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Physics CAIE
AS levels
Physical Quantities
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Created by
Thenuli Vithanage
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Cards (13)
SI base units
mass-
kilograms
length-
meters
time-
seconds
temperature-
kelvin
current-
ampere
amount of substance-
mole
luminous intensity-
candela
Scalar quantity has only a
magnitude
Vector quantities have both
magnitude
and
direction
Accuracy is how close the
measured value
is to the
true value
of the
quantity being
measured.
Precision is how close the
measured values
are to
each other
Zero error is a type of
systematic
error
which occurs when an
instrument
gives a
reading
when the
reading is supposed to be
zero
Random errors are
unpredictable
fluctuations
in a
reading
as a result of
uncontrollable
factors
such as
human
error
,
environmental
conditions
Systematic errors arise from the use of
faulty instruments
or
flaws
in the experiment
Absolute uncertainty is where the
uncertainty
is given as a
fixed quanitity
Percentage uncertainty is where the
uncertainty
is given as the
percentage of the measurement
Relative uncertainty is where the
uncertainty
is given as a
fraction
of the
measurement
Average value = (
sum of all readings
) /
number of readings
Prefixes
pico-
10^-12
nano-
10^-9
micro-
10^-6
milli-
10^-3
centi-
10^-2
deci-
10^-1
kilo-
10^3
mega-
10^6
giga-
10^9
tera-
10^12