Physics Definitions Measurement 0.0 / 5 ? PhysicsPhysics DefinitionsInternational BaccalaureateOther Created by: Emily CookeCreated on: 26-03-14 14:52 Accuracy Measurements have accuracy if systematic error is small 1 of 9 Frame of Reference Set of rulers and synchronised clocks used by observers in the frame to describe motion of an object 2 of 9 Fundamental Units Kg,m,s,K,mol,A. All other units are combinations of these called derived units 3 of 9 Precision Measurements have precision if random error is small 4 of 9 Random Error Error due to inexperience of observer and difficulty in reading instruments. Can be reduced by repeating measurements 5 of 9 Scalar A physical quantity with magnitude only 6 of 9 Systematic Error Error due to incorrectly calibrated instruments, same for all data points and cannot be reduced by repeating measurements 7 of 9 Vector A physical quantity with magnitude and direction 8 of 9 Line of Best Fit Curve or straight line that goes through all the error bars 9 of 9
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