Error on a weighing scale due to wrong size

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    Error Scale Weighing
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Discussion Overview

The discussion revolves around the potential error introduced in weight measurements when using a weighing scale with a tray size smaller than the object being weighed, specifically focusing on a 15 cm long piece of rigid plastic on a 10 cm tray. Participants explore the implications of overhanging objects and the effects of weight distribution on measurement accuracy.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant estimates the error introduced by a 15 cm object on a 10 cm scale tray, questioning the general error for moderately rigid materials.
  • Another participant suggests that the error would be zero unless the object is resting on something or if the weight distribution is uneven enough to tilt the pan.
  • A later reply asks about the shape of the objects being weighed, indicating that holding them vertically might mitigate measurement issues.
  • One participant mentions that the shape of the objects in question is plates, which may complicate testing.
  • Another participant reiterates that the expected error remains zero, despite the challenges in testing.
  • One participant proposes conducting experiments with test items to observe variations in weight measurements when offset and hanging over the pan.

Areas of Agreement / Disagreement

Participants express differing views on the potential error introduced by overhanging objects, with some asserting that the error is zero under certain conditions, while others seek to explore the variability through experimentation. No consensus is reached regarding the impact of the overhang on measurement accuracy.

Contextual Notes

Participants note limitations in testing due to the shape of the objects and the inability to conduct certain experiments, which may affect the conclusions drawn about measurement errors.

cloa513
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If you have say a 15 centimetre long piece of rigid plastic and the weighing scale's tray is only 10 centimetres, what is an estimate of the error that introduces in the measurement assuming the weight is still within normal parameters for the weighing scale. I was wondering what the approximate error in general for moderately rigid materials? It happens now and again at work.
 
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I would expect zero, unless the overhanging part is resting on something or the weight distribution is so uneven it's tilting the pan.

What shape are the things you weigh? Can you hold them vertical somehow so they are fully within the pan? For example, if they are rod-shaped they could be placed horizontally across the top of a cup and then nearly-vertically in it. Then you could compare the measured weights with and without an overhang as a test. Remember to repeat each measurement a few times (take everything off the scale and put it back on) to check your precision.
 
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Shape of things- plates.
 
Hard for you to test, then. The answer is still zero.
 
cloa513 said:
I was wondering what the approximate error in general for moderately rigid materials?
Experiment with a test item, offset and hanging over the pan in different directions. Then break it up and weigh it in the pan. How much variation do you see?
 
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