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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