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# Scientific Method - PowerPoint PPT Presentation

Scientific Method. Bellringer. This car will not start. 1.What are some possible reasons the car will not start? 2.How would you test your guesses?. Scientific Method. 1. Observation: Notice there is a problem or question to be answered 2. Hypothesis: Scientific Explanation

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## PowerPoint Slideshow about 'Scientific Method' - teigra

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### Scientific Method

• This car will not start

1.What are some possible reasons the car will not start?

2.How would you test your guesses?

• 1. Observation: Notice there is a problem or question to be answered

• 2. Hypothesis: Scientific Explanation

• 3. Experiment: Test your hypothesis

• 4. Data: Collect information

• -5. Analyze Data

• 6. Modify if needed or Communicate Results

• Control: used to compare experimental results. Does not receive any experimental treatment/changes

• Variable: Factor changed during experiment

• Independent Variable: What is changed. Will affect the outcome of the experiment

• Dependent Variable: Results of the experiment

• Qualitative Data: Express with Numbers

• -Quantitative Data: Express with Descriptions

• Display in graphs: Bar, Line, Circle

• X axis: Independent Variable

• Y axis: Dependent Variable

• 1. If results are consistent with hypothesis, communicate and publish results.

• 2. If results are not consistent with hypothesis, modify experiment.

• 1. Experiment must be repeatable.

• 2. Theory versus Law

• -Theory is subject to change as more knowledge is gained. “Theory of Evolution”

• -Laws are universally accepted to be true. “Law of Gravity”

Scientific Method in everyday

• Car will not start =____________

• Out of gas? = _________________

• Adding gas and seeing if car starts = ___________________________

• Car doesn’t start = _____________

• It wasn’t out of gas = _____________________________ (disproves hypothesis this time)

Tada! The Five Steps of the Scientific Method

Scientific Method in everyday

• Car will not start =Observation

• Out of gas? = Hypothesis

• Adding gas and seeing if car starts = Experiment

• Car doesn’t start = Data/Results

• It wasn’t out of gas =Conclusion/ Revise (disproves hypothesis this time)

Partner Work: Write a hypothesis for each of the following research problems. Identify the dependent and independent variable for each.

• 1. What effect does high temperature have on onion growth rates?

• 2. What effect does light have on plant growth?

• 3. What effect do different mouthwashes have on bad breath?

• 4. What effect does light have on plant growth?