physics_chapter1notes

# physics_chapter1notes - Chapter 1 Units Physical Quantities...

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Chapter 1: Units, Physical Quantities, and Vectors 1.3 Standards and Units Unit Prefixes 1.5 Uncertainty and Significant Figures Uncertainty/error – the maximum difference there is likely to be between the measured value and the true value Accuracy – how close a measured value is likely to be to the true value Precision – the quality of being reproducible in amount or performance Fractional/percent error – a measurement of how far off a value is from the accepted value Significant figures – number of meaningful digits in a measured value 1.6 Estimates and Orders of Magnitude Order-of-magnitude estimate – an estimate rounded to the nearest power of ten things that differ by a factor of ten are said to differ by one order of magnitude Page | 1

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1.7 Vectors and Vector Addition Scalar quantity – a quantity that has magnitude but not direction Vector quantity – has both a magnitude and a direction in space o magnitude – the measure or size of something always positive o displacement – a change in position of a point (vector quantity) parallel – two vectors that have the same direction negative of a vector – a vector having the same magnitude as the original vector but the
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physics_chapter1notes - Chapter 1 Units Physical Quantities...

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