Basic variables ppt

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Variables: Independent, Dependent, Controls.

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Basic variables ppt

  1. 1. What is a Variable?
  2. 2. DEFINITION <ul><li>Variable – Any factor that can change in a scientific investigation or experiment </li></ul>
  3. 3. Types of Variables <ul><li>Independent Variable </li></ul><ul><li>(also called the manipulated variable) </li></ul><ul><li>The condition that is intentionally changed by the investigator in an experiment </li></ul><ul><li>There can be only one independent variable in an experiment </li></ul>
  4. 4. <ul><li>Dependent Variable </li></ul><ul><li>(also called the responding variable) </li></ul><ul><li>The factors or conditions that will change as a result of the independent variable </li></ul><ul><li>The factors that you measure or observe as data </li></ul><ul><li>There can be one or more dependent variables in an experiment </li></ul>Types of Variables
  5. 5. <ul><li>Controlled Variables </li></ul><ul><li>The factors or conditions that are kept the same (unchanged) in an experiment. </li></ul><ul><li>There are many controlled variables in an experiment </li></ul>Types of Variables
  6. 6. <ul><li>Identify variables for the following experiments. </li></ul><ul><li>You can do it! </li></ul>Practice
  7. 7. <ul><li>Does changing the temperature of a ball affect the height the ball will bounce? </li></ul>Testable Question #1 Hot Cold
  8. 8. Identify Variables #1 <ul><li>Does changing the temperature of a ball affect the height the ball will bounce? </li></ul>Cold Hot Manipulated Variable Responding Variable
  9. 9. <ul><li>Controlled Variables: </li></ul><ul><li>* Same ball </li></ul><ul><li>* Dropped from the same height </li></ul><ul><li>* Dropped onto the same surface </li></ul><ul><li>* etc… </li></ul>Identify Variables #1
  10. 10. <ul><li>Does changing the color of light affect the growth rate of plants? </li></ul>Testable Question #2
  11. 11. Identify Variables #2 <ul><li>Does changing the color of light affect the growth rate of plants? </li></ul>Manipulated Variable Responding Variable
  12. 12. <ul><li>Controlled Variables: </li></ul><ul><li>* Same type / size of plant </li></ul><ul><li>* Same wattage of bulb </li></ul><ul><li>* Same amount of water </li></ul><ul><li>* Same soil </li></ul><ul><li>* Light on for the same amount of </li></ul><ul><li> time </li></ul><ul><li>* etc… </li></ul>Identify Variables #2
  13. 13. <ul><li>How does the size of a parachute affect the time it takes a </li></ul><ul><li>hippo to fall 10 feet? </li></ul>Testable Question #3
  14. 14. Identify Variables #3 <ul><li>How does the size of a parachute affect the time it takes a hippo to fall 10 feet? </li></ul>Manipulated Variable Responding Variable
  15. 15. <ul><li>Controlled Variables: </li></ul><ul><li>* Same hippo </li></ul><ul><li>* Dropped from the same height </li></ul><ul><li>* Same parachute fabric </li></ul><ul><li>* Same length of strings on the parachute </li></ul><ul><li>* etc… </li></ul>Identify Variables #3

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