Copied from another. Live Class.

1. What is a Variable?

2. DEFINITION
Variable – Any factor that
can change in a scientific
investigation or
experiment

3. Types of Variables
Independent Variable
The condition that is intentionally
changed by the investigator in an
experiment
There can be only one independent
variable in an experiment

4. Dependent Variable
 The factors or conditions that will change
as a result of the independent variable
The factors that you measure or observe as
data
There can be one or more dependent
variables in an experiment
Types of Variables

5. Controlled Variables
The factors or conditions that are
kept the same (unchanged) in an
experiment.
There are many controlled variables
in an experiment
Types of Variables

6. Identify variables for the
following experiments.
You can do it!
Practice

7. • Does changing the temperature
of a ball affect the height the
ball will bounce?
Testable Question #1
HotCold

8. Manipulated
Variable
Responding
Variable
Identify Variables #1
Cold Hot
• Does changing the temperature
of a ball affect the height the ball
will bounce?

9. • Controlled Variables:
* Same ball
* Dropped from the same height
* Dropped onto the same surface
* etc…
Identify Variables #1

10. • Does changing the color of light
affect the growth rate of plants?
Testable Question #2

11. Manipulated
Variable
Responding
Variable
Identify Variables #2
• Does changing the color of light
affect the growth rate of plants?

12. • Controlled Variables:
* Same type / size of plant
* Same wattage of bulb
* Same amount of water
* Same soil
* Light on for the same amount of
time
* etc…
Identify Variables #2

13. • How does the size of a parachute
affect the time it takes a
hippo to fall 10 feet?
Testable Question #3

14. Manipulated
Variable
Responding
Variable
Identify Variables #3
• How does the size of a parachute
affect the time it takes a hippo to
fall 10 feet?

15. • Controlled Variables:
* Same hippo
* Dropped from the same height
* Same parachute fabric
* Same length of strings on the parachute
* etc…
Identify Variables #3