1. Scientific Notation Do you know this number? 300 000 000 m/sec
It’s the speed of light
What about this number?
kg?
It’s the mass of a dust particle

2. These number are too big and take too long to write, so scientists came up with a shorter method called SCIENTIFIC NOTATION
Based on powers of the base number 10
Ex in scientific notation is:
1.23 X 1011
The first number 1.23 is the coefficient (it must be greater than or equal to 1, and less than 10
The second number is the base. It is always 10.
The third number is the exponent or power of ten.

3. How to write a number in Scientific NotationEx
Place a decimal after the first digit and drop the zeros
1.23
 the coefficient
To find the exponent count the number of places from the decimal to the end of the number.
In there are 11 places
So the exponent is 11
in scientific notation is 1.23 X 1011

4. It is similar for small numbers
The only difference is numbers less than 1 will have a negative exponent
Ex sec
1.0 is the coefficient
There are 6 places from the decimal so the exponent is 6
1.0 X 10-6

5. Section A and B on the practice sheet
Let’s Try
Page 587 Questions 1 and 2
Section A and B on the practice sheet

6. Using your Calculator
Complete section C on the practice sheet

7. Measurement
Measurement is the process of estimating the magnitude of some attribute of an object, such as its length, weight, or depth relative to some standard (unit of measurement), such as a meter or a kilogram.
The term is also used to indicate the number that results from that process

8. The act of measuring usually involves using a measuring instrument, such as a ruler, weighing scale, thermometer, speedometer, or voltmeter, which is calibrated to compare the measured attribute to a measurement unit.

9. Measurements always have errors and therefore uncertainties

10. Accuracy vs. Precision BRAINSTORM
Accuracy: describes the nearness of a measurement to the standard or true value
Precision: the amount of information that the instrument can provide

11. Precise or Accurate?
The TV weather forecaster says that it will be between 40 and 50 degrees today. The actual reading turns out to be 43.
The forecast was accurate, but not very precise.
For tomorrow, the forecast is degrees at 4 PM. It turns out to be degrees.
This forecast was very precise, but completely inaccurate.

12. Precise or Accurate Ms. Borden’s mass is 550.25 kg !!
It is precise but not at all accurate
Unless of course she looks like……

13. Now You Try
In groups of 4 take 5 minutes to come up with your own situation to try and stump the class!