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Definition
| Measurements have accuracy if the systematic error is small. |
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Definition
| A set of rulers and synchronized clocks (at rest with respect to one another) that are used by observers who are at rest in the frame to describe the motion of an object. |
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Definition
| The kilogram, metre, second, kelvin, mole, ampere and candela. All other units are combinations of these and are called derived units. |
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Definition
| Measurements have precision if the random error is small. |
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Definition
| An error due to inexperience of the observer and the difficulty of reading instruments. It can be reduced by repeated measurements. |
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Definition
| A physical quantity with magnitude only (e.g. mass). |
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Definition
| An error due to incorrectly calibrated instruments - it is the same for all data points and thus cannot be reduced by repeated measurements. |
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Term
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Definition
| A physical quantity with magnitude and direction (e.g. force). |
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