Finding the uncertainty of this problem

  • Thread starter charmedbeauty
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    Uncertainty
In summary, the conversation discusses finding the uncertainty in the spring constant when a mass is added to a spring and it extends a certain distance. The suggested method is to first find the spring constant without uncertainties, then calculate it with maximum and minimum uncertainties, and finally take the difference between the average and maximum or minimum uncertain values.
  • #1
charmedbeauty
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Homework Statement



When a mass of 166.5 ± 3.0 g is added to a spring the spring extends 7.20 ± 0.16 cm.

What is the uncertainty in the spring constant, k? You may assume g is known precisely with no uncertainty.

Homework Equations





The Attempt at a Solution



I just converted the units so 3.0 g = 0.003kg

and 0.16cm = 0.0016 m

so to find uncertainty I just did (0.003)(9.8)+(0.0016)

but that was wrong??

can someone please tell me what I am doing wrong here?
 
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  • #2
These problems can be quite confusing. In this case, you first find the spring constant with the mass and extention without the uncertainties. Secondly, calculate the spring constant with maximum uncertainty. The next step is up to you.
 
  • #3
flatmaster said:
These problems can be quite confusing. In this case, you first find the spring constant with the mass and extention without the uncertainties. Secondly, calculate the spring constant with maximum uncertainty. The next step is up to you.

then find it with minimum uncertainty and divide by 2??
 
  • #4
Sounds good to me.
 
  • #5
charmedbeauty said:
then find it with minimum uncertainty and divide by 2??

That will just get you the average spring constant, which you already know since the error is symmetric with respect to the average. Instead, the uncertainty is just the difference between the average and the maximum uncertainty one (or the average and the minimum uncertainty one).
 
  • #6
Steely Dan said:
That will just get you the average spring constant, which you already know since the error is symmetric with respect to the average. Instead, the uncertainty is just the difference between the average and the maximum uncertainty one (or the average and the minimum uncertainty one).

would that be the max of mass and extension or just the mass??
and the average would that be the average of mass and extension?? Thanks..
 

1. What is uncertainty in a scientific context?

Uncertainty refers to the lack of complete certainty or knowledge about a particular scientific measurement or observation. It is often expressed as a range of possible values rather than a single precise number.

2. Why is it important to calculate uncertainty in scientific experiments?

Calculating uncertainty helps to determine the reliability and accuracy of experimental results. It also allows for proper interpretation and comparison of data, and helps to identify potential sources of error in the experimental process.

3. How do you calculate uncertainty?

Uncertainty is usually calculated by taking into account the precision and accuracy of the measurement or observation. This can be done through statistical methods such as standard deviation or error propagation, or by considering the limitations of the equipment used.

4. What factors can contribute to uncertainty in a scientific measurement?

There are several factors that can contribute to uncertainty, including human error, limitations of measurement tools, variations in experimental conditions, and inherent variability in the phenomenon being studied.

5. How can uncertainty be reduced in scientific experiments?

Uncertainty can be reduced by improving the precision and accuracy of measurements, controlling experimental conditions, using more advanced equipment, and repeating experiments multiple times to obtain a more reliable average value.

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