1. Agenda (CP) Check off and go over HW Lab Safety Quiz (open notes)
Fire Evacuation Spot
Start “Physics Activity #1”

2. HW Answers
17) 6 x ) 2 x ) 6.7 x ) 3.9 x ) 9.45 x ) 5.28 x 10-6

3. HW Answers
23) ) ) ) ) )

4. Agenda (ED) Safety Video / Lab Safety First Quiz on Friday 9/5/14
“Lab Safety” (open note)
The Dreaded Stairs
White Boards
Presentation

5. Scientific Notation
9/4/14

6. Agenda (CP) Go over HW Math Skills and Physics
First Quiz on Friday 9/5/14
“Lab Safety” (open note)
Scientific Notation
#HW 17-28
Experimental Design
ALL beginning year forms due by Friday 9/5/14

7. Scientific Notation

8. Scientific Notation
Scientific Notation: A way to write very large or very small numbers in a compact way
Use scientific notation for numbers larger then 10,000 and smaller then 0.001

9. Scientific Notation The components of scientific notation:
8.238 x 10-31
“8.238” is the coefficient
“x 10” is the base
“-31” is the exponent
Where the coefficient has to be a number:
1 ≤ coefficient < 10

10. Scientific Notation
The Andromeda Galaxy contains at about 200,000,000,000 stars.
Mass of a dust particle is kg .

11. Scientific Notation 200,000,000,000 stars. In scientific notation is:
2 x 1011 stars

12. Scientific Notation 0.000000000753 kg In scientific notation is:
7.53 x 10-10

13. Decimal Notation Given: 3 x 106 Is: 3000000 Given: 2.84 x 10-7

14. HW Answers
17) 6 x ) 2 x ) 6.7 x ) 3.9 x ) 9.45 x ) 5.28 x 10-6

15. HW Answers
23) ) ) ) ) )

16. Rounding Calculations
8/21/13

17. Rounding to Sig. Figs. Multiplication and division of numbers
After the calculation, round the answer to the number that has the least amount of sig. figs.
Note: Addition and subtraction have different rules

18. Sig. Figs. Exceptions in Calculations
Conversion factors (metric conversion)
Scaling factors
Counting number (EX: number of trials or number of students)
Round to sig. figs. At the END of a calculation

19. Estimation vs. Measurement
What is the volume of the room?
Estimation:
Length: 17 m
Width: 7 m
Height: 3 m
Volume = 357 m3
Volume = 400 m3
Measurement:
Length: m
Width: 9.56 m
Height: 2.68 m
Volume = m3
Volume = 372 m3

20. Scientific Notation (calculators)
USE THE EXPONENT FUNCTION
(4.8 x 10-6) / (5.134 x 10-19) =
x 1012
Displays will differ
9.3 x 1012 (2 sig. figs.)

21. Scientific Notation When writing numbers in scientific notation
Express numbers as 4.71 x 10-61
≠ 4.71 x 10-61
= 8.83 x 10-42
4.71E-61 = 4.71 x 10-61

22. Example #1 3.0 x 4.31 = 12.93 3.0 (2 sig. figs.) 4.31 (3 sig. figs.)
Round to 2 sig. figs.
Final answer is 13

23. Example #2
7000 / =
7000 (1 sig. figs.)
13.87 (4 sig. figs.)
Round to 1 sig. figs.
Final answer is 500

24. Rest of Class
Work on HW: #71-82 due tomorrow
and # due Friday