Comprehensive revision notes on Practical Skills from the Edexcel Physics A Level syllabus from an A* student in the 23/24 exam cycle. Complete with labelled diagrams and thoroughly fact checked and up to date.
, · Genera Exam Ties
When the
question asks for advantage of changing usually
·
an an experimental technique it
of 'uncertainty reduced and leads
expects an answer : will be to more accurate
value for MP2.
Smaller % U does smaller
NOT always uncertainty
·
mean
·
Give answers to save number of signtig's as the data in the question
.
Critiquing recording of data
·
-
Row data should all be recorded the
to some number of decimal places
-
processed data should be recorded to the same number of significant
figures as the rodata it came from
-
Independent variable should be atleast 6 different values ofgood range
-
All row data should be recorded
All units should be recorded quantities
-
next to
Take repeats
-
To improve ACCURACY :
reduces
·
Doing repeats and taking an average only the effect of random error .
·
Controlling the control variables well
~
Ensure rulers are vertical and read at level in order to reduce perallax
eye
Measure
·
as large a value as possible to reduce %
Uncertainty
.
·
Check for zero error on legth measurement instruments
·
Draw graphs and obtain gradients
data logger instead of stopwatch reduces
Using light gate +
the effect of
-
human reaction time and lowers percentage uncertainty
Use fiducial markers to help count oscillations
·
·
measure over several intervals and divide by number of intervals to
reduce
percentage uncertainty
.
·
Using datalogger
a :
Allows for short time
more
readings in a
-
-
Increases sample rate
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