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IB Physics Vocab

Section: Physics and Physical Measurement

TermDefinition
Fundamental Units seven basic units of the SI measurement system: kilogram, second, mole, meter, ampere, Kelvin, candela
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)
Accuracy An indication of how close a measurement is to the accepted value (a measure of correctness).
Precision An indication of the agreement among a number of measurements made in the same way (a measure of exactness).
Random Uncertainty An uncertainty produced by unpredictable variations in the experiments, such as temperature fluctuations and estimations when reading instruments. (Affects the precision of results - Can be reduced by taking repeated trials but not eliminated )
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)
Vector a quantity with both a magnitude and a direction
Scalar a quantity with magnitude only
Created by: mikeyWs4509
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