Physics 207, Sections: 302/602 – 313/616
General Physics
Faculty Instructors:
Michael Winokur
Deniz Yavuz
Agenda for Today

Course Introduction
 Course structure
 Course scope
 Begin chapter 1
Course Homepage:
http://www.physics.wisc.edu/undergrads/courses/fall2011/207/
Physics 207: Text, Homework, Lecture, Discussion, Lab, Exams
Physics 207: Lecture 1, Pg 1
General Announcements

Text: Randall Knight,
Physics for Scientists and Engineers
with Modern Physics
 Reading Assignments (due BEFORE class)
For Wed. Sep. 7th: Chapters 1 & 2 (2.1-2.4)
Position, Time, Change (i.e. motion),
Vectors, Units, Assessment
New: Reading Quizzes
 HW0: Due Thurs. 9/8 at 11:59 PM
(Mastering Physics Practice Set )
Mastering Physics registration: see
http://www.physics.wisc.edu/undergrads/courses/fall11/207/HW.htm
Homework will usually be due by 11:59 PM on Tuesdays with a 1% per
hour penalty (up to 50% maximum)
Physics 207: Lecture 1, Pg 2
Announcements, cont’d

Labs
 http://www.physics.wisc.edu/undergrads/courses/fall2011/207/labs.htm


 Rm. 4310 Chamberlin Hall, begin on Monday Sept. 12
 At most, one formal write-ups, mostly worksheets
Lectures: Mondays & Wednesdays, 8:50-9:40am
(Revised notes will be posted at the course website)
Scope: Chapters 1 through 21 (except 14) in Knight
Class moves very quickly!
Physics 207: Lecture 1, Pg 3
Announcements, cont’d

Honors students: One Friday seminar per week (including
exams weeks, may miss up to two) + “fun” group project

Drop in tutoring: In room 2131 Chamberlain (shared with
Physics 201, starting on 9/12)
http://www.physics.wisc.edu/undergrads/courses/current/207/consult.htm

Discussion Sections: Start Wednesday
 Thursday: centers on cooperative learning exercises
 Tuesday: homework & class business
 Remember that your TAs have other obligations (they are not
27/7 tech support services)
Physics 207: Lecture 1, Pg 4
Grading

Several components:
 Lecture: Occasional reading quizzes (2%)
 Homework Sets (14%)
 Exams:
Three evening midterms (16%) and a final (22%)
 Discussion section: (5%)
 Participation/attendance
 Labs: (9%)
 Mostly worksheets (up to one formal write up)
 May miss up to one lab (with a valid excuse)
(final grade will be lowered if more)
Physics 207: Lecture 1, Pg 5
Lecture

Three main components:
 Discussion class material
» Selected topics from text
 Demonstrations of physical phenomenon
» Physics is an experimental science
Example: Ping-pong ball bazooka
Similar principle is used in
needleless air gun injectors
Act
Physics 207: Lecture 1, Pg 6
Lecture
Interactive exercise with conceptual
“Active Learning” problems
» Critical thinking and problem solving
(Almost no memorization required)
Physics 207: Lecture 1, Pg 7
A quick “quiz” on what not to do…

Please read and study the following paragraph for a minute
or so.
 “Last
Fernday, George and Tony were in
Donlon peppering gloopy saples and
cleaming, burly greps. Suddenly, a ditty
strezzle boofed into George’s grep. Tony
blaired, “Oh George, that ditty strezzle is
boofing your grep!”

After reading and studying the paragraph, and without
referring to the paragraph, please answer the following
questions:
Physics 207: Lecture 1, Pg 8
A quick “quiz” on what not to do…

1 . When were George and Tony in Donlon?

2 . What did the ditty strezzle do to George’s grep?
3 . What kind of saples did George and Tony pepper?
4 . What was Tony’s reaction?
5 . What do you imagine happened next?
6 . Based on the incidents in this story, do you think
George and Tony will want to return to Donlon? Why or
why not?




Physics 207: Lecture 1, Pg 9
A quick “quiz” on what not to do…

1 . When were George and Tony in Donlon?
Fernday
 2 . What did the ditty strezzle do to George’s grep?
Boofed
 3 . What kind of saples did George and Tony pepper?
Gloopy
 4 . What was Tony’s reaction?
Blaired
 5 . What do you imagine happened next?
 6 . Based on the incidents in this story, do you think George
and Tony will want to return to Donlon? Why or why not?
So, do you think you did well on the quiz?
What do you think you actually “learned”?
Physics 207: Lecture 1, Pg 10
Course Objectives

To begin to understand basic principles (e.g. Newton's
Laws) and their consequences (e.g. conservation of
momentum, etc.)

To solve problems using both quantitative and
qualitative applications of these physical principles

To develop an intuition of the physical world

Rote use of formulas is not what physics is about
Physics 207: Lecture 1, Pg 11
Scope of Physics 207

Classical Mechanics:
 Mechanics: How and why things work.
Motion (dynamics), balance (statics), energy,
vibrations
Classical:
» Not too fast (v << c), c ≡ speed of light
» Not too small (d >> atom), atoms  10-9 m

Most everyday situations can be described in these terms.
 Path of baseball (or a ping pong ball)
 Path of rubber ball bouncing against a wall
 Vibrations in elastic materials (Vibration Demo)
(These reflect Newton’s Laws and forces)
 Properties of matter; a roll of the dice (Thermodynamics)
Physics 207: Lecture 1, Pg 12
Chladni patterns
See http://www.phys.unsw.edu.au/jw/chladni.html for more info
Physics 207: Lecture 1, Pg 13
Chapter 1:

Position (where) and Time (when)
 Time
 Displacement versus time (velocity)
 Systems of units
 Dimensional Analysis
 Significant digits

At right is the world’s smallest
biped: A single molecule of
kinesin, walks along a cellular
microtubule fiber, pulling along
behind it a vesicle of nutrients
 http://www.ted.com/index.php/talks/sheila_patek_clocks_the_fastest_animals.html
Physics 207: Lecture 1, Pg 14
Chapter 1 & 2 Objectives

Understand particle one-dimensional motion

Use motion diagrams

Distinguish position, velocity & acceleration

Gain experience with vector algebra

Understand proper use of significant figures

Understand position vs. time graphs
Physics 207: Lecture 1, Pg 15
Position and Time

An example below:
Question: What is happening in the two time elapse
sequences shown below?
What construction could I use to quantify it?
Physics 207: Lecture 1, Pg 16
A preliminary step



Predicated on the need to know where and when?
Where requires a spatial reference frame and a system
specifying position (magnitude, direction and units)
When requires a temporal reference frame (magnitude,
direction and units)
1
6
2
3
5
4
4
3
5
6
2
1
Physics 207: Lecture 1, Pg 18
A preliminary step
Predicated on the need to know where and when?
 Where requires a spatial reference frame and a system
specifying position (magnitude, direction and units)
 When requires a temporal reference frame (magnitude,
direction and units)
time
1
2
3
4
5
6

(sec.)
position 1
2
3
4
5
6
(meters)
A particle representation
Physics 207: Lecture 1, Pg 19
Different representations
Pictorial
time (sec) 1
2
3
4
5
6
position 1
(meters)
2
3
4
5
6
x (meters)
Graphical
displacement vector
6
4
Algebraic
2
0
x = t · (1 meter/sec)
2
4
t (seconds)
6
Physics 207: Lecture 1, Pg 20
A slightly more complicated example
Pictoral
time 1
(sec)
2
x (meters)
3
Graphical
4
5
6
displacement vector
6
4
2
Algebraic
0
x = x0 + v0 t + at2
2
4
t (seconds)
6
meters/sec
Physics 207: Lecture 1, Pg 21
Test your understanding
Three motion diagrams are shown below. Which is
(1) a dust particle settling to the floor at constant speed
(2) a ball dropped from the roof of a building
(3) a descending rocket slowing to make a soft landing
on Mars?
A. (a) is dust, (b) is ball, (c) is rocket
B. (a) is ball, (b) is dust, (c) is rocket
C. (a) is rocket, (b) is dust, (c) is ball
D. (a) is rocket, (b) is ball, (c) is dust
E. (a) is ball, (b) is rocket, (c) is dust
Physics 207: Lecture 1, Pg 22
Standard Quantities



Basic elements of substances and motion.
All things in classical mechanics can be
expressed in terms of the fundamental quantities:
 Length L
 Mass M
 Time T
Some examples of more complicated quantities:
 Speed has the quantity of L / T (i.e. miles per hour)
 Acceleration has the quantity of L/T2 (Chapter 2)
 Force has the quantity of ML / T2 (Chapter 4)
Physics 207: Lecture 1, Pg 23
Units

SI (Système International) Units:
 mks: L = meters (m), M = kilograms (kg), T = seconds (s)

British Units:
 L = inches, feet, miles, M = slugs (pounds), T = seconds

We will use mostly SI units, but you may run across some
problems using British units. You should know how to convert
back & forth.

Ask yourself, why do units matter?
Physics 207: Lecture 1, Pg 24
Recap

For Wednesday’s class
» Work on HW0, start HW1
» Read Chapters 1 & 2 (through section 2.4)
Physics 207: Lecture 1, Pg 25