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# Metrics Pp

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### Metrics Pp

1. 1. <ul><ul><li>Measurements </li></ul></ul><ul><ul><li>(use metric system) </li></ul></ul><ul><li>Measuring </li></ul><ul><ul><li>be precise/accurate </li></ul></ul><ul><ul><li>reliable/standardized </li></ul></ul><ul><ul><li>understood by audience </li></ul></ul>
2. 2. The Metric System (required in this class with a few exceptions) <ul><li>--Why use the metric system? </li></ul><ul><li>M ost of the world and scientists use SI system </li></ul><ul><ul><li>Metrics based on units of 10 (easy to convert) </li></ul></ul><ul><ul><ul><li>Kilo=1000 </li></ul></ul></ul><ul><ul><ul><li>Hecto=100 </li></ul></ul></ul><ul><ul><ul><li>Deka=10 </li></ul></ul></ul><ul><ul><ul><li>**(meter, liter, etc) </li></ul></ul></ul><ul><ul><ul><li>deci=.1 </li></ul></ul></ul><ul><ul><ul><li>centi=.01 </li></ul></ul></ul><ul><ul><ul><li>milli=.001 </li></ul></ul></ul>
3. 3. <ul><li>Length </li></ul><ul><ul><li>base unit=meter (approximately floor to hip) </li></ul></ul><ul><ul><li>cm=width of pinky </li></ul></ul><ul><ul><li>km=12 city blocks </li></ul></ul><ul><ul><li>Instruments: tape measure, ruler, meter stick </li></ul></ul>How long is this shell (cm/mm)?
4. 4. <ul><li>Liquid Volume (amount of space object takes up) </li></ul><ul><ul><li>base unit= liter </li></ul></ul><ul><ul><li>instrument=graduated cylinder (eye level)- note: read bottom of meniscus </li></ul></ul><ul><ul><li>Which has more volume? </li></ul></ul><ul><ul><ul><li>2 liters Pepsi or </li></ul></ul></ul><ul><ul><ul><li>2 liters of air </li></ul></ul></ul>How much liquid is in this graduated cylinder?
5. 5. <ul><li>Solid Volume (“size” of object) </li></ul><ul><ul><li>cubic meter </li></ul></ul><ul><ul><li>use ruler and formula (if regular shape) </li></ul></ul><ul><ul><ul><li>example: </li></ul></ul></ul><ul><ul><ul><li>rectangle/square is L x W x H </li></ul></ul></ul><ul><ul><li>use displacement (if irregular shape) </li></ul></ul><ul><ul><li>note: 1cc = 1 mL (so 5ml=5cc) </li></ul></ul><ul><ul><li>1 mL=1/5 teaspoon </li></ul></ul>Be sure all instruments START on zero****
6. 6. <ul><li>Mass (amount of matter in object) </li></ul><ul><ul><li>gram (approximately a paper clip) </li></ul></ul><ul><ul><li>Family car= 1,000 kg </li></ul></ul><ul><ul><li>Instrument: balance </li></ul></ul><ul><ul><li>be sure to start on zero!! </li></ul></ul><ul><ul><li>does not change with gravity </li></ul></ul>
7. 7. Weight <ul><li>Measure of gravitational attraction </li></ul><ul><li>you can be “weightless” </li></ul><ul><li>you weigh less on moon (same mass) </li></ul><ul><li>metric unit= Newton (an apple) </li></ul><ul><li>instrument=spring scale </li></ul><ul><li>weight= mass x 9.8 (for Earth) </li></ul><ul><li>ex: 90 kg person weighs 822 N </li></ul>
8. 8. <ul><ul><li>Celsius </li></ul></ul><ul><ul><ul><li>100º=boiling of pure water at sea level </li></ul></ul></ul><ul><ul><ul><li>0º=freezing </li></ul></ul></ul><ul><ul><ul><li>room temperature about 20-25ºC </li></ul></ul></ul><ul><ul><li>thermometer </li></ul></ul><ul><ul><li>some scientists use Kelvin </li></ul></ul><ul><ul><ul><li>add 273 to Celsius </li></ul></ul></ul><ul><ul><ul><li>0 K=absolute zero (motion stops)--theoretical </li></ul></ul></ul>Temperature
9. 10. Remember <ul><li>Mass Beam Balance grams </li></ul><ul><li>Weight Spring Scale Newtons </li></ul><ul><li>Temperature thermometer Deg. Celsius </li></ul><ul><li>Length centimeters ruler </li></ul><ul><li>Liq Volume grad cylinder mL </li></ul><ul><li>Solid Volume grad cylinder if irregular </li></ul><ul><li>ruler/formula if perfect shape cubic cm </li></ul><ul><li>Area = LxW (use ruler) units = cm 2 </li></ul>
10. 11. Density <ul><li>Mass Volume </li></ul><ul><li>units: g/mL or g/cc </li></ul><ul><li>If greater than 1, object will sink in water </li></ul><ul><li>If less than 1, object will float in water </li></ul><ul><li>Ex: 2.7 g/cc would ___________ in water. </li></ul><ul><li>use </li></ul><ul><ul><li>balance </li></ul></ul><ul><ul><li>graduated cylinder (or ruler) </li></ul></ul><ul><ul><li>(calculator) </li></ul></ul>
11. 12. Examples <ul><li>Substance Density (g/cc) </li></ul><ul><li>GOLD 19.3 </li></ul><ul><li>LEAD 11.3 </li></ul><ul><li>ALUMINUM 2.7 </li></ul><ul><li>SEAWATER 1.025 </li></ul><ul><li>PURE WATER 1.00 </li></ul><ul><li>ICE 0.92 </li></ul><ul><li>GASOLINE 0.7 </li></ul><ul><li>OAK 0.7 </li></ul><ul><li>OXYGEN 0.0014 </li></ul><ul><li>HELIUM 0.0002 </li></ul>
12. 13. TRY THIS… <ul><li>A square block of rock salt has a mass of 10.7 grams. Each edge of the block has a length of 5.0 cm. What is the density of the rock salt? (include correct units) </li></ul><ul><li>.0856 g/cc </li></ul>
13. 14. Practice measuring density <ul><li>Density of “rock”—in your groups </li></ul><ul><li>… What if you have half the amount of rock? </li></ul><ul><li>TRY THIS: </li></ul><ul><li>Assume you are in a 25 ° C room with rock that has a density of 8 g/cc. This rock glows and weighs 10 Newtons. After you carefully observe its yellow glow, you determine its mass to be 16 grams. What is the rock’s volume (include proper units)? </li></ul><ul><li>… .. 2 cm 3 </li></ul>
14. 15. More practice with density <ul><li>Density lab (liquids) </li></ul><ul><li>Density blocks </li></ul><ul><li>Coke vs Diet Coke </li></ul>
15. 17. <ul><li>..as time permits </li></ul><ul><li>Converting SI unit </li></ul><ul><ul><li>move decimal place left or right (you are multiplying or dividing by multiples of 10) </li></ul></ul><ul><ul><li>like converting between dollars and dimes </li></ul></ul>Remember King Henry
16. 18. <ul><li>King KILO 1000 </li></ul><ul><li>Henry HECTO 100 </li></ul><ul><li>Died DEKA 10 </li></ul><ul><li>Monday (m, L, g) 1 </li></ul><ul><li>Drinking deci 1/10 (.1) </li></ul><ul><li>Chocolate centi 1/100 (.01) </li></ul><ul><li>Milk milli 1/1000 (.001) </li></ul>
17. 19. Let’s try these TOGETHER… <ul><li>600 millimeters = ? meters </li></ul><ul><li>0.35 liters = ? milliliters </li></ul><ul><li>1,050 grams = ? centigrams </li></ul>
18. 20. Examples: <ul><li>3.2 meters = ________ cm </li></ul><ul><li>320 </li></ul><ul><li>3 mm = _____________dm </li></ul><ul><li>.03 </li></ul><ul><li>4.72 g = ______________kg </li></ul><ul><li>.00472 </li></ul>
19. 21. <ul><li>If you want to measure the length and width of your classroom, which SI units would you use? </li></ul><ul><li>Which unit would you use to measure the amount of matter in your textbook? </li></ul><ul><li>Which would you use to measure how much water a drinking glass holds? </li></ul><ul><li>When would you use the Celsius scale? </li></ul><ul><li>What is the smallest units on the metric ruler? </li></ul><ul><li>How many mm are there in 1 cm? </li></ul><ul><li>1,000 meters = ________km </li></ul>
20. 22. Metric Review <ul><li>Inspiration presentation </li></ul>
21. 23. What instrument and unit would you use to measure the following? <ul><li>the volume of a can of gasoline </li></ul><ul><li>the length of your foot </li></ul><ul><li>the mass of a vitamin tablet </li></ul><ul><li>the density of a cube of wood </li></ul>
22. 24. Here’s a challenge: <ul><li>25 ml= ______ cubic cm </li></ul><ul><li>Hint: 1 ml= 1 cc </li></ul><ul><li>so 25 ml= 25 cc </li></ul>
23. 25. Practice measuring... <ul><li>Metric Lab Stations as needed </li></ul>
24. 26. <ul><li>Help available most days before school </li></ul><ul><li>see me to make appt. </li></ul>
25. 27. Scientific Notation <ul><li>Diameter of sun= 1,390,000,000 meters </li></ul><ul><li>OR 1.39 x 10 9 meters </li></ul><ul><li>Diameter of one helium atom= 0.000000000244 meters </li></ul><ul><li>OR 2.44 x 10 -10 meters </li></ul>