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?

Pendulum investigation Mrs. Bauer- Nature of Science

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

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

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

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

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!

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.

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.

Simulation http://phet.colorado.edu/en/simulation/pendulum-lab

Pendulums everyday! Examples??