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Unformatted text preview: More Preliminaries Scientific Method Metric System Uncertainty Complex sig figs ● What if it uses both addition and multiplication rules? ● Round when you change rules. 9.23 8.4 4.53 1.882 = ( 29 2.5 1.8 (3.3 2.7) 2 + = Scientific method. ● A way of solving problems ● Observation what is seen or measured ● Hypothesis educated guess of why things behave the way they do. (possible explanation) ● Experiment designed to test hypothesis ● leads to new observations, ● and the cycle goes on Scientific method. ● After many cycles, a broad, generalizable explanation is developed for why things behave the way they do ● Theory ● Also regular patterns of how things behave the same in different systems emerges ● Law ● Laws are summaries of observations ● Often mathematical relationship Scientific method. ● Theories have predictive value. ● The true test of a theory is if it can predict new behaviors. ● If the prediction is wrong, the theory must be changed. ● Theory why ● Law – how ● Law – equation of how things change Observations Hypothesis Experiment Law Theory (Model) Prediction Experiment Modify Metric System ● Every measurement has two parts ● Number ● Scale (unit) ● SI system (le Systeme International) based on the metric system ● Prefix + base unit ● Prefix tells you the power of 10 to multiply by  decimal system easy conversions Metric System ● Base Units ● Mass  kilogram (kg) ● Length meter (m) ● Time  second (s) ● Temperature Kelvin (K) ● Electric current ampere (amp, A) ● Amount of substance mole (mol) Prefixes...
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 Spring '08
 Geldart
 International System of Units, Kilogram

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