Basic variables ppt
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Basic variables ppt

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Variables: Independent, Dependent, Controls.

Variables: Independent, Dependent, Controls.

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Basic variables ppt Basic variables ppt Presentation Transcript

  • What is a Variable?
  • DEFINITION
    • Variable – Any factor that can change in a scientific investigation or experiment
  • Types of Variables
    • Independent Variable
    • (also called the manipulated variable)
    • The condition that is intentionally changed by the investigator in an experiment
    • There can be only one independent variable in an experiment
    • Dependent Variable
    • (also called the responding 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
    • 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
    • Identify variables for the following experiments.
    • You can do it!
    Practice
    • Does changing the temperature of a ball affect the height the ball will bounce?
    Testable Question #1 Hot Cold
  • Identify Variables #1
    • Does changing the temperature of a ball affect the height the ball will bounce?
    Cold Hot Manipulated Variable Responding Variable
    • Controlled Variables:
    • * Same ball
    • * Dropped from the same height
    • * Dropped onto the same surface
    • * etc…
    Identify Variables #1
    • Does changing the color of light affect the growth rate of plants?
    Testable Question #2
  • Identify Variables #2
    • Does changing the color of light affect the growth rate of plants?
    Manipulated Variable Responding Variable
    • 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
    • How does the size of a parachute affect the time it takes a
    • hippo to fall 10 feet?
    Testable Question #3
  • Identify Variables #3
    • How does the size of a parachute affect the time it takes a hippo to fall 10 feet?
    Manipulated Variable Responding Variable
    • Controlled Variables:
    • * Same hippo
    • * Dropped from the same height
    • * Same parachute fabric
    • * Same length of strings on the parachute
    • * etc…
    Identify Variables #3