Scientific Method - Controls and Variables

Scientific Method - Controls and Variables - Scientific...

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Unformatted text preview: Scientific Method ­ Controls and Variables 1 Scientific Experiments Follow Scientific Rules. Rules • An experimenter changes one factor and observes or measures what happens. 2 The Control Variable • The experimenter makes a The special effort to keep other factors constant so that they factors will not effect the outcome. will • Those factors are called control variables. control 3 What is the Purpose of a What Control? Control? • Controls are NOT b e ing te s te d • Controls are used for COMPARISON 4 Other Variables • The factor that is changed is known as the independent variable. • The factor that is measured or observed is called the dependent variable. 5 Example of Controls & Example Variables Variables • For example, suppose you want to figure out the fastest route to walk home from school. You will try several different routes and time how long it takes you to get home by each one. • Since you are only interested in finding a route that is fastest for you, you will do the walking yourself. 6 What are the Variables in What Your Experiment? Your • Varying the route is the Varying independent variable independent • The time it takes is the dependent The variable variable • Keeping the same walker Keeping throughout makes the walker a control variable. control 7 One more thing… it is best to make several trials with each independent variable. 8 9 ...
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