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8 Cards in this Set
- Front
- Back
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Fundamental Units |
Seven basic units of the SI measurement system: kilogram, second, mole, meter, ampere, Kelvin and candela |
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Derived Units |
Units that are combinations of fundamental units. These combinations may or may not have a separate name (eg. 1 kg m/s2 = 1 N) |
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Accuracy |
An indication of how close a measurement is to the accepted value (a measure of correctness) |
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Precision |
An indication of the agreement among a number of measurements made in the same way (a measure of exactness) |
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Random Uncertainty |
An uncertainty produced by unknown and unpredictable variations in the experimental situation, such as temperature fluctuations and estimations when reading instruments. (Affects the precision of results - Can be reduced by taking repeated trials but not eliminated – shows up as error bars on a graph) |
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Systematic Error |
An error associated with a particular instrument or experimental technique that causes the measured value to be off by the same amount each time. (Affects the accuracy of results - Can be eliminated by fixing source of error – shows up as non-zero y-intercept on a graph) |
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Vector |
A quantity with both a magnitude ("size") and a direction |
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Scalar |
A quantity with magnitude ("size") only |
