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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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