2. Unit 2: Measurement & Data 8 th Grade Mrs. Williams

3. 3 Types of Graphs 3 Types of Graphs 1.line graph shows relationship where the dependent variable changes b/c of the independent variable Scatter plot Scatter plot http://4.bp.blogspot.com/_46URaoUSp0A/S9B6OMq9qfI/AAAAAAAAAGE/IcQA37CwMT4/s1 600/scatterplot.gif

4. 2. Bar graph compare information collected by counting. 3. Circle or Pie graph show how a whole is broken into parts.

5. Model- Model-representation of an object or a process that allows scientist to study something in greater detail.

6. Measurement- description that includes a number and unit SI (International System of Units)- improved version of the metric system used worldwide. Based on multiples of 10.

7. Base Units 1. 1. Length (m)-distance between 2 points 2. 2. Mass (kg)-how much matter is in an object 3. 3. Time (s)-interval between 2 events 4. 4. Temperature (K or ˚C)- how hot or how cold something is 5. 5. Volume (L, or cm 3 )-amount of space occupied by an object

8. Density -mass per unit volume of a material OR simply how packed together something is. The unit is g/cm 3 for example: g=grams and cm 3 =volume

9. kilo- hecto- deka- deci- centi- milli- 0.1 = 0.01 = 0.001 = Univeral m, L, g centi- deci- milli- deka- hecto kilo-

10. 54 hm = ? cm

11. 54 1. Copy the # 2. Find Dewey m cm dm mm dkm hm km 54 hm = ? cm 3. Move Dewey 0000cm x

12. 540,000 cm 54 hm = ? cm

13. 1 dm = ? m

14. 1 1. Copy the # 2. Find Dewey m cm dm mm dkm hm km 1 dm = ? m 3. Move Dewey m x

15. .1 m 1 dm = ? m Measurements must have a # & a unit.

16. .1 m 1 dm = ? m 0

17. Scientific Notation- short way of representing very large or very small numbers

18. Accuracy-description of how close a measurement is to the true value of the quantity measured. Precision-the exactness of a measurement.