Physical Science Ch2: sec1


Published on

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

  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Physical Science Ch2: sec1

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