount of information to solve the problem (same number of
knowns
and unknowns).
Solve the equations.
Check whether your answer makes sense (units, order of magnitude, etc
.).
L=111
ft
W=63
ft
area = width * length
A = W * L
OKSlide14
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i>clicker exercises:
Which of the following options do you prefer for the number of exams in the course?
3 exams
2 exams
Which of the following options do you prefer for the exam times?
Exams within class time (75 minutes)Exams offered outside of class timeSlide16
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i>clicker
exercise:
Preferences for tutorial times: (Sunday – Thursday)
A. 5:30-7:30 PM B. 6-8 PM
C. 7-9 PM D. 8-10 PM E. OtherSlide17
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PHY 113 Labs will start Monday Sept. 3
rd
and run through the week of Nov. 16
th
. There will be no labs during Thanksgiving week.
PHY 113 Tutorial sessions will also start next week.Slide18
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General advice on how to learn physics:
Physics is built on basic principles (“laws”) from which all results can be derived (deduced)
Focus your attention on
understanding
the basic principles
Practice using these basic principles to solve problemsMemorization is of little use in the study and practice of physicsNote: In general, the best way to learn physics is to practice problem solving. One benefit of learning physics is the development of general problem solving skills. Note that memorization of the text and lecture material is rarely useful.As you are working problems, you may wish to construct a sheet of paper containing the basic equations you use. This basic equation sheet (8.5 in x 11 in) can be used during exams.Slide19
Advice:
Keep basic concepts and equations at the top of your head.
Practice problem solving and math skills
Develop an equation sheet that you can consult.
Equation Sheet
Problem solving skills
Math skills
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Problem solving steps
Visualize problem – labeling variables
Determine which basic physical principle(s) apply
Write down the appropriate equations using the variables defined in step 1.
Check whether you have the correct amount of information to solve the problem (same number of
knowns
and unknowns).
Solve the equations.Check whether your answer makes sense (units, order of magnitude, etc.).
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y (m)
x (m)
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The
Zeroth
Law of Physics
All physical phenomena can be analyzed using fundamental “laws” which are stated in terms of basic concepts and represented in terms of mathematical expressions and equations.
Slide22
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i>clicker exercise:
Why would a physicist (or anyone else) want to know that the ball follows a parabolic trajectory?
Because it tests the basic principles of physics.
Because it can help a golfer get a hole in one.
Because it shows that gravity is effecting the motion of the ball.
Because it shows a contrast with straight line motion.Because it makes you look smart.Slide23
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The
Zeroth
Law of Physics
All physical phenomena can be analyzed using fundamental “laws” which are stated in terms of basic concepts and represented in terms of mathematical expressions and equations.
In order to perform the analysis, it is necessary to have standard units to measure the quantities of interest – time, distance, mass, etc.Slide24
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Measurement units
Standard units “SI” (by international agreement in 1960)
length – meter
mass -- kilogram
time -- second Slide25
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http://www.nist.gov/pml/wmd/metric/length.cfmSlide26
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http://www.nist.gov/pml/wmd/metric/mass.cfmSlide27
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http://www.nist.gov/pml/wmd/metric/time.cfmSlide28
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Terrible example
:
10
12
bullSlide31
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Comments about errors in measurement
Slide32
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Comments about errors in measurement -- continued
i>clicker exercise:
What should we do about this?
Leave it as is?
Expand the expression?
Run away screaming?Slide33
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Comments about errors in measurement -- continued
Slide34
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Comments about errors in measurement -- continuedSlide35
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Comment on significant figures
In my opinion the notion of significant figures is more trouble than it is worth and is given more ink (pixels) than it deserves.
If you are performing a calculation,
NEVER round your answer except possibly after the last step.Slide36
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Reminders
Contact me (Olin 300, x5510,
natalie@wfu.edu
) with any questions, concerns, etc.
Before next class: skim Chapter 1 and read Chapter 2 of textbook;
Email natalie@wfu.edu with a question concerning one-dimensional motionTry practice problems in webassign.net (Assignment 1)Bring i>clickers to class