Physical Science Ch2: sec1
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Physical Science Ch2: sec1

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Class notes 9/20/10 and 9/21/10

Class notes 9/20/10 and 9/21/10

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    Physical Science Ch2: sec1 Physical Science Ch2: sec1 Presentation Transcript

    • Physical Science: CH 2 , Sec 1 Page 40
    • Warm Up
      • Make a list of
      • observations
      • about the picture
      • Form a scientific question about the picture.
      • Make a hypothesis.
      • Describe data and tools you would need to test your hypothesis.
    • Data in Science
      • The Big Idea:
        • Scientists use tools to collect, organize, and analyze data while conducting investigations.
        • Tools must be accurate.
    • International System of Units
      • (AKA Metric System)
      • Universal system for science
      • System works by multiples of 10
    • Metric System Conversions
      • Brain Pop
      • K ing H enry D oesn’t U sually D rink C hocolate M ilk
      • K ilo, H ecto, D eck a , U nit, D eci, C enti, M ili
        • Put your pencil on the unit you are starting with
        • Loop from letter to letter until you reach the unit you want.
        • Count the loops
        • Move the decimal that many times in the same direction you move the pencil
    • Units
      • Length is in meters (m)
      • Mass is in grams (g)
      • Volume is in liters (L) or meters 3 (m 3 )
        • 1mL = 1cm 3
      • Density is measured by Mass / Volume
        • grams/ liters or meters 3 ( 1 g/cm 3 or 1 g/L)
    • Temperature
      • Temperature is in Kelvin (K) or degrees Celsius (°C) , (Not Fahrenheit)
      • 0°Celsius = 273 Kelvin
      • To convert Celsius to Kelvin just add 273
        • 100°C + 273 = 373 K
    • Practice
      • What is the density of an object with a mass of 15g and volume of 3 cm 3 ?
      • Normal body temperature is 37°C, what is that in Kelvin?
      • 26 cm = ____ hm
      • 91 m = ____ km
      • 6 km = ____ mm
    • Practice Answers
      • 15g ÷ 3cm 3 = 5 g/cm 3
      • 37°C + 273 = 310 K
      • 26 cm = 0.0026 hm
      • 91 m = 0.091 km
      • 6 km = 6,000,000 mm
    • Homework
      • TO BE COMPLETED IN NOTEBOOK
      • Define Vocabulary words on page 42:
        • Mass, volume, density, temperature, model, theory, and law.
      • Section Review page 49:
        • Questions: 1, 3, 4, 5, 12
    • Models in Science
      • Models are representations of an object or system.
    • Physical Models
      • Show an example at a reasonable scale.
      • Examples: model airplanes, model solar system, model of an atom.
    • Conceptual Model
      • Explains or summarizes with words
        • Big Bang Model:
          • 12 to 15 billion years ago an event called the big bang sent matter in all directions. This matter eventually formed the galaxies and planets.
    •  
    • Mathematical Models
      • Uses math to represent the physical world.
        • Simple math models:
          • Force  = Mass  x Acceleration
          • E=Mc 2
        • Complex math models:
          • Quantum Mechanics wave function of a particle:
    • Limits of Models
      • A model is not exactly the same as the real thing it represents
        • Example: There are many limitations of this model of the solar system:
            • Can you find some?
    • Scientific Theories
        • Theory is an explanation for many hypotheses and observations.
          •  theory of evolution,
          • the theory of relativity,
          • the atomic theory,
          • and the quantum theory
        • Theories can be changed.
    • Scientific Laws
      • A summary of many experimental results and observations.
      • Only tells you what happens, (not why or how)
        • The law of gravity,
        • Newton's laws of motion,
        • Conservation of mass
    • Homework 9/21/10
      • TO BE COMPLETED IN NOTEBOOK
      • Due 9/22/10
      • Section Review page 49:
        • #s 2, 6 -11, and 13