Measurement / Metric Quest next class- STUDY YOUR NOTES!!!
Dimensional Analysis problems worksheet - show all units and work
3rd period only!: Finish Final write up of mass Lab for Tuesday 11/15/2011
the FD will be on a separate sheet(s) of paper from your rough draft , 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: Make a diagram!!
- 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.
Rubber stopper #
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)