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IB Physics Vocab
Section: Physics and Physical Measurement
| Term | Definition |
|---|---|
| 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 |
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