2. Welcome to Physical Science!
Do Now: Simplify the two expressions below. Write your answers in both scientific notation format and regular format.

3. Accuracy vs Precision
I need a volunteer….

4. Accuracy vs Precision Accuracy: Precision:
A description of how close a measurement is to the true value of the quantity measured
Precision:
The exactness of a measurement

5. Here are two groups’ measurements. Who was more precise
Here are two groups’ measurements. Who was more precise? Justify your answer.

6. Fun Fact

7. Why Accuracy and Precision?

8. “Significant Figures”
Significant Figures: A prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement

9. Estimate this: 𝐶𝑒𝑛𝑡𝑖𝑚𝑒𝑡𝑒𝑟𝑠
When using significant figures, you can estimate to 1 decimal place (1/10th) of the smallest given unit.

10. Estimate this:

11. But why?
Significant figures indicate the degree of accuracy -- the minimum amount by which a quantity is distinguished to be different from a similar amount. 
For example, one might say a car costs $12,000.  that implies that it costs more than $11,000 and less than $13,000. 

12. But why?
Significant figures tell us how to round, but they also make sure that the answer we get from a math problem is not more precise than the numbers that we started with.
Calculate the volume of a room that is m high, 4.25 m wide, an 5.75 m long.

13. If given a measurement…
What numbers are significant. There are 5 rules:

15. Practice:
Determine the number of significant figures in each

16. Practice:
Determine the number of significant figures in each measurement:

17. Calculations using Significant Figures
When Multiplying and Dividing: Limit and round to the least number of significant figures in any of the factors

18. Calculations using Significant Figures
When Adding and Subtracting: Limit and round to the least number of decimal places in any number that make up your answer.

19. Practice
Perform the following operations expressing the answer in the correct number of significant figures.

20. Make your own Measurement System
Can you come up with your own unique measurement system.
Pick 4 objects, and come up with conversions from smallest to biggest.
Use these conversions to create 8 different conversion problems, and their solutions.