1. Scientific Method and Measurement
Ms. Mezzetti
Biology
Lynn English High School

2. Scientific Method 2 3 1 5 4 6 7

3. How do we use the scientific method in everyday life?
Solve problems-Who? What? When?
Decide which products are best
Make informed decisions using collected data/ideas/information
School work
Research

4. Scientific Method
The word science is derived from a Latin verb meaning “to know”.
The scientific method is used to solve problems in science and in everyday life
Can you give an example of how you have used the scientific method?

5. Steps of the scientific method
Make an observation: Using our 5 senses we make observations
Ask questions: Based on an observation we ask questions as to what we would like to know
Collect Data: Before we can form a hypothesis, we need to collect some information.

6. Scientific Method
Make a hypothesis: Using our observations and collected data a hypothesis is usually an “if..then” testable statement of what we think is true
Experiment: Used to test the hypothesis and prove it correct or incorrect.

7. Experiment
A controlled experiment has a control group which stays the same and an experimental group where one factor is changed-known as the independent variable
The factor that is being measured is known as the dependent variable

8. Analyze results
Analyze: Do the results/data from the experiment support the hypothesis
Data can be models, graphs or tables. It can be qualitative-color change; quantitative which is numbers

9. Drawing conclusions
Draw conclusions: Is the hypothesis correct? . If not, you need to go back and revise the hypothesis and experiment again.
Communicate results: After many trials with repeated results, it is important to communicate results. There must be many trials before a theory (thought to be true) or law(fact based on repeated experimentation) can be stated.

10. Scientific Measurement
Scientists use Systèm International d’Unités (Internal System of Measurements), commonly called SI.
This allows scientists to have a universal way to communicate their results

11. The Seven Fundamental Base Units
1. Meter (m) – length
2. Kilogram (kg) – mass
3. Second (s) – time
4. Ampere (A) – electric current
5. Kelvin (K) – thermodynamic temperature
6. Mole (mol) – amount of substance
7. Candela (cd) – luminous intensity

12. The Metric System The metric system uses the same prefixes.
Common prefixes are:
kilo = 1000
centi = 1/100th
milli = 1/1000th
1 meter = 100 centimeters= 1000 millimeters

13. Derived Units