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PHY 211: 002/004/006/008/010General Physics I
Lecturer: Dr. Brad PlasterAssistant Professor of Physics
[email protected] Professor of Physics
Office: 281 Chemistry‐Physics BuildingOffice Tel: 257‐3960
Office Hours:
Office Tel: 257 3960
Office Hours:Tuesdays, 2:00 p.m. – 4:00 p.m.
W d d 1 00 2 00and by appointment (send email) 1
Wednesdays, 1:00 p.m. – 2:00 p.m.
Why Study Physics ?
• Physics principles underlie many facets of modern y p p ylife as we know it !
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Why Study Physics ?
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What is PHY 211 ?
• Goal of PHY 211: Deepen your understanding of physics
+ Develop your analytical‐thinking, problem‐solving,
and quantitative‐reasoning skills MCAT success !!and quantitative reasoning skills MCAT success !!
PHY 211 ill f h b h f h i k• PHY 211 will focus on the branch of physics known as mechanics: Study of the physical laws of motion.
Galileo, Newton, Einstein, …
• Mathematics is the language of physics.g g p y
Will use algebra and trigonometry frequently throughout this course.throughout this course.
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What is PHY 211 ?
• Course divided roughly into 4 topical areas
• Topic 1: Basics of Mechanics Velocity, Acceleration, Gravity, Newton’s Laws of Motion
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What is PHY 211 ?
• Course divided roughly into 4 topical areas
• Topic 2: Energy, Momentum, Centripetal Acceleration Kinetic and Potential Energy, Power, Collisions,
Rocket Propulsion, Gravitation, Planetary Motion
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What is PHY 211 ?
• Course divided roughly into 4 topical areas
• Topic 3: Rotational Motion Torque, Moments of Inertia, Angular Acceleration,
Angular Momentum
http://www.youtube.com/watch?v=J6aSOpy2Z9g
Figure Skater: (3:40 – 3:55)
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What is PHY 211 ?
• Course divided roughly into 4 topical areas
• Topic 4: Buoyancy, Fluid Motion, Simple Harmonic Motion, Waves
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Course Structure: Lectures
• Lectures: TR, 11:00 a.m. – 12:15 p.m.
Discuss and expound upon material in the textbook.
• Textbook
College Physics (Eighth Edition)College Physics (Eighth Edition)
Serway/Vuille/Faughn
• Webpage: Blackboardp g
http://elearning.uky.edu
Syllabus with complete Course Schedule posted thereSyllabus with complete Course Schedule posted there.
View your grades. 9
Course Structure: Homework• Ten (10) homework assignments (see Course Schedule).
15 – 25 problems on each HW assignment.
WebAssign: Register ASAP !! (First HW due Sept 1)
https://www.webassign.net/student.html
Class Key: uky 6135 8279
10 attempts at each individual problem.p p
Numerical tolerance of ±2%.
Due at 11:00 p m on indicated dates10
Due at 11:00 p.m. on indicated dates.
Late homework will NOT be accepted.
Course Structure: Recitation SectionsSection Recitation Time Instructor
002 W 9 00 a m Mr Hao Zhang002 W 9:00 a.m. Mr. Hao Zhang
004 W 10:00 a.m. Mr. Hao Zhang
lf h006 W 11:00 a.m. Dr. Wolfgang Korsch
008 W 12:00 p.m. Dr. Michael Kovash
010 W 1:00 p.m. Mr. Pratik Dhuvad
• Develop your problem‐solving skills Bring questionsDevelop your problem solving skills. Bring questions on the HW !! (more useful if start HW before class)
• Short quiz (5 10 minutes) given at beginning of• Short quiz (5–10 minutes) given at beginning of recitation on dates indicated (11 total). May be similar to part(s) of a current HW problem
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May be similar to part(s) of a current HW problem.
No make‐up quizzes.
Course Structure: Laboratory Sessions
Section Laboratory Time Instructor
002 W 9:00 a.m. Mr. Andrew McNamara
004 W 10:00 a.m. Mr. Weihua Zhu
006 W 11:00 a.m. Mr. Jin Xu
008 W 12:00 p.m. Mr. Mathias Boland008 W 12:00 p.m. Mr. Mathias Boland
010 W 1:00 p.m. Mr. Pratik Dhuvad
• Administered independently of the lectures and recitations Information sheet posted on Blackboardrecitations. Information sheet posted on Blackboard. Please read ASAP (info on lab manual, calculators, etc.).
12• Labs start the week of September 13th.
Course Structure: Exams
Exam Date Points
1 Thurs Sept 23 100
2 Thurs Oct 21 1002 Thurs Oct 21 100
3 Thurs Nov 18 100
Final Thurs Dec 16 200Final Thurs Dec 16 200
All ill b l d b k/ l d• All exams will be closed‐book/closed‐note.
• Formula sheet will be provided (posted in advance).
• Will be allowed to use a scientific calculator.
• Final exam will be comprehensive.
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Final exam will be comprehensive.
Grading Policy
Homework 100
Recitation Quizzes 100 A 90.00% – 100.00%Laboratory Sessions 200
Exam 1 100B 80.00% – 89.99%
C 65.00% – 79.00%Exam 2 100
Exam 3 100D 50.00% – 64.99%
E 0% – 49.99%Final Exam 200
Total 900
E 0% 49.99%
Your final letter grade will be no lower than
indicated hereEach recitation quiz will be 10 points.11 quizzes Can earn “bonus points”
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11 quizzes Can earn bonus points .Thus, no make‐up quizzes.
Other Items
• Course Evaluation: You get to evaluate me !
Details in syllabus, also reminder later in semester
5 point bonus to final grade for completing evaluation5 point bonus to final grade for completing evaluation
• Classroom and Learning Accommodations
Disability Resource Center, 7‐2754, Room 2 Alumni Gym
• Academic Honesty
Cheating on exams will absolutely not be toleratedg y
• Please silence your cell phones/PDAs during lectures
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Need Help ?
• If you are having difficulties, don’t wait to ask for h l l ’ l !help until it’s too late !
• Office hours: Lecturer Recitation/Lab Instructors• Office hours: Lecturer, Recitation/Lab Instructors– Can attend any of these office hours (posted on Bb)
• Physics Resource Room (staffed M‐F, 9‐5)
Room 310J of the M I King Science LibraryRoom 310J of the M.I. King Science Library
Graduate students in physics paid to assist
all walk‐in students with physics questions
• Department maintains list of private tutors See• Department maintains list of private tutors. See syllabus for webpage link. 16
PHY 211PHY 211
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SI Units: Length, Mass, Time• Laws of physics involve physical quantities such as Forces,
Velocity Acceleration Momentum Energy VolumeVelocity, Acceleration, Momentum, Energy, Volume, …
• In mechanics, all of these can be described in terms of the more fundamental quantities:o e u da e a qua es
Length Mass Time
• Standard system of units for these fundamental quantities:
SI: Système International
Quantity SI Unit
Length meter
Mass kilogram
Distance traveled by light in 1/299792458 second
Mass of a specific platinum‐iridium alloy cylinder in France
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Time second 9.1926317 109 times the period of oscillation of radiationemitted from Cesium atom (“atomic clock”)
Dimensional Analysis• Physics: “Dimension” denotes the physical nature of a quantity.
Example: Distance (length) between UK and the U of LouisvilleExample: Distance (length) between UK and the U. of Louisville
can be measured in miles, kilometers, feet, etc.
• Use symbols L, M, and T to denote dimensions of length, mass, and time.and time.
• Use brackets […] to denote the dimensions of a physical quantity.
• Examples of variables with dimensions:
Time t: [t] = T
Length x: [x] = L
Velocity v: [v] = L / T
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Acceleration a: [a] = L / T2
Dimensional Analysis• Dimensions can be treated as algebraic quantities.
f l f h k h h k !• Useful for checking whether or not your answer makes sense !
• Suppose you derived an equation on an exam:
v = at2
• Can this be correct ?
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Conversion of Units• Sometimes it is necessary to convert from one system of units to
a different system of units [Example: Driving in Europe kph !]a different system of units. [Example: Driving in Europe, kph !]
• Extensive list of conversion factors in front cover of textbook.
• Units can be treated as algebraic quantities that cancel each• Units can be treated as algebraic quantities that cancel each other.
• Example: Driving in Germany on the Autobahn at speed of 50 m/s. How fast are you going in mph?
Front Cover
1 m = 3.281 ft 1 mile = 5280 ft 1 h = 3600 s1 m 3.281 ft 1 mile 5280 ft 1 h 3600 s
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Coordinate Systems
• Many aspects of physics deal with locations/positions in space. h h d f f d h h dThis requires the definition of a coordinate system which is used to specify locations in space.
• A coordinate system must consist of the following:Fixed reference point “O” (the origin)– Fixed reference point “O” (the origin)
– Set of specified axes (or directions), with scale and labels on the axes
– Instructions on labeling a point in space relative to the origin and axesg p p g
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Cartesian (Rectangular)C di t S tCoordinate System
y (m)y ( )
An arbitrary point is l b l d h( ) labeled with its coordinates (x,y)
(x,y)(−3, 4)
origin O = (0,0)
x (m)
(2 2)( 6 2 ) (2,−2)(−6, −2 )
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Polar Coordinates
Points located in space by d ( θ)
ycoordinates (r, θ)
r : distance from origin, O
y
θ : angle between a reference line and a line drawn from O to the point
rr
θr > 0 : always !
θ > 0 : counter‐clockwise
f li
θ > 0 : counter clockwise from x‐axis
θ l k i f i
x
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reference line(positive x‐axis)
θ < 0 : clockwise from x‐axis
Review of Trigonometry
yθi(opp) xθ
(adj)y
ry
θsin(hyp) r
θcos(hyp)
xy
θcosθsinθtan (opp)
( dj)
r
xθcos (adj)
θ
r y 1θcosθsin 22 222
xθx
222 ryx Pythagorean Th !
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xTheorem !
Example: Problem 1.41
(a) Length of unknownθ
6 00 m
(a) Length of unknown side?
φ9.00 m6.00 m (b) tan of θ = ?
(c) sin of φ ?(c) sin of φ = ?
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Reading Assignment
• For today’s class: 1.1 – 1.9
• Next class: 2.1 – 2.4
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