Bell Work

Sept 1, 2015SPI 0807.Inq.1

(Variables and Controls)

1. Three red trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measure once a week. What is the independent, dependent, and controlled variables.

2. What equipment do you use to find mass?3. What are the units to mass?4. Find the Density if the mass of a cube is 10 g and

each side is 5cm.

SPI 0807.Inq.1(Variables and Controls)

Today's Plan

Plan

1) Explain/Discuss bellwork2) Emphasize objective(s)3) Review Variables3)Variables worksheet

You must turn the worksheet in before you leave. It will be CHECKED for a grade!!

WRITE THIS IN YOUR AGENDA!Homework: NONE

Science

In an experiment… …you should only test for ONE key thing at a time When you repeat the experiment… …only change this ONE key thing

This one thing is called…

Notes SPI 0807.Inq.1 (Variables and Controls)

Independent Variables

Notes SPI 0807.Inq.1 (Variables and Controls) Science

What Is A Dependent Variable? Often called the "responding variable" because it is the

response to the factor that was previously introduced These are the results that you observe after you introduced

the independent/manipulated variable In other words, anything that "changes on its own" while the

experimenter is observing it will be a…

Also called "Responding Variable"

Notes SPI 0807.Inq.1 (Variables and Controls) Science

What Is A Contolled Variable? In an experiment, the control variable is something that

is constant and unchanged. Further, a control variable strongly influences values; it

is held constant to test the relative impact of independent variables.

In other words, if not held constant it will affect your results and make them invalid.