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Metrics Pp

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Transcript

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