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physics as
foundations of physics
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Cards (20)
The SI unit of force is the
newton
(
N
).
the prefix pico(p) is
1x10-12
en error is the difference between the
result
obtained and the
true value
of the quantity.
scalar quantities have
magnitude
but not
direction
vector quantities have both
magnitude
and
direction
an SI unit is a
base
unit of a
physical
quantity
accuracy is a measure of how close a
measured
value is to the
true
,
accepted
value
a measurement is valid if it
measures
what it is supposed to be
measuring
random error is an error that occurs due to
unexpected changes
during an experiment that cant be
predicted
an anomaly is a value in a set of results that does
not fit
the
trend
of the data
a systematic error is an error that occurs due to faulty
equipment
or faults in the experimental
method
one way to reduce systematic error is to
zero
the
balance
when its
empty
one way to reduce random error is to
repeat
the experiment and calculate a
mean
precision is how
close together
the readings are
an experiment is repeatable if the original
experimenter
can redo the
experiment
with the same
equipment
and
method
and get the same
results
to find the percentage uncertainty, divide the
uncertainty
by the
measured value
then multiply it by
100%
percentage uncertainty tells us how
accurate
our measurement was
the uncertainty on a measurement is calculated by
adding
up all the
sources
of
errors
if the experiment can be redone by a different person or with a different technique and equipment and the same results are found, it is
reproducible
resolution is the
smallest
change in the quantity being
measured
that gives a recognisable
change
in
reading