Do not
write on this handout, make an RD in your notebook, the FD will be on a
separate sheet(s) of paper one for each student.
Title:
Just how much Rubber is in a Rubber Stopper?
Question:
How will the rubber stopper’s actual metric mass compare (more, less or same mass) to the converted
mass taken from posted English standard measurements?
Hypothesis:
The Rubber stopper’s actual mass will be________________ then/as the
posted mass.
Test:
By using a
metric balance to determine the actual mass of a Rubber stopper, we can convert
ounces to grams for the posted mass and compare to the actual mass found using
a scale.
Materials:
metric balance (triple beam pan balance), rubber stoppers of varying
size, (calculator)
Procedures:
- Convert the posted mass from oz → g
using the following formula 1oz. = 28.3 g
- Take the mass measurement of the rubber
stopper on the metric balance.
- Do this for four different rubber
stoppers with different posted masses (each table member should do all
parts of the experiment for at least one sinker)
- Subtract the measured mass in grams
from the posted mass in grams to determine the relative error. You may disregard any negative numbers9
take an absolute value of your result).
- Take the relative error in grams
and divide by the converted posted mass, in grams, and multiply by 100 to
determine the percent error.
Data:
Rubber
stopper #
|
Posted mass
Converted (g)
|
Measured mass
(g)
|
Relative
Error
|
% error
|
|
|
|
|
|
|
|
|
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|
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Observations:
Analysis:
include your calculations and math work for doing the oz-g conversions,
relative and percent error.
Make a Bar
graph of actual versus converted mass values of the rubber stoppers used.
Conclusion: (restate
the hypothesis, explain how you answered the question or not and compare
numeric results to prove or refute your hypothesis, discuss observations as
possible errors and propose a next step and who outside of this science class
might care about your results)