1. Science In Our World
Chapter 1

2. Science
Knowledge obtained by observing the natural world in order to discover facts
Observe
Get the Facts
Test Ideas
Formulate Laws
Science begins by …
asking a question.
Why is the sky blue?

3. Why is the sky blue?
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.
Remember light is a mixture of all colors of the rainbow.

4. When a question is asked…
How can you find the answer?
Research
(Encyclopedias, Internet, Experts)
Observation
(Go to the source, watch carefully)
Experimentation
(Test your ideas)

12. Models Physical (3D) Mathematical Conceptual Volcanoes, Skyscraper
(Graphical---Maps/Charts)
Equations, numbers
Classification of animal behaviors

18. AFDAC = Scientific Method
A sk a question
F orm a hypothesis
D esign an experiment
A nalyze the Results
C onclude

21. Scientific Knowledge (Theories/Laws)
Theories are used to explain observations and predict what may happen
Theory: explanation that ties together many related observations, facts, and tested hypotheses
What happens when a theory and its models correctly predict the results of many experiments?
Law: summary of many experimental results and observations, tells how things work

25. Hypothesis vs. Theory vs. Law
Hypothesis = Educated Guess
Theory = Possible explanation through tested hypothesis
Law = Proven……… for now

28. Peer Review
Experts in a given field examine the results and conclusions of an experiment before it can be accepted for publication

29. Measurement and Tools Stopwatch = Time Graduated Cylinder = Volume
Thermometer = Temperature
Triple Beam Balance = Mass
Spring Scale = Weight
Meter Stick = Distance

31. Measurement and Units Time = seconds Volume = ml or cm3
Temperature = degrees°
Mass = grams