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Unformatted text preview: Observations on Labs • Can’t choose when to put units and when not. (On essays, do you choose which sentences to use punctuation?) • Uncertainties, both for statistics AND graphs, are critical • Put results in your conclusion. Don’t say The ruler mass from the statistics and graphical analysis matched pretty well. Do say Our average density was 1 . 34 ± . 02 g/cm, predicting an average ruler mass of 134 ± 2 grams. This compares favorably with our prediction from the graph, where the average slope (density) was 1 . 3 ± . 2 g/cm, predicting an average mass of 130 ± 20 g. Derivatives and Information Recall that when we found average velocities and accelerations we lost information, that is, we needed 2 positions to find one average velocity and 2 average velocities (4 positions) to find one average acceleration. This means that if we only know the velocity (or acceleration), we only know some information about the position (or acceleration). For example, Given a function f ( t ) , if df dt > , is f ( t ) : (a) greater than 0 (b) less than 0 (c) equal to zero Acceleration...
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 Winter '08
 FRANKLIN
 Acceleration, Velocity

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