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Name _________________________________ I.D. Number _______________________ Project 1 Evaluation 31 Physics 1 (SCIH 035 058) Creating a Mass Scale with Elastic Materials This project is worth 9% of your overall grade for this course. Be sure to read all the instructions and assemble all the necessary materials before you begin. You will record your data and insert your answers in the Project Write-up section of this project. When you have completed this project you may submit it electronically through the online course management system. Check the instructions in the online course for more information. Objective Construct and calibrate a mass scale with simple materials and test its accuracy, precision, and range. Instructions Since you have completed the Tension Lab Activity in Lesson 7, you should have a good understanding of the way rubber bands respond under various amounts of tension. Step 1: Use the knowledge you gained from the Tension Lab Activity in Lesson 7 to create and calibrate a scale capable of accurately measuring the mass of a variety of objects. Step 2: You may use rubber bands or any other elastic material but you may not use any components made for use as part of a commercially available scale or balance (one that you buy already constructed) in your scale construction. Step 3: Decide what range of masses you intend to measure. Suggestions include: 1 – 10 g 5 – 50 g 10 – 100 g 1 – 100 g 5 – 500 g Note that if you are building a scale that will function over a large range of masses, you may need to build separate components (one part to measure masses between 1 and 10 grams and a separate part to measure masses between 10 and 100 grams. Project 1 SCIH 035 Step 4: Decide what accuracy your scale should have (accuracy is ability to measure the CORRECT value). No matter what mass you are measuring, you should not be more than 5% off. Calculate the % error. % Error = ((actual mass – measured mass) / actual mass) * 100% Step 5: Decide what precision your scale should have (precision is the ability to give the same measurement for a mass, time after time. If you place a 5 gram mass on the scale three separate times, the readings should be the same each time to within +/- so many grams. As with accuracy, smaller masses should have smaller variances between readings. Precision is usually reported as the range / 2. Range is easily calculated by “highest measurement – lowest measurement.” The final answer is given as “average measurement +/- precision.” Step 6: Calibrate your scale. Use a series of known masses to calibrate your scale. Use masses near the low end, the middle, and the high end of your working range. You cannot assume that your scale will respond equally to the addition of each mass. Record your work in the data tables provided. You may add space or pages to the Project Write-up section if you need them. Step 7: Test your scale. Use a series of known masses to check the function of your scale. This will feel similar to the calibration but this actually a separate step. The way your elastic material behaves may change over time and so you may not get the same readings that you did at the beginning of your calibration. Think of how a sweater “stretches out” as you use it—similar things happen to rubber bands. Use at least 3 masses, one near the low end, one at the middle and one near the high end of your working range. For each mass, test it at least three times to measure accuracy and precision. Project 1 Step 8: Make at least one significant change to your scale to improve its performance. If the performance of your scale did not meet your expectations, make a change to the way it is constructed or the materials you are using. If it already met your design parameters, make a change to increase its performance capabilities (allowing it to measure a wider range of masses, for example. Step 9: Repeat your test measurements record your data in a table then analyze your results. Did you improve the performance of your scale? If so, by how much? Step 10: Suggest additional changes that could improve the performance of your scale even more. SCIH 035 Project Write-up (20 points) Fill in the following tables and answer the following questions. Don’t forget to use the Grading Rubric as a guide to gauge how effectively you complete this portion of your project. Prediction (what your scale is designed to do) 1. Elastic Material Chosen (be specific, what kind, what size, how many, etc.) 2. Working Range of Scale 3. Accuracy of Scale (calculate % error) 4. Precision of scale (Precision is generally indicated as +/- half the range) Performance (what you scale actually does) 5. (5 pts) Construction: (Describe how your scale is constructed and include a diagram or picture.) 6. (5 pts) Calibration Procedure: Describe the process you used to calibrate your scale. Create a table that shows what masses were used, and how you measured the change in your scale with each mass. Project 1 SCIH 035 7. (20 points) Test Data: you have designed your scale to perform in a certain way, but you need to test it against known masses to see if it is performing as desired. Remember that you are testing each of three masses three times. Mass Trial Actual Mass Measured Mass % Error Precision 1 1 2 3 1 2 2 3 1 3 2 3 % Error = ( (measured mass – actual mass) / actual mass) * 100% 8. (5 pts) Based on your test data, write a statement describing the accuracy of your scale at each level. 9. (5 pts) Based on your test data, write a statement describing the precision of your scale at each level. 10. (5 pts) What change did you make to improve the accuracy / precision of your scale? Project 1 SCIH 035 11. (20 points) Test Data (Round 2) Mass Trial Actual Mass Measured Mass % Error Precision 1 1 2 3 1 2 2 3 1 3 2 3 12. (5 pts) Based on your test data, what is the accuracy of your scale? How close are you the real value for each mass? 13. (5 pts) Based on your test data, what is the precision of your scale? How close are each of your measurements to each other? 14. (5 pts) Suggestions for additional improvements. What changes do you suggest and why do you think they would be helpful? Total = 100 pts Project 1 SCIH 035 Project Guidelines Objective Exceeds minimum project expectations Meets minimum project expectations Approaches course expectations Does not meet course expectations Construction Description is clear and thorough. A working device could be constructed from these instructions. A detailed picture is included showing scale and identifying materials. Description is fairly detailed but lacks some specifics like size, scale, materials, etc. A picture is included but could be more detailed. A device might be constructed from these instructions but may not be the same as the one used. Cannot tell how device was constructed from information given. Picture is missing or is not informative. Cannot tell what materials were used, their size or how they are put together. Project information does not reflect instructions. Picture is missing or is not informative. Calibration Calibration was clearly described. Masses covered low, middle, and high end of range, measurements were repeated to ensure reliability. Calibration was done and measurements covered low, middle and high but may not have been repeated or may have given unreliable results. Calibration was done but Calibration was not measurements do not cover done according to entire range and were not instructions. repeated. No confidence in reliability of measurements. Test Data Data is compiled and provided as directed and clearly reported. Calculations of %Error, accuracy, and precision are correct. Data is compiled and provided as directed but calculations may be incorrect. Accuracy and precision may need to be determined again. Data is not complete. Some calculations are missing or incorrect. Cannot determine accuracy or precision. Data is not complete. Data is not compiled and provided as directed. A reasonable improvement was suggested and made. Data clearly shows change in accuracy or precision. An improvement was suggested and made. May not see clear change in accuracy or precision. Improvement was not reasonable or data does not show change in accuracy or precision. No improvements made or data does not show change in accuracy or precision. Project demonstrates thoughtful approach. Questions are answered thoroughly and with evident self -reflection. Project was completed and questions were answered but could have shown more thoughtfulness or self reflection. Project is completed to minimal specifications. Questions are answered but are not thoughtful. Student does not demonstrate self reflection. Project is not completed to minimal specifications. Changes Made Effort This project can be submitted electronically. Check the Project page under “My Work” in the UNHS online course management system or your enrollment information with your print materials for more detailed instructions. Project 1 SCIH 035 ...
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pallveechem123
School: University of Maryland

Attached.

Name

_________________________________

I.D. Number

_______________________

Project 1
Evaluation 31
Physics 1 (SCIH 035 058)

Creating a Mass Scale
with Elastic Materials

This project is worth 9% of your overall grade for this course. Be sure to read all the instructions and
assemble all the necessary materials before you begin. You will record your data and insert your
answers in the Project Write-up section of this project. When you have completed this project you
may submit it electronically through the online course management system. Check the instructions in
the online course for more information.

Objective
Construct and calibrate a mass scale with simple materials and test its accuracy, precision, and
range.

Instructions
Since you have completed theTension Lab Activity in Lesson 7, you should have a good
understanding of the way rubber bands respond under various amounts of tension.
Step 1:

Use the knowledge you gained from the Tension Lab Activity in Lesson 7 to
create and calibrate a scale capable of accurately measuring the mass of a
variety of objects.

Step 2:

You may use rubber bands or any other elastic material but you may not use
any components made for use as part of a commercially available scale or
balance (one that you buy already constructed) in your scale construction.

Step 3:

Decide what range of masses you intend to measure. Suggestions include:
1 – 10 g
5 – 50 g
10 – 100 g
1 – 100 g
5 – 500 g
Note that if you are building a scale that will function over a large range of
masses, you may need to build separate components (one part to measure
masses between 1 and 10 grams and a separate part to measure masses
between 10 and 100 grams.

Step 4:

Project 1

Decide what accuracy your scale should have (accuracy is ability to measure
the CORRECT value). No matter what mass you are measuring, you should
not be more than 5% off. Calculate the % error. % Error = ((actual mass –
measured mass) / actual mass) * 100%

SCIH 035

Step 5:

Decide what precision your scale should have (precision is the ability to give
the same measurement for a mass, time after time.If you place a 5 gram mass
on the scale three separate times, the readings should be the same each time
to within +/- so many grams.As with accuracy, smaller masses should have
smaller variances between readings. Precision is usually reported as the
range / 2. Range is easily calculated by “highest measurement – lowest
measurement.” The final answer is given as “average measurement +/precision.”

Step 6:

Calibrate your scale.Use a series of known masses to calibrate your
scale.Use masses near the low end, the middle, and the high end of your
working range.You cannot assume that your scale will respond equally to the
addition of each mass.Record your work in the data tables provided.You may
add space or pages to the Project Write-up section if you need them.

Step 7:

Test your scale.Use a series of known masses to check the function of your
scale.This will feel similar to the calibration but this actually a separate
step.The way your elastic material behaves may change over time and so you
may not get the samereadings that you did at the beginning of your
calibration.Think of how a sweater “stretches out” as you use it—similar things
happen to rubber bands.
Use at least 3 masses, one near the low end, one at the middle and one near
the high end of your working range.For each mass, test it at least three times
to measure accuracy and precision.

Project 1

Step 8:

Make at least one significant change to your scale to improve its performance.
If the performance of your scale did not meet your expectations, make a
change to the way it is constructed or the materials you are using. If it already
met your design parameters, make a change to increase its performance
capabilities (allowing it to measure a wider range of masses, for example.

Step 9:

Repeat your test measurements record your data in a table then analyze your
results.Did you improve the performance of your scale?If so, by how much?

Step 10:

Suggest additional changes that could improve the performance of your scale
even more.

SCIH 035

PROJECT
Fill in the following tables and answer the following questions. Don’t forget to use the
Grading Rubric as a guide to gauge how effectively you complete this portion of your project.

1.

Elastic Material
Chosen (be specific,
what kind, what
size, how many,
etc.)

Prediction (what your scale is
designed to do)

Performance (what you scale
actually does)

1 wooden board 25 cm x 10 cm.

Does not apply.

1-3 rubber bands, 8 cm diameter,
1 pushpin.
1opened metal clip.
1 little plastic basket made from thin
wire and a little plastic cup.
1 little triangle shape made of
cardboard as pointer.
Paper adhesive tape.

2.

Working Range of
Scale

3.

Accuracy of Scale
(calculate % error)

50-250 grams.

The division in the scale is given by
the difference between small lines.
There ...

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