control & variable notes
DESCRIPTION
Control & Variable Notes. Where do I start?. After you have a question that you want to answer using the scientific method, there are a few important things you need to think about while setting up your experiment. Example Question #1:. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/1.jpg)
Control & Variable Notes
![Page 2: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/2.jpg)
Where do I start?
• After you have a question that you want to answer using the scientific method, there are a few important things you need to think about while setting up your experiment.
![Page 3: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/3.jpg)
Example Question #1:
• Does heating a cup of water allow it to dissolve sugar faster?
![Page 4: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/4.jpg)
THE CONTROL
• A control is the part of the experiment that remains the same.
• It may also be called the constant.
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How to Remember:
• WHAT I KEEP THE SAME
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Back to the Example
• Question #1: Does heating a cup of water allow it to dissolve sugar faster?
• Control #1: Type of water, Type of sugar, amount of water…
![Page 7: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/7.jpg)
CONTROL GROUP
• The control group provides a baseline for comparison.
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HOW TO REMEMBER:
• LEAVE OUT WHAT YOU ARE TESTING
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Back to the Example:
• Question #1: Does heating a cup of water allow it to dissolve sugar faster?
• Control #1: Type of water, Type of sugar, amount of water…
• Control Group #1: Room temperature water
![Page 10: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/10.jpg)
What is a Variable?
• A variable is the part of the experiment that changes. An experiment usually has two kinds of variables: independent and dependent.
![Page 11: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/11.jpg)
INDEPENDENT VARIABLE
• The variable that is changed by the scientist.
• To insure a fair test, a good experiment has only ONE independent variable. As the scientist changes the independent variable, he or she observes what happens.
![Page 12: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/12.jpg)
HOW TO REMEMBER:
• WHAT I CHANGE
![Page 13: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/13.jpg)
Back to the Example
• Question #1: Does heating a cup of water allow it to dissolve sugar faster?
• Control #1: Type of water, Type of sugar, amount of water…
• Control Group #1: Room temperature water
• I.V. #1 : Temperature of the water
![Page 14: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/14.jpg)
DEPENDENT VARIABLE
• The variable that is caused by the change the scientist made.
• The scientist focuses his or her observations on the dependent variable to see how it responds to the change made to the independent variable.
![Page 15: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/15.jpg)
HOW TO REMEMBER:
• WHAT I OBSERVE
![Page 16: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/16.jpg)
Back to the Example
• Question #1: Does heating a cup of water allow it to dissolve sugar faster?
• Control #1: Type of water, Type of sugar, amount of water…
• Control Group #1: Room temperature water
• I.V. #1 : Temperature of the water• D.V. #1: How fast sugar dissolves
![Page 17: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/17.jpg)
Example #2:
• Question #2: Does fertilizer make a plant grow bigger?
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Example #2:
• Control(s): size of plant size of pot amount of soil type of soil amount of water
![Page 19: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/19.jpg)
Example #2:
• Control Group:
A plant with no fertilizer
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Example #2:
• Independent Variable (What I Change):
Amount of fertilizer
![Page 21: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/21.jpg)
Example #2:
• Dependent Variable (What I Observe):
Height of plant
![Page 22: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/22.jpg)
Example #3:
• Question #3: What type of dish soap best removes spaghetti sauce stains from plates?
![Page 23: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/23.jpg)
Example #3:
• Control(s):
amount of sauce
type of plate
amount of dish soap
![Page 24: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/24.jpg)
Example #3:
• Control Group:
Using just water to wash
![Page 25: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/25.jpg)
Example #3:
• Independent Variable (What I Change):
type of dish soap
![Page 26: Control & Variable Notes](https://reader035.vdocuments.us/reader035/viewer/2022062500/56815018550346895dbdfe4b/html5/thumbnails/26.jpg)
Example #3:
• Dependent Variable (What I Observe):
Amount of sauce stain leftover.