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Variable PRACTICE

Explore the essential concepts of scientific variables in experiments with clear definitions and examples. This guide covers three main types of variables: Manipulated Variables (MV), which are the changes made by the scientist; Responding Variables (RV), which are the observed and measured effects; and Controlled Variables (CV), which remain constant to ensure fair tests. Practical examples illustrate these concepts, such as jigsaw puzzles and electromagnetic systems. Understanding these variables is crucial for designing reliable experiments and accurately analyzing data. ###

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Variable PRACTICE

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  1. VariablePRACTICE

  2. 3 Kinds of Variables • 1. Manipulated Variable (MV) • something that is changed by the scientist • What is tested, what is manipulated

  3. 2. Responding Variable (RV) • something that might be affected by the change in the MV (you have no control over it) • what is observed and measured • the data collected during the investigation

  4. 3. Controlled Variables (CV) • variables that are not changed • allow for a “fair test”

  5. Some Experiments will also have…. Experimental Control (EC) • used as a comparison • “normal conditions” • Not all experiments will have an EC

  6. Let’s PRACTICE!!!

  7. Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.

  8. Identify the variables in this investigation. • MV • RV • Controlled Variable (CV)

  9. MV: ages of the students • RV: the time it to put the puzzle together • CV: same puzzle

  10. Another example:

  11. An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured.

  12. What are the variables in this investigation? • MV: sizes of nails • RV: number of paper clips picked up • CV: battery, wire, type of nail

  13. One more:

  14. The higher the temperature of water, the faster an egg will boil.

  15. What are the variables in this investigation? • MV: temperature of water • RV: time to cook an egg • CV: type of egg

  16. Last one:

  17. The temperature of water was measured at different depths of a pond.

  18. What are the variables in this investigation? • MV: depth of the water • RV: temperature • CV: thermometer

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