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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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### Transcript

• 1. Physical Science: CH 2 , Sec 1 Page 40
• 2. Warm Up
• Make a list of
• observations
• Form a scientific question about the picture.
• Make a hypothesis.
• Describe data and tools you would need to test your hypothesis.
• 3. Data in Science
• The Big Idea:
• Scientists use tools to collect, organize, and analyze data while conducting investigations.
• Tools must be accurate.
• 4. International System of Units
• (AKA Metric System)
• Universal system for science
• System works by multiples of 10
• 5. 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
• 6. 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)
• 7. 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
• 8. 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
• 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
• 10. 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
• 11. Models in Science
• Models are representations of an object or system.
• 12. Physical Models
• Show an example at a reasonable scale.
• Examples: model airplanes, model solar system, model of an atom.
• 13. 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.
• 14.
• 15. 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:
• 16. 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?
• 17. 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.
• 18. 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
• 19. Homework 9/21/10
• TO BE COMPLETED IN NOTEBOOK
• Due 9/22/10
• Section Review page 49:
• #s 2, 6 -11, and 13