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Problem Solving A Scientific Process

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**A Scientific Process… Is Based on Observed Facts**

Has Repeatable Results Produces Verifiable Outcomes Is Carried Out in a Standard, Systematic Way

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Scientific Method The Standard, Systematic Way to Carry Out a Scientific Process Hypothesis (Untested Idea) Experiment (Test to Check Validity of Hypothesis) Theory (Valid Explanation of Observations) Model – Simplified Theory with Assumptions Law (Summary of Key Experimental Observations)

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The Scientific Method Experiment Theory Law Hypothesis

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**Scientific Problem Solving**

Hypothesis Experiment Theory/Law Understand Problem Concepts Propose Solution Based on Applicable Relationships Try Proposal (ie – Do the Math!) Check Results – Do they Make Sense? Document/Summarize Results

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**It’s All About Measurements**

Measurement – 3 Parts A Number or Value; Magnitude A Unit: Provides the Standard Scale One of the Standard Scale – Known and Constant Eg, pound, gram, liter, newton What is Being Measured – Sometimes Very Important

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**Examples of Measurements**

3.98 calories of heat 5.67 newtons force of bowling ball striking pins 10.0 liters of water 57 km/hour auto speed 7.65 gallons gasoline

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**Not Measurements Objects Counted**

Definitions – eg. Exactly 2.54 cm = 1 inch Why Not? Counted Items and Definitions are not debatable They are “perfect” No “perfect” measurements; always error; never exact

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**A Very Useful Technique**

Dimensional Analysis (aka “Factor Labeling”) Converting a Measurement from One Unit to Another “Cutting to the Chase” of a Proportion Problem m Unit 1 x Unit 2/Unit 1 = n Unit 2 Problem to Try – How many pounds is 583 grams?

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Objectives Describe the purpose of the scientific method. Distinguish between qualitative and quantitative observations. Describe the differences between.

Objectives Describe the purpose of the scientific method. Distinguish between qualitative and quantitative observations. Describe the differences between.

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