does changing the color of light affect the growth rate of

1
What is a Variable?
2
Types of Variables

• Manipulated Variable
• The condition that will be changed in an
  experiment.

3
Types of Variables

• Responding Variable
• The condition that will be measured in an
  experiment.

4
Types of Variables

• Controlled Variables
• The conditions that are kept the same
  (unchanged) in an experiment.

5
Practice

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

6
Testable Question 1

• Does changing the temperature of a ball affect
  the height the ball will bounce?

Hot
Cold
7
Identify Variables 1

• Does changing the temperature of a ball affect
  the height the ball will bounce?

Cold
Hot
8
Identify Variables 1

• Controlled Variables
• Same ball
• Dropped from the same height
• Dropped onto the same surface
• etc

9
Testable Question 2

• Does changing the color of light affect the
  growth rate of plants?

10
Identify Variables 2

• Does changing the color of light affect the
  growth rate of plants?

11
Identify Variables 2

• 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

12
Testable Question 3

• How does the size of a parachute affect the time
  it takes a toy
• hippo to fall 10 feet?

13
Identify Variables 3

• How does the size of a parachute affect the time
  it takes a toy hippo to fall 10 feet?

14
Identify Variables 3

• Controlled Variables
• Same hippo
• Dropped from the same height
• Same parachute fabric
• Same length of strings on the parachute
• etc