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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

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