1.  Objective:  Objective: We will review measurement with a lab investigation.  Homework: Complete Measurements Lab!

2.  Objective:  Objective: We will review measurement with a lab investigation.  Homework: Complete “1. Stop and think: a. and b.” on Measurements Lab if not already finished.

3. Measurement : –a determination of the amount of something.  What are the two parts to measurement? :  Value (a number)  Unit

4. English System –Most familiar to us in U.S. –What units are common? Miles, yards, feet, pounds, pints, quarts, gallons, cups, teaspoons SI – International System of Units –Used by most countries and by the scientific community. –Metric system based on factors of 10. –Common Units? Meters, liters, grams, celsius

7. Would you say the person who shot this arrow was accurate or precise? AccuracyAccuracy – how close a measurement is to the accepted value.

8. Would you say these arrows are accurate or precise? PrecisionPrecision – how close together repeated measurements are to one another.

11. The smallest interval that can be measured. –The “sharpness” of a measurement.

12. ~ Write Your Name ~ ~ Write Your Name ~  Objective:  Objective: We will briefly discuss conversions and finish our lab investigation of measurement.  Homework: Complete “Measurements” lab and answer HW questions on pg. 5 of lab.

13. ~ Write Your Name ~ ~ Write Your Name ~  Objective:  Objective: We will briefly discuss conversions and finish our lab investigation of measurement.  Homework: Complete “Measurements” lab and answer HW questions on pg. 5 of lab.

14. Have you ever had to convert something? Can you give an example? –Conversions help us to relate quantities. –Conversion Factor – a ratio that is used when setting up a unit conversion problem. It is often used when you want to convert SI units to English units. Ex. - Convert 4.5 ft to cmEx. - Convert 4.5 ft to cm (there are 30.48 cm in 1 foot)

15. Use the Decimal Point Rule and conversion chains! K ing H enry D ied B y D rinking C hocolate M ilk Given: How many decimeters in 0.0025 kilometers?

16. K ing H enry D ied B y D rinking C hocolate M ilk

17. Visual Representations of data that are used to show how variables are related. What are some ways that graphs are used in our daily lives or in the scientific community?

18. Various Types of graphs: –Scatterplot graph ( XY graph) – used to visualize 2 variables thought to be related –Bar graph – compares data grouped by a name or category. –Pie graph – Shows the amount each part makes up to form the whole (100%) –Line graph – often shows how data changes over time.

20. Interpreting graphs: –With scatter plot graphs, you have 2 variables Independent Variable – might influence another variable (ex. – water depth) Dependent Variable – is influenced by the independent variable (ex. – water pressure)

21. Interpreting graphs: –With scatterplot graphs and line graphs, you have direct and indirect relationships Direct relationship – one variable increases with an increase in another variable. –Ex? – Depth vs. Pressure scatterplot graph Indirect relationship – one variable decreases when another variable increases

22. MIXES TUCS: –Trick to remember how to make a graph –M: Maximize your graph –IX: Independent variable on x-axis –ES: Equally spaced scale increments –T: Title (includes axis names) –U: Units and labels on both axes –CS: Continuous smooth curve connects data

23. How to read a graph:

24. When measuring time you can answer two types of questions. What are they? –1) What time does the game begin? –2) How long does the game last? (also known as a time interval)

25. Name some familiar units of measuring time: –Seconds –Hours –Minutes –Years –Centuries

26. Distance – the amount of space between two points. –The meter stick is a common tool used for measuring length –Do you know the distance you travel to school each day? –What units do we use to measure distance? Meters, kilometers, light years (1 ly = 9.46 x 10 12 km), parsec (equals about 3.26 ly), miles, feet