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A level Physics
Foundations of physics
Measurements and uncertainties
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Cards (12)
Random error
is
unpredictable
Will Affect the
gradient
of the graph
To
reduce
affect we take
multiple measurements
Systematic
errors will affect
all
errors by the
same
amount
Will not affect
gradient
but
displace
it
examples include
zero
error or
parallax
error
Percentage uncertainty =
Absolute
uncertainty/
True
Value *
100
Accuracy
How
close
the
value
is to the
true
value
Precision
How
close
results are to
each other
Percentage uncertainty of a gradient
Percentage
uncertainty of a gradient = (
best
gradient - worst gradient/
best
gradient) *
100
Absolute uncertainty from a dataset
1/2
*
range
Absolute uncertainty of a device
smallest scale
measurement
Percentage uncertainty equation
Absolute
uncertainty/
True
Value
*
100
When adding or subtracting uncertainties
We
add
the
absolute
uncertainties
When multiplying or dividing uncertainties
We
add
the
percentage
uncertainties
For Powers in uncertainties
We
multiply
the power by the
percentage
uncertainty