Scientific Method
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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?