[Question] What’s the absolute uncertainty of a micrometer and a vernier calliper Watch

Imdad Kadir
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What’s the absolute uncertainty of a micrometer and a vernier calliper
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yoboydylan
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m8 what is this
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JammieDodger27
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Physics

(Original post by yoboydylan)
m8 what is this
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_gcx
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Calipers have an absolute uncertainty of \pm 0.1 \text{mm} and micrometers have an absolute uncertainty of \pm 0.01 \text{mm}.

(Original post by yoboydylan)
m8 what is this
not helpful
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Ryan0887
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0.001 mm I think
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Imdad Kadir
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I’m gonna post this on the a level forum
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Imdad Kadir
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How do I delete this post
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_gcx
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(Original post by Ryan0887)
0.001 mm I think
I think it depends on the micrometer - I've seen both 0.01mm and 0.001mm accepted. (so either is fine)
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_gcx
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(Original post by Imdad Kadir)
How do I delete this post
This is the right place Subject specific questions belong in the subject subforums - it's just that a lot of people post on the A-level forum and sometimes it doesn't end up getting moved.
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Imdad Kadir
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(Original post by _gcx)
This is the right place Subject specific questions belong in the subject subforums - it's just that a lot of people post on the A-level forum and sometimes it doesn't end up getting moved.
Oh okay thank you for your help
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Sinnoh
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(Original post by _gcx)
Calipers have an absolute uncertainty of \pm 0.1 \text{mm} and micrometers have an absolute uncertainty of \pm 0.01 \text{mm}.



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Wait - so calipers and micrometres measure down to 0.1mm and 0.01mm respectively - wouldn't that mean that the most that any reading could be off by is half that?
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brainmaster
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(Original post by Imdad Kadir)
What’s the absolute uncertainty of a micrometer and a vernier calliper
micrometer has resolution of 0.01mm and Vernier caliper has resolution of 0.1mm. for single measurements you use uncertainty of half resolution and if you have many readings then use uncertainty as half of range
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Imdad Kadir
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(Original post by Sinnoh)
Wait - so calipers and micrometres measure down to 0.1mm and 0.01mm respectively - wouldn't that mean that the most that any reading could be off by is half that?
(Original post by brainmaster)
micrometer has resolution of 0.01mm and Vernier caliper has resolution of 0.1mm. for single measurements you use uncertainty of half resolution and if you have many readings then use uncertainty as half of range
Scienceshorts said that the uncertainty would be its resolution as you take two measurements when using something like a ruler and micrometer (one at beginning and one end). I’m not sure how true this is or what aqa says.
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brainmaster
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(Original post by Imdad Kadir)
Scienceshorts said that the uncertainty would be its resolution as you take two measurements when using something like a ruler and micrometer (one at beginning and one end). I’m not sure how true this is or what aqa says.
maybe because I'm doing Edexcel and we use half of resolution but I've seen cases where they use resolution as the uncertainty so it could be correct
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JammieDodger27
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(Original post by brainmaster)
maybe because I'm doing Edexcel and we use half of resolution but I've seen cases where they use resolution as the uncertainty so it could be correct
It depends on the actual measurement. Its resolution if you have a potential error at both ends, its half the uncertainty if you're only measuring at one end
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