Variables What types of variables effect an experiment? How can you identify each type of variable?...
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Transcript of Variables What types of variables effect an experiment? How can you identify each type of variable?...
![Page 1: Variables What types of variables effect an experiment? How can you identify each type of variable? Essential questions:](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649d945503460f94a7bd67/html5/thumbnails/1.jpg)
VariablesVariables
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• What types of variables effect an experiment?
• How can you identify each type of variable?
Essential questions:
![Page 3: Variables What types of variables effect an experiment? How can you identify each type of variable? Essential questions:](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649d945503460f94a7bd67/html5/thumbnails/3.jpg)
Variables
Variables: things that change
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Variables
In any experiment there are 3 variables:
an independent (or input) variable
a dependent (or outcome) variable
some control variables
Let’s look at each type….
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Variables
Independent variable: The thing you decide to change.
Example 1
You decide the weight to apply, so:
Weight is the independent variable.
Investigating how a weight affects the length of an elastic band.
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Variables
Dependent Variable: the variable that changes as a result of changing the independent variable.
This is the variable you measure
Example 1
You measure the resulting length of the elastic band, so:
Length is the dependent variable.
Investigating how a weight affects the length of an elastic band.
![Page 7: Variables What types of variables effect an experiment? How can you identify each type of variable? Essential questions:](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649d945503460f94a7bd67/html5/thumbnails/7.jpg)
Variables
Controls: These are all the variables that must not change, to make sure it is a fair test.
Example 1
You must use the same elastic band all the time, and the same scale etc,so it is a fair test.
Investigating how a weight affects the length of an elastic band.
![Page 8: Variables What types of variables effect an experiment? How can you identify each type of variable? Essential questions:](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649d945503460f94a7bd67/html5/thumbnails/8.jpg)
![Page 9: Variables What types of variables effect an experiment? How can you identify each type of variable? Essential questions:](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649d945503460f94a7bd67/html5/thumbnails/9.jpg)
Variables
Example Experiment:
How does the starting temperature of a beaker of water affect the time the beaker will take to cool down?
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Example:
Imagining this experiment, write down the : Independent variable:
Dependent variable:
Control variables
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Example
Remember, the dependent variable is what changes as a result of your experiment, it’s the variable you measure, so…
You measure TIME, so:
Time the beaker takes to cool down is the dependent variable.
Question: How does the starting temperature of a beaker of water affect the time the beaker will take to cool down?
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Example
Remember, the independent variable is what YOU change, so…
You change the starting temperature, so:
STARTING TEMP is the independent variable.
Question: How does the starting temperature of a beaker of water affect the time the beaker will take to cool down?
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Example
Remember, the control variables are all the variables that must not change, to make sure it is a fair test.
You must use the same beaker, with the same amount of water, in the same position in the room, at the same room temperature,so it is a fair test.
Question: How does the starting temperature of a beaker of water affect the time the beaker will take to cool down?
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Example:
Imagining this experiment, write down the : Independent variable:
Starting temperature
Dependent variable:
Time to cool
Control variables
Same beaker, amount of water, room temp
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When you draw up a table of your results,
the independent variable goes in the first column, like this:
Tables
If you take several readings of the dependent variable, then you can calculate the mean (average)Then your results will be more reliable.
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Groups
The experimental group: the group in a scientific experiment where the experimental procedure is performed
The control group is a group that does NOT get the experimental procedure.