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12 Cards in this Set
- Front
- Back
Type: Absolute
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the actual numerical uncertainty
ex. 13.21 m +/- 0.01 m |
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Type: Fractional
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divide the uncertainty by the value
ex. 0.1/2.0= .05 |
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Type: Percentage
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multiply fractional uncertainty by 100
ex. 0.1/2.0 x100 =5% *always round to one significant figure |
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Propagation of Error:
Adding or subtracting |
add absolute uncertainties
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Propagation of Error:
Multiplication, Division, |
add percentage uncertainties
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Propagation of error:
Powers |
when calculation involves raising to a power, multiply the percentage uncertainty by the power
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Rules for unknown uncertainty:
analogue equipment . . . |
is +/- half of the smallest scale division
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Rules for unknown uncertainty:
digital equipment . . . |
is +/- 1 of the last known digit
*if the uncertainty of the device is known, use this value instead |
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Rules for unknown uncertainty:
stopwatch controlled by a person . . . |
should be recorded to the +/- 0.1 of a second
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Rules for unknown uncertainty:
If it is unknown . . . |
+/- 1 of the smallest significant figure
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to find uncertainty for a mean . . .
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use largest discrepancy between the mean and the maximum or minimum value.
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to find uncertainty of a data value divided by number of trials. . .
ex. swing back and forth 10 times in 36.27s +/- 0.01s |
dividing by amount of trials also divides uncertainty
ex. one swing takes 3.627s +/- 0.001s |