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The variables
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Hi students, today we will be conducting an experiment using dependent, independent and control variables.
We love experiments!
I learned last year that independent variables are ones that you are testing. They do not change.
Before we begin, we need to understand what variables are and why they are important.
...and I learned that dependent variables are the results of the experiment. They depend on the independent variable.
Lisa and Arnold, you are both correct. Do either of you know what a control variable is?
Yes Mr. Roberts, control variables are all of the other variables that are kept constant. They do not change throughout the experiment.
Perfect. It is important to have the 3 types of variables for fair experiments. Do you know why?
Yes Mr. Roberts, You can conduct a fair test by ensuring you only change one factor at a time and keeping all other factors the same.
Exactly! Lets see how we can put our learning to the test. I have a wonderful experiment using 3 balls and a ramp to show you.
Are the three balls all the same type of ball, but just different sizes, Mr. Roberts?
Yes, Arnold, that makes the size of the ball our independent variable. What would our dependent variable be?
I think the dependent variable will be how far the ball rolls. Will they be rolling off of a ramp?
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