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• Clickers usage form

I am

26

13 1. Female

2. Male

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Your age is

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0

0

0

0

0

1

6

26

5 1. Under 18

2. 18-24

3. 25-29

4. 30-34

5. 35-39

6. 40-44

7. 45-49

8. 50-54

9. 55-60

10. Over 60

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I have graduated from high school.

5

34 1. Yes

2. No

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Which best describes your ethnic background?

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3

11

4

0

10

0

6

3 1. African-American

2. Asian-American

3. Native-American

4. Hispanic-American

5. African (not American)

6. Asian (not American)

7. White, non-Hispanic

8. Multicultural

9. Other

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How would most of your friends have answered the previous question?

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10

5

11

9 1. Most of them would answer similarly

2. Many similarly, some differently

3. Half similarly, half differently

4. Many differently, some similarly

5. Most of them would answer differently

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Do you want to teach when you finish school?

3

7

0

30 1. No

2. I am training to be a teacher

3. I’m thinking about becoming a teacher

4. I already teach

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How many hours a week are you employed?

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4

8

5

2 1. more than 35

2. 25- 34

3. 15-24

4. 5-14

5. less than 5

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Why are you taking this course?

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6

8

20

3 1. Purely for fun

2. As a prerequisite for Physics 1A

3. I need to take both 2A & 2B

4. I need specifically this 1 physics class

5. Trying to “find myself”

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I feel ___ about this class. Select all that apply.

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19

22

34

12 1. enthusiastic

2. interested

3. worried/nervous

4. confident

5. nothing

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Kinematics -- definitions

• 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

• 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: – 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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0

0

0

0 1. 60 mph

2. 50 mph

3. 40 mph

4. 30 mph

5. 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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0

0

0

0 1. 60 mph

2. 50 mph

3. 40 mph

4. 30 mph

5. 20 mph

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Is the average velocity:

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0

0 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?

0

0

0

0

0 1. 60 mph

2. 50 mph

3. 40 mph

4. 30 mph

5. 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.