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# physics resolution question (AS aqa) watch

1. I've been trying to get to grips with this question:
State the resolution of the main scale of the micrometer.

I know its talking about the main scale and that has divisions of 1mm but i dont get why the answer is 0.5mm since the resolution is the smallest change in an instrument. I know that the uncertainty is half the smallest division, so is the resolution the same as the uncertainty?

+ I thought the uncertainty of the main scale is 1mm anyway since it uses a micrometer so the measurement is in 2 places so im confused
2. (Original post by blankboi)
I've been trying to get to grips with this question:
State the resolution of the main scale of the micrometer.

I know its talking about the main scale and that has divisions of 1mm but i dont get why the answer is 0.5mm since the resolution is the smallest change in an instrument. I know that the uncertainty is half the smallest division, so is the resolution the same as the uncertainty?

+ I thought the uncertainty of the main scale is 1mm anyway since it uses a micrometer so the measurement is in 2 places so im confused
The main scale is the one that is on the sleeve (doesn't rotate) and that has 0.5mm divisions, so the resolution is 0.5.

Resolution is sometimes the same as uncertainty, not in this case though
3. (Original post by Dowel)
The main scale is the one that is on the sleeve (doesn't rotate) and that has 0.5mm divisions, so the resolution is 0.5.

Resolution is sometimes the same as uncertainty, not in this case though
ahh i didnt notice that
thank you!

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