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The Science of Physics Section 1-3

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Organization of Data Tables Graphs

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Video on graphing-WATCH!! http://www.bozemanscience.com/beginners- guide-to-graphing-data http://www.bozemanscience.com/beginners- guide-to-graphing-data

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Equations Equations in physics are used to show relationships between physical quantities Equations are a compact statement modeling a situation Equations show how 2 or more variables are thought to be related

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Physics Equations Letters are often used to represent specific quantities V often represents velocity and t, time Greek letters are used to describe mathematical operations Δ “delta” means “difference or change in” Σ “sigma” means “sum or total” V = Δ x Δt

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Evaluating Results in Physics Dimensional Analysis— It is your best tool!!! – Dimensions can be treated as algebraic quantities Quantities can be added or subtracted only if have same units Two sides of any given equation must have the same units – When use units in calculations, you can check to see if you have set up the equation correctly.

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Evaluating Results in Physics Does your answer seem reasonable? Estimate what answer should be and see if you are within an order of magnitude.

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Number of students = about 70 Amount of ice cream per student = pint per week Amt of ice cream per year = 70 students x 1 pint/week·student x 52 weeks = 3640 pints 3640 pints x 1 gallon/8 pints = 455 or 460 gallons Estimate how much ice cream the senior class at WC eats in a year.

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