1. Why is it important to change only one variable at a time?
Bell work
Update your planner
Turn in variables worksheet (from Friday)
Take “Bell Work” paper from front table
In the first section (date 9/7) write “Labor Day-No school”
In the next section (date 9/8), write and answer the question below
Why is it important to change only one variable at a time?

2. Pendulum investigation
Mrs. Bauer- Nature of Science

3. What is a pendulum?
Pendulum- A weight hung from a fixed point so that it can swing freely backwards and forwards.

4. Parts of a pendulum Angle Length of Pendulum String
Weight of Pendulum Bob

5. What is a variable?
Variable- Any factor that can be controlled, changed, or measured in an experiment
Independent Variable
Dependent Variable
Controlled Variables/ Control group

6. Is there only one way to do science?
Experimental investigation
Systematic Investigation
Descriptive
Comparative

7. Experimental investigation
An organized scientific investigation that includes a control group and is designed to test the hypothesis.
Only attempts to change ONE variable at a time!

8. Descriptive investigation
An investigations in which scientific questions are investigated and observations are recorded and catalogued.
Examples??
A student used a microscope to observe an amoeba to determine how the organism moved.

9. Comparative investigation
An investigation where observations are made that compare two objects or phenomena.
Examples??
A student used a hand lens to examine the color and texture of four different rocks.

10. Simulation

11. Pendulums everyday!
Examples??