1. Do First
Actions: Turn in yesterday’s significant figures worksheet if you didn’t get it stamped yesterday 1. Convert 576 mm to m. Write your answer in scientific notation with only two significant figures.

2. Agenda
Dimensional Analysis Notes
Dimensional Analysis Practice

3. Dimensional Analysis
Dimensional analysis is a systematic approach to problem solving that uses conversion factors to move, or convert, from one unit to another (very similar to converting among metric units)
A conversion factor is a ratio of equivalent values having different units, and are derived from equality relationships
Multiplying a quantity by a conversion factor changes the units of the quantity without changing its value

4. Dimensional Analysis
A conversion factor used in dimensional analysis to accomplish two things:
It must cancel one unit
It must introduce a new unit
While working through a problem, all of the units except the desired unit must cancel
In order for units to cancel, one must be in the numerator and one must be in the denominator

5. Dimensional Analysis
Example 1: How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices in each pizza?
What do we know?
32 people (no comparison)
3 slices per person
8 slices per pizza
What do we WANT know?
How many pizzas

6. Dimensional Analysis
Example 1: How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices in each pizza?

7. Dimensional Analysis
How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices in each pizza?

8. Dimensional Analysis
Example 1: How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices in each pizza?
Now do JUST as the equations says…
32 MULTIPLIED by 3; DIVIDED by 8 =

9. Dimensional Analysis
Example 1: How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices in each pizza?

10. Dimensional Analysis
Example 2: How many eight-packs of water would you need if the 32 people attending the party each had two bottles of water?
What do we know?
32 people (no comparison)
2 bottles per person
1 eight-pack = 8 bottles
What do we WANT know?
How many eight-packs

11. Dimensional Analysis
Example 2: How many eight-packs of water would you need if the 32 people attending the party each had two bottles of water?

12. Dimensional Analysis
Example 2: How many eight-packs of water would you need if the 32 people attending the party each had two bottles of water?

13. Dimensional Analysis
Example 2: How many eight-packs of water would you need if the 32 people attending the party each had two bottles of water?
Now do JUST as the equations says…
32 MULTIPLIED by 2; DIVIDED by 8 =

14. Dimensional Analysis
Example 2: How many eight-packs of water would you need if the 32 people attending the party each had two bottles of water?

15. Dimensional Analysis Practice
Work to complete the practice worksheet
SHOW YOUR WORK
Raise your hand if you need help but ask you neighbor first

16. DYL
1. If 2 homework assignments are assigned a day. How many assignments will a student complete in a school year if there are 36 weeks in a school year?