Chapter 1: Units, Physical Quantities, and Vectors
1.3 Standards and Units
Unit Prefixes
1.5 Uncertainty and Significant Figures
•
Uncertainty/error
– the maximum difference there is likely to be between the measured value
and the true value
•
Accuracy
– how close a measured value is likely to be to the true value
•
Precision
– the quality of being reproducible in amount or performance
•
Fractional/percent error
– a measurement of how far off a value is from the accepted value
•
Significant figures
– number of meaningful digits in a measured value
1.6 Estimates and Orders of Magnitude
Orderofmagnitude estimate
– an estimate rounded to the nearest power of ten
•
things that differ by a factor of ten are said to differ by one
order
of magnitude
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View Full Document1.7 Vectors and Vector Addition
•
Scalar quantity
– a quantity that has magnitude but not direction
•
Vector quantity
– has both a
magnitude
and a direction in space
o
magnitude
– the measure or size of something
always positive
o
displacement
– a change in position of a point (vector quantity)
parallel
– two vectors that have the same direction
negative of a vector
– a vector having the same magnitude as the original vector but the
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 Spring '11
 McDemus
 Physics, Addition, Vector Space, Dot Product, 0°, 180°, Bcosφ

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