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.
    View slide
  • International System of Units
    • (AKA Metric System)
    • Universal system for science
    • System works by multiples of 10
    View slide
  • 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