Collect handouts
• Index card
• Clickers usage form
I am
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2. Male
Your age is
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Over 60
I have graduated from high school.
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1. Yes
2. No
Which best describes your ethnic
background?
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African-American
Asian-American
Native-American
Hispanic-American
African (not American)
Asian (not American)
White, non-Hispanic
Multicultural
Other
How would most of your friends have
answered the previous question?
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Most of them would answer similarly
Many similarly, some differently
Half similarly, half differently
Many differently, some similarly
Most of them would answer differently
Do you want to teach when you
finish school?
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No
I am training to be a teacher
I’m thinking about becoming a teacher
I already teach
How many hours a week are you
employed?
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more than 35
25- 34
15-24
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less than 5
Why are you taking this course?
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Purely for fun
As a prerequisite for Physics 1A
I need to take both 2A & 2B
I need specifically this 1 physics class
Trying to “find myself”
I feel ___ about this class. Select
all that apply.
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enthusiastic
interested
worried/nervous
confident
nothing
Kinematics -- definitions
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Position
Displacement
Average velocity
Instantaneous Velocity (what we’ll use) =
Acceleration – WAIT TO DO THIS TIL LATER.
Vectors.
We will start in only 1-D, L/R, U/D, NS/EW etc.
Graphical interpretations, generate the formulae
Sign choices
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•
•
•
To the right (east)  always +
To the left (west)  always –
Up (north)  always +
Down (south)  always –
Notation
• Use notation on the “format” handout
• Delta symbol: D
– What it means
• Do examples of +/- x, v
Average velocity definition
A car travels 60 mph for 2 minutes and 20 mph
also for 2 minutes. Which is of the following is
closest to the average velocity?
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60 mph
50 mph
40 mph
30 mph
20 mph
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A car travels 60 mph for 2 minutes and 20 mph for
60,000 minutes. Which is of the following is closest
to the average velocity?
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2.
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60 mph
50 mph
40 mph
30 mph
20 mph
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Is the average velocity:
1. More than 20 mph
2. Less than 20 mph
3. Equal to 20 mph
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A car travels 60 mph for 30 minutes and 20 mph
for 60 minutes. Which is of the following is closest
to the average velocity?
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2.
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60 mph
50 mph
40 mph
30 mph
20 mph
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2 cars paths
• Car A goes:
– 60 mph for an hour
– Takes a 15 min break
– 30 mph for ½ hr
• Car B starts at the same place at the same
time AND finishes at the same place at the
same time. How fast did car B go?
• This question is the same as an easier
version: ….
• Draw graphs of x-t (slope) and v-t (area)
• Discuss slope of v-t graph BRIEFLY.