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. Each
group member should separately find the mass using the metric
balance. Zero scale between trials
and find the average for the object and enter into the data sheet.
 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)

Average measured
mass
(g)

Relative
Error

% error





















Observations:
Analysis:
include your calculations and math work for doing the ozg 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)
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