1. Physical Science: CH 2 , Sec 1
Page 40

2. 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.

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
King Henry Doesn’t Usually Drink Chocolate Milk
Kilo, Hecto, Decka, Unit, Deci, Centi, Mili
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 meters3 (m3)
1mL = 1cm3
Density is measured by Mass / Volume
grams/ liters or meters3 ( 1 g/cm3 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 = 373 K

8. Practice
What is the density of an object with a mass of 15g and volume of 3 cm3?
Normal body temperature is 37°C, what is that in Kelvin?
26 cm = ____ hm
91 m = ____ km
6 km = ____ mm

9. Practice Answers 15g ÷ 3cm3 = 5 g/cm3 37°C + 273 = 310 K
26 cm = hm
91 m = 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.

15. Mathematical Models Uses math to represent the physical world.
Simple math models:
Force = Mass x Acceleration
E=Mc2
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