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Identifying Variables in Science

Identifying Variables in Science. Objective. Identify the types of variables in a science experiment Independent Dependent Control variables. 3 Types of Variables. Independent Variable – something that is changed by the scientist What “I” change Only 1 thing can be changed

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Identifying Variables in Science

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  1. Identifying Variables in Science

  2. Objective • Identify the types of variables in a science experiment • Independent • Dependent • Control variables

  3. 3 Types of Variables • Independent Variable – something that is changed by the scientist • What “I” change • Only 1 thing can be changed • Sometimes referred to as: the cause

  4. 3 Types of Variables • Dependent Variable – something that might be affected by the change in the independent variable • What is observed • What is measured • The result of what “I” changed • The data collected during the investigation • Sometimes referred to as: the effect

  5. 3 Types of Variables • Control Variable – a variable that is not changed • Also called constants • Keep everything else besides the independent variable the same • Allow for a “fair test”

  6. Relating to Math 2 + ____= ? What does this problem equal?

  7. Relating to Math • 2 + 2 = 4 • 2 + 4 = 6 • 2 + 50 = 52 - In every example, we changed one number and it affected the answer! -Therefore, the answer depended on the # we changed -In science, a variable is something that can be changed. -In our simple math problems, the numbers we changed are called the independent variable -A constant is something that does not change -In our math problems, the numbers we decided not to change are called constants

  8. Relate to Real Life Scenarios • “Cause and Effect” relationships • For example: • The more toppings you put on your pizza order, the more expensive your pizza is • The amount of time you spend studying affects your grade on a test

  9. Mnemonic to remember: • C (Central)- What will we change? • M (Magnet)- What will we measure? • S (School)- What will stay the same?

  10. Identify the variables in the following science investigations • A magnetic field is made from a battery and wire wrapped around a nail. Different sizes of nails were used in the experiment. The number of paper clips the magnet could pick up was measured.

  11. Question • What are the variables in the investigation? • Independent • Dependent • Control

  12. Independent Variable • Sizes of the nails • These were changed by the scientist

  13. Dependent Variable • Number of paper clips picked up • The number of paper clips observed and counted (measured)

  14. Control Variables • Battery, wire, type of nail • None of these items were changed

  15. “Group Share” assignment • With your assigned group, come up with 1 experimental design • Identify all variables: independent, dependent and control variables • Each group will share their poster • Example shown

  16. Bellwork for 8/20 • Define independent, dependent and control variables using the experiment below: • Does the temperature of a soccer ball affect the height the soccer ball will bounce?

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