:: How to perform your experiment
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About science fairsHere's an example you might already know about: In the past, some scientists thought that the planets in our galaxy all went around Earth. But through the scientific method, they found out that the planets actually orbit around the sun in circles. Later on, they found out that the planets don't orbit in perfect circles, but in oval shapes called ellipses.
Now that you have a question and a hypothesis, the next step in the scientific method is to design an experiment to see if the hypothesis is correct. If the experiment supports the hypothesis, the hypothesis becomes a scientific theory. But if the experiment doesn't support the hypothesis, we have to either change or reject it.
Now it's your turn to apply the independent, dependent, and control variables in your own experiment. The independent variable is the thing that you will change on purpose to see how it affects the dependent variable. The dependent variable is the thing that you will measure to see how it changes because of the independent variable. The control variables are all the other things that you will keep the same in your experiment. By making sure that all the control variables stay the same, you can be sure that any changes in the dependent variable are due to the independent variable. Remember, it's important to carefully control the variables in your experiment so you can be sure that your results are accurate and reliable.