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Scientific Method

Scientific Method






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    Scientific Method Scientific Method Presentation Transcript

    • Scientific Method
    • Scientific Method
      • It is the TOOL scientists use to find the answer to their questions.
      • It is a step-by-step process.
    • ScientificMethod
      • Step 1: Choose a Problem
      • What are you trying to find out?
      • Does eating breakfast affect school performance?
      • Does mold need light to grow?
      • This is your BIG QUESTION!!!
      It has to be something you can test!
    • Step 2: Research
      • In order to set up your experiment properly, you must know something about the topic you will be experimenting with .
      • Otherwise you might not know that mold grows best in moist conditions.
      • Good places to start are: the library, encyclopedias, and the Internet.
    • Step 3:Make a hypothesis. After you have researched your topic, you can form a hypothesis about it.
    • Hypothesis
      • The hypothesis is what you think will happen.
      • It is your idea about the solution to the problem you have chosen.
      • For example, “I think that bread mold can grow where there is no light.”
    • Step 4: Procedure
      • Before you conduct your experiment to test your hypothesis, you must plan out how you will do your experiment .
      • Plan the experiment, step by step .
      • For example:
      • First I will take two pieces of bread from the same loaf.
      • Second, I will place each of them in a ziploc bag.
      • Then I will put 5 drops of water on each.
      • Next, I will place one bag in a dark cabinet and the other on the window sill.
      • I will look at the bread, each day at 3:30 and observe any changes.
      • I will draw how the bread looks at each observation on my observation chart.
      • After the 14 th day, I will make a conclusion based on my findings
      • There are three other things that you must know about when setting up your experiment:
    • Control A control is a part of the experiment that is used to compare your results to . For example: The control could be a piece of bread that is just left in a ziploc bag in the room (not in a window or dark cabinet, no drops of water added).
    • Variable
      • The variable in an experiment is the part of the experiment that is being manipulated; that changes.
      • For example: In our experiment, the amount of light the bread was exposed to was the variable.
      • Your experiment will only have one variable. If you have too many variables, you will not know which one caused your experiment’s results.
    • Controlled Variable
      • A controlled variable is very important to your experiment.
      • It is the part of the experiment that is not affected by the variable being tested . It must be constant (or remain the same) or you cannot tell if your experiment worked .
      • For example: I used the same type of bread, and the same amount of water was added to each.
    • Step 5: Results
      • After conducting your experiment, analyze your results . This is sometimes called “Analysis”.
      • For example: I noticed that the bread in the dark conditions had more mold throughout the experiment. The one in the window had some mold, but not as much.
    • This analysis of your data will help you come to your… Conclusion (Step 6) Your conclusion is what you have decided based on your experiment . Your conclusion states whether or not your hypothesis was right .
    • For example: “ Because the bread in the dark cabinet grew a lot of mold, my hypothesis that mold does not need light to grow is correct.” Remember: Just because your hypothesis was incorrect, does not mean that you have made a mistake . It actually means that you conducted an objective, scientific investigation. Congratulations! You just learned something new and probably taught someone else something new.
    • Let’s review…
      • Identify a problem: Your big question – What are you trying to find out?
      • Research your topic.
      • Formulate a hypothesis: What do you think will happen?
      • Procedure: Plan your experiment, step-by-step.
      • Results: Analyze your data.
      • Conclusion: Was your hypothesis correct?