Scientific Method

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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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### 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
• 3. Experiment: Test your hypothesis
• 4. Data: Collect information
• -5. Analyze Data
• 6. Modify if needed or Communicate Results
Experiment
• 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
Data
• Qualitative Data: Express with Numbers
• -Quantitative Data: Express with Descriptions
• Display in graphs: Bar, Line, Circle
• X axis: Independent Variable
• Y axis: Dependent Variable
Analyze Results
• 1. If results are consistent with hypothesis, communicate and publish results.
• 2. If results are not consistent with hypothesis, modify experiment.
Conclusion
• 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”
Everyday Science

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

Everyday Science

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?
Bellringer: Read the following situation and answer the following questions.

Suzie Q wants to know how different colors of light effect the growth of plants. She believes that plants can survive the best in white light. She buys 5 ferns of the same species, which are all approximately the same age and height. She places one in white light, one in blue light, one in green light, one in red light and one in the closet. All of the ferns are planted in Miracle-Grow and given 20 mL of water once a day for 2 weeks. After the two weeks, Suzie observes the plants and makes measurements.

• Hypothesis: **
• Independent Variable: **
• Dependent Variable: **
• Control Group: **
• What types of measurements can Suzie make on the plants to determine how they did in different types of light?