1. QUICK QUIZ TODAY
1. List the 6 steps that make up the scientific method
2. What is a hypothesis?
3. Why is it important to communicate the findings from our experiments?

2. Chapter 1 The World of Physical Science

3. Physical Science The study of matter and energy.
Matter is the “stuff” that everything is made of. Even the smallest of things you cant see.
All matter has energy even things that are not moving.
What other examples of matter can you think of?
Moving objects have energy, food has energy and that energy is transferred to you after digestion.

4. How is a theory different from a hypothesis?
Scientific Theories
A theory is a way to explain why something has happened. It is based on many tests and observations.
They may be wrong.
How is a theory different from a hypothesis?
Hypothesis a possible explanation
Theory is an ideal that has been supported by testing.

5. Scientific Laws
In science a law is a summary of many experimental results and observations.
A law tells you how something works. It is a statement that describes patterns in nature with no known exceptions.
Laws only tell you what happens not why something happens.

6. Communicate Results
It is very important to share your results with others.
You may give a presentation, write a paper, or create a website.
This allows others to test or change your experiment.

7. Technology
Is the application of knowledge, tools and materials to solve problems and accomplish tasks.
What are some examples of technology that we use today?

8. Quiz # 2 1. Physical Science is the study of Matter & Motion
Matter & Energy
Energy & Motion
Matter & Composition
2. For a hypothesis to be valid, it must be
Testable
Supported by evidence
Made into a law
Both a & b

9. Quiz continued…
3. The statement “Sheila has a stain on her shirt” is an example of a(n)
Law
Hypothesis
Observation
Prediction
4. A hypothesis is often developed out of
Observations
Experiments
Laws
Both (a) & (b)

10. Quiz continued…
5. Explain why the results of one experiment are never really final results.

11. International System of Units
Today most scientists in almost all countries use the international system of units or SI.
The system is based on the number 10 which makes conversions from one unit to another easy to do.
Why do we use SI?

12. The distance from one point to another point.
Length
The distance from one point to another point.
Base unit is the meter (m).
Tool is the metric ruler

13. Meter kilometer (km) = 1,000 m decimeter (dm) = 0.1 m
centimeter (cm) = 0.01m
millimeter (mm) = 0.001m
micrometer ( ) = m
nanometer (nm) = m
1 kilometer = 1,000 meters

14. Measure this… 1. How many centimeters is your desk? _____
2. How many meters is the back counter?____
3. How many millimeters is your pencil? _____
4. How many kilometers is 1 meter? ______

15. The amount of space a substance occupies.
Volume
The amount of space a substance occupies.
Base unit is the liter (L).
Tools: metric ruler for regular solids or graduated cylinder for liquids.

16. Cubic Meter Cubic meter (m³)
Cubic centimeter (cm³) 1 cm³ = m³
Liter (L) 1L =dm³ = 0.001m³
Mililiter (mL) 1 mL= L =1 cm³

17. The amount of matter in a substance.
Mass
The amount of matter in a substance.
Base unit - kilogram (kg).
Gram (g) 1 g = kg
Milligram (mg) 1 mg = kg

18. The amount of kinetic energy a substance has.
Temperature
The amount of kinetic energy a substance has.
SI unit is the Kelvin (K).
Celsius (°C)
0°C = 273 K
100 °C = 373 K
Tool is the thermometer

19. The number of square units inside a figure
Area
The number of square units inside a figure
A = LW
Area = Length x Width
You use area to figure out how much flooring you would need inside your house.

20. Density
Density is a comparison of how much matter there is in a certain amount of space.

21. Which one is more dense? Demonstration: People in a square
How about this: Which square is more dense?

22. Which one is more dense?
Now which one is more dense?

23. What is density? Density = mass OR mass ÷ volume. volume
Units for density: g
cm3
ALWAYS REMEMBER UNITS!

24. Let’s try a density problem together
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density?
9/3 = 3 g/cm cubed
3/1 = 3 g/cm cubed