1. Introduction to physical science
Mr. Hodesblatt

2. How do scientists explore the world?
Key ideas
How do scientists explore the world?
How are many types of science organized?
How are theories different than laws?

3. How science takes place?
investigating
Build on past works
Eg cathode rays
Scientists have found cathodes pass through metal foil about 2cm-3cm
But wont go through glass
You think that if you cover glass with black paper you will be able to see it glow
Plan experiments
Write a detailed experiment and sketch out your process
Carefully record everything
State hypothesis
Observe
Observe results
Say you observe the cathodes moving from 1m away
What do you do?
This was a real scenario faced by Wilhelm Roentgen in 1895
Confirm results
He repeated the experiment
Found that they passed through everything but very dense materials
Nowadays we call them X-Rays
Won a Nobel prize for his discovery

4. Branches of science Transparency 1 All branches work together
Eg chemistry is applied physics
Organic chem is applied chemistry
Biology is applied organic chemisty
Science and technology work together
Do experiments to learn more about the world
Can use technology
Can develop technology to help with research

5. Law vs. Theory Law Theory
Describes a process in nature that can be used to repeat experiments
Allows predictions to be made about how a system will behave
Eg mathematical formulas
Does NOT explain HOW something happens
Explanation of how a natural process works
Must explain observations
Must be able to predict results

6. We use science in our every day lives
Computer models
Used to forecast weather
Eg hurricanes
Math can describe real events
Models can represent physical events
Theories and laws are always being tested

7. KEY IDEAS
1. Compare the two branches of physical science.
2. Explain how science and technology depend on
each other and how they differ from each other.
3. Define scientific law, and give an example.
4. Compare a scientific law and a scientific theory.
5. Explain why a scientific theory might be changed.
6. Describe how a scientific model is used, and give
an example of a scientific model.

8. CRITICAL THINKING
7. Applying Ideas How may Roentgen’s training as a
scientist have affected the way that he responded to
his discovery?
8. Analyzing Ideas Explain how a scientific theory differs
from a guess or an opinion.
9. Forming Hypotheses Pick a common occurrence,
develop an explanation for it, and describe an
experiment tha