# Scientific Method - PowerPoint PPT Presentation

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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

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Scientific Method

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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?