Archimedes’ Principle and Buoyancy Lab.docx

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Dorina Kostin

Archimedes’ Principle and Buoyancy Lab Experimenter: Ryan Stanko Lab Partner(s): Justin Bistler TA: Jacob Brown Course / Section: PHYS 2750 BB Date: April 8, 2013 COVER SHEET (1 point) Must be correctly filled out. ABSTRACT (4 points) You are expected to provide the following information in your own words in a concise format: • Brief explanation of the purpose/lab objectives • Brief summary of findings/results (include what quantities were measured and why). • Very concise statement of conclusions DATA AND ANALYSIS SECTION (19 points) To receive all points, you must have the following in your report: • All necessary data collected • Data are within a reasonable range of expectation • Units are used consistently and accurately throughout • Appropriate calculations and data transformations are made (averages, unit conversations, etc.) • All work is shown for calculations, if applicable • Answers to questions are thorough and accurate • Graphs are complete and accurate (appropriate scale, clearly labeled, and units indicated) • All questions have been answered CONCLUSION (6 points) In Conclusions you are expected to: • Summarize final important results, focusing on the stated purpose of the lab (e.g. did you achieve the lab objectives) • Explains how the results relate to the purpose of the lab vs. simply reporting the data • Discuss the consistency/inconsistency of your results with previous or accepted results, or with theory in terms of error percentage. • Identify sources of error (random or systematic) and explain their impact. ABSTRACT: During this lab, we examined the buoyancy forces that acted on objects with different masses and volumes, along with springs attached to fully submerged weights. There were four activities preformed during the lab, each with different ways to calculate the buoyant force acting on an object. In the first activity, we examined five blocks that floated on top of the water. We placed the blocks on top of the water and measured the height of block and the height of the block that was submerged to calculate an experimental density. Then we also measured the dimensions of the block to find its volume and set the blocks on a scale to find their masses to calculate the actual density of the blocks. The data collected in our trials is on the following page, page 3. We then could compare the densities we obtained and compare them to find any source of error. In activity two, we used a metal pendant of an unknown material and found its mass of 157.85 grams using a scale and then examined the mass decrease when placed in water. The mass decreased on the scale to 137.25 grams, although mass of an object never changes. We measured and calculated the volume to be 19.635 centimeters cubed. With these two properties we calculated the density to be 8.04 grams per centimeter cubed. To find the material of the unknown metal we took six known metals and measured the mass of each by scale and measured the dimensions to obtain a volume. Again we calculated the densities and found the closest number to our unknown weight since densities of the same material do not change. Our measurements and calculations are located on the back of page 3. For activity three, we predicted how a wooden block and a metal block would act on a spring in a graduated cylinder. I predicted the spring would decrease for both objects since there is the force of gravity acting on the spring. For the second prediction where we added water into the graduated cylinder until the object was completely submerged, I predicted the metal block would still compress the spring since it is very dense and therefore would sink in water, although there is still a buoyant force to raise the block. For the wooden block we added water and saw that the wood would float when placed in water. But the wood block was attached to a spring and, as I predicted would expand t
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