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Physics 101: Lecture 1, Pg 1
Welcome to Physics 101!
Lecture 01: Introduction to Forces
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Physics 101: Lecture 1, Pg 2
YForces
YKinematics
YEnergy/Momentum
YRotations
YFluids
YWaves/Sound
YThermodynamics
Physics 101: Lecture 1, Pg 3
Meet the Lecturer
YProfessor Tom Kuhlman
tkuhlman@illinois.edu
YOffice Hours
Monday 9-10am
315 Loomis; start next week
YResearch
»Biophysics: Gene regulation, genome
organization, and intracellular diffusion
»Physics Colloquium Sept 18 4PM, 141
Loomis
http://kuhlman.physics.illinois.edu/
Physics 101: Lecture 1, Pg 4
Course Format
(upward) Spiral Learning
YPreLectures 25
YiClickers 25
YHomework 100
YLab 150
YDiscussion 100
Î11 quizzes; drop lowest 1
YHour Exams (3 x 100) 300
YFinal Exam 300
1000
Physics 101: Lecture 1, Pg 5
Excused (EX) Absences
YCan get excused absences for:
ÎDiscussions
ÎLabs
ÎExams
YONLY for:
ÎIllness
ÎEmergency
ÎRequired attendance at University event
ÎReligious observance or practice
ÎServing as volunteer emergency worker
YAbsence excuses must be submitted within
2 WEEKS of absence!
Physics 101: Lecture 1, Pg 6
Step 1
Step 2
Physics 101: Lecture 1, Pg 7
Grading Scale
Y950-1000 A+
Y920-949 A
Y900-919 A-
Y880-899 B+
Y860-879 B
Y835-859 B-
Y810-834 C+
Y780-809 C
Y750-779 C-
Y720-749 D+
Y690-719 D
Y610-689 D-
Y<610 F
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Physics 101: Lecture 1, Pg 8
Reading, Lecture, & Prelecture
YNeed to complete Prelecture BEFORE Lecture!
YAnswer prelectures 25/1000 points
ÎDue 6:00 am day of lecture.
Î1 point for honest attempt
ÎNo EX, 28 Lectures can miss three and still get all 25 points.
YEveryone gets 1 point for today!
Physics 101: Lecture 1, Pg 9
P101 Lectures
YParticipation is key!
ÎCome to lecture prepared!
Î1 point for each lecture using iclicker
»No EX, 28 Lectures: can miss three and still get all 25 points. »Available at bookstore---register using link on our web page. »Using multiple clickers is an academic integrity violation.
YNot everything you need for exams!
ÎConcepts, Connections, Motivation Lecture
ÎComprehensive Overview Text
ÎCalculations Homework, Discussion, Problem Sections
ÎHands-On Lab
YTaking Notes
ÎLecture notes will be available on webpage.
Physics 101: Lecture 1, Pg 10
P101 Homework
YWeb based (byteShelf), immediate feedback
Y100% if done before 6:00 am deadline
Y90% credit on unfinished parts until following Tuesday
Y0% after that
YAlways keep 5 significant figures!
YFirst one is due Tues Sept. 3!
Physics 101: Lecture 1, Pg 11
Discussion Sections
YDirector: Dr. Elaine Schulte
eschulte@illinois.edu
Course Manager and Instructor
YStarts tomorrow!
YQuiz during last 25 minutes of section;
11 quizzes, drop lowest score
YFirst section: math review, dimensional
analysis.
Physics 101: Lecture 01, Pg 12
P101 Labs
YDirector: Professor Munir Nayfeh
m-nayfeh@illinois.edu research: Atomic and molecular physics
YFirst Lab is Wed, Sept 4!
Y
Physics 101: Lecture 1, Pg 13
Problem Sections
YCOMPLETELY VOLUNTARY
ÎNO points, credit, or brownie points!
YSunday evenings 7-9 PM Loomis 141
Starts this Sunday!
Y textbook the proceeding Friday
YSunday evening I will work through them at the
chalkboard in detail, and you should ask questions!
Physics 101: Lecture 1, Pg 14
Email policy
1.Read the course web site before emailing staff.
2.Please DO NOT email physics or homework
questions. Use Office hours and Web Board.
3.Send questions on Lectures, Prelectures, and
Clickers to Tom Kuhlman.
4.Send questions on Discussion/Quizzes/Exams to
Elaine Schulte.
5.Send questions on Labs to Munir Nayfeh.
6.Your E-mail should have Physics 101 in the
subject line
Physics 101: Lecture 1, Pg 15
Physics Philosophy
YQuantitative approach to describing the natural world YAction/reaction, reproducible experiment, MATHEMATICAL formulation
Yobservations with a few simple ideas:
APPROXIMATION
Ysame IDEAS
Physics 101: Lecture 1, Pg 16
If there is zero net force on an object, then
its speed and direction will not change.
Inertia
If a nonzero net force is applied to an
object its motion will change FNet= ma
The forces that two interacting objects
exert on each other are equal in magnitude and opposite in direction.
Net Force Mass
Acceleration
Physics 101: Lecture 1, Pg 17
Example Forces in P101
YNon-Contact ---- Gravity
(Weight)
YG = 6.7x10-11 m3 / (kg s2)
ÎEarth: Mass = 6x1024 kg, radius = 6.4 x106 m.
YContact
ÎNormal: Perpendicular to surface
ÎFriction: Parallel to surface
ÎAnything touching the object
»Rope: Tension
»Spring 2
Earth object
Earth
MmWGrF kx
Physics 101: Lecture 1, Pg 18
Example: Weight of Object
YCalculate the gravitational force (i.e. weight) on a
3 kg book held 1 meter above the surface of the
earth.
W = G MEarth m / rEarth2
= (6.7x10-11 m3 / (kg s2)) (6x1024 kg) (3 kg)/ (6.4x106 + 1)2 m2 = 29.4 kg m/s2 = 29.4 Newtons (N)
Physics 101: Lecture 1, Pg 19
Gravitational ACT
YIf the book is raised 10 meters above the
be:
A) 100 times stronger B) 10 times stronger
C) Nearly the same
D) 10 times weaker E) 100 times weaker
W = G MEarth m / rEarth2
= (6.7x10-11 m3 / (kg s2)) (6x1024 kg) (3 kg)/ (6.4x106 + 10)2 m2 = 29.4 kg m/s2
Near surface of earth r = 6.4x106 m
W = m (G MEarth /rEarth2) = m (9.8 m/s2) = mg
quotesdbs_dbs14.pdfusesText_20
[PDF] AN INTRODUCTION TO PHYSICS