Variables -Approaching – 02

What is the control variable? The control variables used for this experiment will be the variables you keep the same. For example, you will use the same car, the same type of track, and the same length of track. This matters because if different cars are tested, it might accidently become its own independent variable. This could affect the dependent variable (the speed) of our experiment. How? Not every car works the same way. We need the same car every time. We will only change one variable, the independent variable. Our control variables must stay the same. 

In summary, there are two kinds of variables: independent and dependent. The dependent variable is the outcome variable. This is what we measure after doing the experiment. The independent variable is the one you will change. There can be more than one potential independent variable. Only one can be changed at any given time. The rest need to remain constant. If you tried to investigate something by changing two variables at a time, you would have no way to tell which one affected the dependent variable.