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Physics and Physical Measurement
N/A
8
Physics
11th Grade
12/12/2011

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Term
Fundamental Units
Definition
seven basic units of the SI measurement system: kilogram, second, mole, meter, ampere, Kelvin, candela.
Term
Derived Units
Definition
units that are combinations of fundamental units. These combinations may or may not have a separate name. (eg. 1 kg m/s2 = 1 N)
Term
Accuracy
Definition
An indication of how close a measurement is to the accepted value (a measure of correctness).
Term
Precision
Definition
An indication of the agreement among a number of measurements made in the same way (a measure of exactness).
Term
Random Uncertainty
Definition
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)
Term
Systematic Error
Definition
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)
Term
Vector
Definition
a quantity with both a magnitude and a direction
Term
Scalar
Definition
a quantity with magnitude only
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