# Easy physics questions

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Has to be done well. The required knowledge are the topics that are covered on the questions. biafdbaifubskdfbksjbfksjbskbfsk

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pallveechem123
School: University of Maryland

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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

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

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:

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.)

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.
wire and a little plastic cup.
1 little triangle shape made of
cardboard as pointer.

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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