Edexcel physics coursework examples
Mar 11, 2018
Guidance notes on experimental work.
Section 1 – Treatment of uncertainties in Physics at AS and A2 level
One of the main aims of the practical work undertaken in GCE Physics is for candidates to
develop a feeling for uncertainty in scientific data. Some of the treatment that follows may
appear daunting. That is not the intention. The estimates of uncertainties that are required in
n are mo
re in th
re of ed
calculations. It is the intention that candidates be introduced early in the course to estimating
uncertainties so that by the time their work is assessed, they have a relaxed attitude to it. The
sections in PH1 on density determinations and resistivity are ideal for this.
Uncertainty in measurements is unavoidable and estimates the range within which the answer
ly to lie. Th
is is us
d as an ab
t can be gi
n as a
The normal way of expressing a measurement
, with its uncertainty,
. This means
that the true value of the measurement is likely to lie in the range
Note: The term “error” is used in many textbooks instead of uncertainty. This term implies
that something has gone wrong and is therefore best avoided.
Uncertainties can be split up into two different categories:
– These occur in any measured quantity. The uncertainty of
each reading cannot be reduced by repeat measurement but the more measurements
which are taken, the closer the mean value of the measure
ments is likely to be to the
“true” value of the quantity. Taking repeat readings is therefore a way of reducing the
of random uncertainties.
– These can be due to a fault in the equipment, or design of
the experiment e.g. possible zero error such as not taking into account the resistance
of the leads when measuring the resistance of an electrical component or use of a ruler
at a different temperature from the one at which it is calibrated. The effect of these
cannot be reduced by taking repeat readings. If a systematic uncertainty is suspected,
it must be tackled either by a redesign of the experimental technique or theoretical
. An ex
e of th
rt of un
in of wh
mysterious, is in the determination of stellar distances by parallax. The differences
between the distances, as determined by different observatories, often exceeds the
standard uncertainties by a large margin.
This is the absolute uncertainty expressed as a percentage of the best estimate of the true
value of the quantity.
This is the smallest quantity to which an instrument can measure
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Edexcel a level physics coursework example
Edexcel a level physics coursework example
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