Metric Mastery B

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Re: Metric Mastery B

Post by ThatRoboGuy » February 24th, 2014, 5:31 pm

EVERYONE will be using the same scale to measure. So it shouldn't matter.
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Re: Metric Mastery B

Post by hscmom » February 24th, 2014, 7:33 pm

ThatRoboGuy wrote:EVERYONE will be using the same scale to measure. So it shouldn't matter.
Yes, they are all using the same scale BUT it is possible for the scale to get intentionally or unintentionally knocked off zero. Mentioning it to the supervisor lets him know about it. Perhaps he checked all equipment before the start of the hour and he is certain it was zero. Perhaps he knows that the scale is wacky and won't properly zero. But he needs to be told. Students using a scale that is not zeroed correctly (but was previously) will not get an accurate measurement (and therefore lose points).

Also, it is important that the measuring equipment be accurate. The supervisor is to measure all objects with the same measuring devices that the students will use, before the competition. If the device is inaccurate, then (especially with lighter, smaller, shorter, etc. objects) it is possible that students will lose points because their accurate estimate is not within 5% of the measured mass/length/etc. Conversely, an inaccurate estimate can appear to be dead on if the scale/ruler/whatever is inaccurate too.

I told my metric kids to check that scales are zero and immediately report it.
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Re: Metric Mastery B

Post by homesciencenerd » March 1st, 2014, 6:39 pm

it is just better to ask the judges if you or they can zero the scale
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Re: Metric Mastery B

Post by hscmom » March 2nd, 2014, 5:15 am

homesciencenerd wrote:it is just better to ask the judges if you or they can zero the scale
Didn't know you were on the forum.
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Re: Metric Mastery B

Post by Unome » March 2nd, 2014, 6:04 am

Does anyone know any good methods for estimating mass?
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Re: Metric Mastery B

Post by hscmom » March 5th, 2014, 12:12 pm

Unome wrote:Does anyone know any good methods for estimating mass?
IMO, Mass is more difficult than length and volume. One very simple thing we did is to collect different household things (a can of soup, a pack of index cards, a shoe - you get the idea) and stick them on the scale and write the mass in Sharpie.

Then practice. Heft your mass the same way each time (in other words, if you don't rest your hefting elbow on a table today, don't rest it on there tomorrow).
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Re: Metric Mastery B

Post by awesome90220 » March 23rd, 2014, 9:21 pm

I really should know this, but during measurements for things like mass and volume, how do you do the decimals on that? say you measure it to be 91.1 mm, 32.0 mm, and 28.7 mm, would you just multiply them all and stick that in as your answer?
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Re: Metric Mastery B

Post by treeling » March 24th, 2014, 8:00 am

awesome90220 wrote:I really should know this, but during measurements for things like mass and volume, how do you do the decimals on that? say you measure it to be 91.1 mm, 32.0 mm, and 28.7 mm, would you just multiply them all and stick that in as your answer?
No. Remember to use sig figs.
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Re: Metric Mastery B

Post by hscmom » March 24th, 2014, 8:18 am

treeling wrote:
awesome90220 wrote:I really should know this, but during measurements for things like mass and volume, how do you do the decimals on that? say you measure it to be 91.1 mm, 32.0 mm, and 28.7 mm, would you just multiply them all and stick that in as your answer?
No. Remember to use sig figs.
Yup. The sonic website has the SO policies on sig figs. And, remember to multiply units!
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Re: Metric Mastery B

Post by Pele » April 14th, 2014, 5:45 am

mrburrito wrote:
roz_m wrote:Does anyone have any good recourses for metric mastery? I have basic information but I want to get more into the history of the metric system.
Yes, rulers and triple beam balances. :D
Calipers usually come up on the tests too. Also, graduated cylinders would be useful.

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