# UncertaintyWatch

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#1
When measuring with a ruler, does the AQA syllabus require you to double uncertainty at one end to get an overall uncertainty or do they just do it for one side
Thank you
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1 year ago
#2
(Original post by MissMathsxo)
When measuring with a ruler, does the AQA syllabus require you to double uncertainty at one end to get an overall uncertainty or do they just do it for one side
Thank you
0
1 year ago
#3
The uncertainty is +-the smallest division of the measuring instrument. Hope this helps.
2
1 year ago
#4
(Original post by MissMathsxo)
When measuring with a ruler, does the AQA syllabus require you to double uncertainty at one end to get an overall uncertainty or do they just do it for one side
Thank you
I don't know about AQA but for the SQA (Scottish qualifications) the reading uncertainty in a ruler is taken to be +/- 0.5mm and a STEEL ruler is taken to be +/- 0.1mm.
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#5
(Original post by forgotten_one)
Basically, uncertainty is normally half the division but I hear that for rulers e.g. Of resolution 1mm the uncertainty would be +-1mm rather than the expected 0.5mm due to uncertainty at both ends of the ruler. Is this right?
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1 year ago
#6
(Original post by Unknown-99)
No that is not right. It is +/- 0.5mm like you said.
I believe it is different in AQA. What board are you doing?
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1 year ago
#7
(Original post by forgotten_one)
I believe it is different in AQA. What board are you doing?
I did the SQA exams. Wouldn't it just be the same though because it's scientifically correct to assume the uncertainty in a ruler is half of the smallest division?
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1 year ago
#8
AQA Physics dictates that a ruler has an uncertainty of +- 1mm. This is because 2 measurements are being made (start and end of the ruler), so the +- 0.5mm occurs twice.
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1 year ago
#9
(Original post by DarthRoar)
AQA Physics dictates that a ruler has an uncertainty of +- 1mm. This is because 2 measurements are being made (start and end of the ruler), so the +- 0.5mm occurs twice.
Fu*k the AQA. Fu*k the SQA. Fu*k all these pi**ing exam boards.
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#10
(Original post by DarthRoar)
AQA Physics dictates that a ruler has an uncertainty of +- 1mm. This is because 2 measurements are being made (start and end of the ruler), so the +- 0.5mm occurs twice.
Thank you, so the attached rules are correct?
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1 year ago
#11
(Original post by Unknown-99)
Fu*k the AQA. Fu*k the SQA. Fu*k all these pi**ing exam boards.
Well in this case AQA isn't wrong.
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1 year ago
#12
(Original post by Unknown-99)
I did the SQA exams. Wouldn't it just be the same though because it's scientifically correct to assume the uncertainty in a ruler is half of the smallest division?
Yeah, I agree. But its written in the AQA specification. I am doing OCR A physics btw and the uncertainty is calculated in the same way as your board.
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1 year ago
#13
(Original post by forgotten_one)
Yeah, I agree. But its written in the AQA specification. I am doing OCR A physics btw and the uncertainty is calculated in the same way as your board.
Ah don't you just love exam boards and their inconsistency?
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