Transcript Welcome to Physics 7C - University of California, Davis

Welcome to Physics 7C
Emily West
[email protected]
Agenda
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Logistics: Syllabus & Web Page
Clicker Setup
Course Overview--the big ideas
Simple Harmonic Oscillation Review
Wave Introduction
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What is Total Phase and why do we care?
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Some Logistics
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Course Webpage:
http://physics.ucdavis.edu/physics7
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Physics 7C Fall 2008, Sections A & B Syllabus
Welcome Back to Physics 7!
This course is deliberately taught in a way to m ake it m ore consistent wi thwhat current research reveals about
how students actually learn subj ectslike science. The lecture is not designed to function as the means by
whi ch you acquire the course content. Rather, it is to be used to provide focus and to provide afram ework for
your discussion/lab (DL) experience and the time you spend outside of class. M uch of your learning wil l occur
as you participate in various types of activiti es,experiments, and discussi ons in sm all groups and as a whole
class in DL, and as you carry out the homework assignments between each DL meeting.
Lectures
Lecturesare on Tuesdays in Roessler 66. Lecture A is 7:30-8:50am . LectureB is 9-10:20am .
There will be seven qui zzes, one during each lecture except the fi rst on Sept
ember 30 and the week of
Thanksgiving break.
Instructors
Em ily West
[email protected]
Office hours: Monday 1 PM – 2 PM , TB114
Dr. Wendell Potter
[email protected]
Office Hours: T hursday 3:40–4:30 158 Roessl er
Email
When using e-mai l, please include “Physics7 C” in the subject line. Be sure to include your return emai l
address (and your name) in the body of your message, as it often does not show up in the em ail header. We
woul d preferreply ing to your officialUC Davis emai l address.
Discussion/Labs
There are eleven differ
ent DL sections for 7C, sections A & B. Each DL meeting lasts two hours and 20
minutes and meets twice each week in TB114 (across from Haring Hall). If you m ust m iss a ,DL, you might be
able to make it up, if there is another section still doi ng the same activities. You may attend another DL with the
permissi on of the Instructor. T ake a note signed by the Instructor back to your own DL Instructor at the
following DL meeting. You maymake-up no more thanthree DL meetings.
NOT E: The lab fee for Physics 7C is $21.00 to cover the cost of material s. If you cannotpay this fee, you
may be eligibl e for a fee wai ver. Contact the Physics Office,225 Phys/Geo, before the 20th day of instructi on.
Studentswho are Pel l Grant Eligibl e autom atic al ly receivea fee wai ver.
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Learning resources
Course Text: “Physics 7C, Course Notes.” The text is avai a
l ble on the webpage as a PDF fil e.
Web page (http://physics.ucdav is.edu/physics7): The Physics 7C web page has som e additi onal course
material . Updates and announcements will be posted there.
Handouts: You will receive several handouts at each DL meeting.
Lecture Presentations: Periodicall y,additional material will be posted on the webpage.
Your Personal Learning Resource: You are responsible for organizing your notes, written materials from DL,
text, labworkbook, etc., in a way that is effectivefor you.
Course expectations and grading: The responsibility for learning is yours!
Your course grade in Physics 7C is based primarily on your performance on the qui zzes and on the final exam .
Extraordinary participation in DL or lack of participationcan also affect your grade, as can in-lecture clicker
questions. The lowest quiz score willbe dropped in determining your quiz grade. You will al so receive
autom aticcredi t for up to 15% of the clicker questions, whic h shoul d be enough to account for any
technologic al di fficulties. Your grade is determined by whichever method benefitsyou m ore:
50% Avg ofQuizzes + 45% Final exam + 5% Clicker score ± DL Grade
20% Avg of Quiz zes + 75% Final exam + 5% Clicker score ± DL Grade
Exams:
There will be seven quizzesand a final exam . Each quiz is given during lecture, and the final
exam occurs during the UCD assigned slot—in this case, Wednesday December 10th, 3:30-5:30pm . T ests are
closed book and closed notes, though key equations from the material willbe availabl e on the exams.
Calcul ators are al lo wed for tests unl ess advertised otherwise in advance.
Grading: The test questions will begraded by assi gning a lettercode that characterizesyour response.
These codes will be translated to a poi nt value that will contributeto your final grade. A description of the
meaning of the codes will be posted on the website. If, after carefullycomparing what you actually wrote on
your test question and the description of the codes, you believethe wrong code was assi gned, you may
request a reconsiderationof the code assigned to a particular response. T o do this, attach to your test the test
re-grade form (available from the website). Submit these to Em ily Westduring the lecture within one week
after the return of the tests.
(Warning: Do not al teryour test in any way when subm itting for a regrade. Altered qui zzes will be turned over
to Student Judic
ial Affairs – No exceptions.) Note: T ests subm ittedfor regrade are regraded in thei r entirety,
whi ch can result in decreased sc ores.
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Quizzes: T here will
beseven quizzes, each given sometim e during the lecture, each roughl y 20 minutes
long. T here will beno make-up quizzes.
Final Exam:
The finalexam is on Wednesd ay, December 10th, 3:30pm-5:30pm . You must take the final
exam at this tim e and day. If you cannot take the
final atthis time, do not take Physics 7C this sess ion. The
only exceptionis if taking the final at this tim e conflicts with observance of your religious practi ce – If this is the
case, contactEmily West during the first week of class.
Clickers:
During lecture, I will periodic al ly ask m ultipl e choi ce clicker questions to quickl ygauge your
underst anding of the material. Clicker questions are worth 5% of your grade. Participation guarantees you full
credit —please answer thoughtful lyand withyour honest bel iefsso the class can best meet each student’s
needs.
Discussion/Laboratory grading:
The DL is central to the course. If you fail DL, you will fail
Physics 7C. Your DL Instructor will determine your DL grade based on your preparation (consistency in
compl eting the out-of-class assignments) and participation in the DL. Your T A will further di scuss how
this grade is determined. DL grades are:
HP: High pass – increases your course grade by 0.333 poi nts (on the Registrar’s standard 4-point scal e).
However, a high passwill not rai se an "A" to an "A+." Participation st ands out as truly exceptional in DL.
M P: Mid pass – increases your course grade by 0.167 points. Participation exceeds what is expected.
P: Pass – does not change your course grade. Does everything that is expected of students in DL. A good
soli d record of participation.
LP: Low pass – decreases your course grade by 0.333 poi nts. Does not m eetparticipation expectations.
U: Unsatisfactory– decreases your course grade by 1.000 points (i.e., a whol e lettergrade: "B-" to "C-", or "B"
to "C", etc.).Lack of participation is signi ficant and affects the learning of other students.
F: Fail h
t e course (regardl ess of test and final scores). Level of participation in DL is totallyunacceptable.
Note: the m ajority of students receiv e a Pass grade in DL
Attendance in DL is mandatory. With two DL absences, your highest DL grade is a Low Pass. With three
DL absences, your highest DL grade is Unsatisfactory. Four or more DL absences is totally unacceptableand
you will fail Physics 7C. Low Passes and Unsatisfactory grades will also be given for chroni c tardiness, leaving
early, lack of activeparticipation, incomplete hom ework, and behavior that contributes negativelyto the
productivefunctioning of the sm all groups.
Academic dishonesty: Cheating w ill not be tolerated. Cheating of any form is always immedi atel y
reported to Student Judi cial Affairs for appropriate action. Weappreciate any suggestions you m ay have to
help us reduce the temptations and opportuni ties ofacademic dishonesty.
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Clicker Setup: Joining Class
1) Turn on your clicker; It scans for Classes
2) If it doesn’t scan automatically, hit enter
(green button)
3) Find FAPHY7C1; hit enter
4) Display reads “ANS: FAPHY7C1;” hit enter
5) When you’ve successfully joined, display
reads “ANS: wait for Q”
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PRS Clicker Setup: Student ID
1)
2)
3)
4)
Turn on your clicker
Press * to access Setup Menu
Scroll to find “ID;” hit Enter (green button)
Enter your Student ID so I can give you
credit; hit enter
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Check Clicker Setup
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In DL on Thursday, Friday, or Monday we
talked about…
A) Three-phase diagrams and the heat pack
B) Waves and Oscillators
C) Steady-state flow in a fluid circuit
D) Slow down--I didn’t get my ID entered yet!
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Big Ideas of 7C
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Wave Model
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Ray Model
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Optics
Field Model
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Interference
Electricity
Magnetism
Quantum Mechanics
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Simple Harmonic Oscillation
Review
How can we describe the motion of oscillating objects?
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Simple Harmonic Motion
(SHM) Constructs
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Amplitude: maximum distance from equilibrium
Period (or frequency): amount of time required to
complete a cycle (or number of cycles per unit time)
Equilibrium: position at which all forces acting on
the object sum to zero.
Displacement: position of the object relative to
equilibrium
Restoring Force: a force that acts on an object that
tends move it toward equilibrium
Defining SHM: The restoring force is proportional to
the displacement.
Fx  k x
Anything missing?
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Mathematics of SHM
y
y=Displacement
A=Amplitude
T=Period
t
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Mathematics of SHM
y
y=Displacement
A=Amplitude
T=Period
1
6
4
t
2
3
In this image, which
numbers, if any,
show…
Displacement?
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Mathematics of SHM
y
y=Displacement
A=Amplitude
T=Period
1
6
4
t
2
3
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In this image, which
numbers, if any,
show…
Amplitude?
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Mathematics of SHM
y
y=Displacement
A=Amplitude
T=Period
1
6
4
t
2
3
In this image, which
numbers, if any,
show…
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Period?
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Mathematics of SHM
y
y=Displacement
A=Amplitude
T=Period
A
t
A
T
T
In this image, what
is the mass doing at
t=0 seconds?
Is the equation
correct as is?
y(t) = A sin (2p t/T)???
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y
Mathematics of SHM
y=Displacement
A=Amplitude
T=Period
f=phase
T
t
A
In this image, what
is the mass doing at
t=0 seconds?
In this image, what
value does f have?
y(t) = A sin (2p t/T)?
t/T + f)
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Making Waves
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Watch waves
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How does the motion you are
watching differ from the motion
of the mass-spring?
How is it the same?
What new constructs are
needed to describe waves?
What constructs can I control
when I start the wave? How do I
change each one?
What moves from one end of the
machine to the other?
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
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Wave Constructs
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Waves: A transfer of energy without bringing
along the mass.
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Particles in the medium get disturbed and collide,
but they stay oscillating about one position; they
don’t travel with the wave.
The medium does not effectively move. The
disturbance advances, that’s the wave.
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Graphing Waves
a) At a particular time (holding position constant)
b) At a particular position (holding time constant)
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Mathematics of Harmonic
Waves
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Displacement (y) is a function of both position
along the medium and time. y(x,t)
In space, function repeats every wavelength
In time, function repeats every period
t
x
y(x, t)  A sin ( 2p
 2p
 )
T
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Longitudinal
vs. Transverse
`
Wave Polarization
Longitudinal Wave
Transverse Wave
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