1. Welcome to Physical Science1

2. Ch 1-Science skills Science vs Technology
SCIENCE= system of knowledge & the methods you use to find knowledge
TECHNOLOGY= the application of scientific knowledge to improve the quality of life
Which came first-science or technology? 2

3. What is Physical Science?
PHYSICS= study of matter & energy & the interactions between the two through forces & motion 3

4. CHEMISTRY= study of the composition (what matter is made up of), structure, properties (what matter is like & how it behaves), & reactions of matter

5. SCIENTIFIC THEORY versus SCIENTIFIC LAW
Theory=an Explanation based on many observations supported by experimental results (explains why things work the way that they do) 5

6. SCIENTIFIC THEORY versus SCIENTIFIC LAW
Law=“rule of nature” Evidence summed up by related observations & experimental results to describe a pattern found in nature. 6

7. What is the SCIENTIFIC METHOD?
an organized plan for gathering, organizing, & communicating information 7

8. STEPS 1) OBSERVATION= using senses to gather info
2) PROBLEM= what do you want to know?
3) HYPOTHESIS= educated guess
4) EXPERIMENT= way to test hypothesis 8

9. STEPS in the experiment
Manipulated variable (Independent)= causes a change in another
Responding variable (Dependent)= the variable that changes in response to the manipulated variable 9

10. STEPS in the experiment
Controlled Experiment= a standard for comparison, hold a variable constant (does
not change) 10

11. STEPS 5) ANAYLZE DATA= in words, charts, &/or graphs
6) CONCLUSION= Accept or Reject hypothesis, what you learn/discover 11

12. Analyze Data w/ Graphs Graph= a visual display of info
Pie Graphs= shows how some fixed quantities are broken down into parts *must equal 100%
Bar Graphs= show info collected by counting 12

13. Analyze Data w/ Graphs Line Graphs= shows changes occurring over time
Direct proportion= ratio of 2 variables is constant, both increase or decrease
Inverse (Indirect) proportion= as one variable increases the other decreases, vice versa 13

14. Graphs 14

15. Identify the- 1. Control Group 2. Independent Variable
Bart believes that mice exposed to microwaves will become extra strong. He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found that 8 out of 10 of the microwaved mice were able to push the block away. 7 out of 10 of the non-microwaved mice were able to do the same.
Identify the- 1. Control Group
2. Independent Variable
3. Dependent Variable
4. What should Bart's conclusion be?
5. How could Bart's experiment be improved? 15

16. GUESS G= Given, identify the given information
U= Unknown, identify the unknown, what are you trying to solve for?
E= Equation, what equation should you use to solve the problem?
S= Substitute the numbers in for the letters in the equation
S= Solve, plug in the calculator, chug get
an answer….don’t forget the units! 16