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Lab 2 Measurements - Lab report
Principles Of Physics (PH 101)
Queensborough Community College
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Distance is measured in meters (m), centimeters (cm), or millimeters (mm). In this experiment we are going to find the distance in every unit, despite the value we get. For liquid volume is measured in liters. The main objective of this experiment is to tell students about different units, how to measure the distance in different units, how to convert one unit to another, and also if we measure the same length with different units the result will be the same or different. Also about the accuracy of measuring, the smaller the unit, the accurate the result we get. used in the experiment To find average: add all values and divide with the number of values. 2 To find percent difference: (Established quantity) x100 of Equipment Beam Balance Measuring scale in (m), (cm), (mm). Beaker Water Calculator In this experiment we will first read the instructions carefully, because there are 4 data tables for different units, so we have to be careful to write data on the given table correctly. Then we will measure the length of the given object in meters (m), and then collect data from other groups. Then in 10s of meters (m), again collect the data from other groups. Same procedure with the centimeter (cm) measurement, and also with millimeter (mm). Then we have to take the mass of empty beaker on beam balance, then we will fill beaker up 400ml and will take mass again with water. So now we have to subtract the mass empty beaker from the mass of water and beaker together. Now we know the mass of water. Established value of 400ml water is 400g but if we got different answer, then we have to find the difference between our answer and the actual value of 400ml water. Every table has the results and calculations of its own. Part 1: Measurement of length Table 1 Measured the lab table in meters looking at just meter scale. And wrote the measurement in fractions plus the whole collected the data from other groups as well, and converted it into (cm) multiplying 100. Also calculated difference from the average of each measurement. Trial Number of units and fraction) Length (cm) (cm) 1 (Our Measurement) 2 2 m 3 266cm 1 2 (Other Group) 2 2 m 3 266cm 1 3 (Other Group) 2 2 m 3 266cm 1 4 (Other Group) 2 3 m 5 260cm 4 264 2 Average Uncertainty 2 (1) 264 266 OR 264 (4) 260 (So range of 6) between (260 and 266) Table 2 Measured the lab table in divisions looking at just meter stick with 10 divisions. And wrote the measurement in fractions plus the whole collected the data from other groups as well, and converted it into (cm) multiplying 10. Also calculated difference from the average of each measurement. Trial Number of Units and fraction) Length (cm) (cm) 1(Our Measurement) 26 1 2 265 cm 0 2 (Other group) 26 1 2 265 cm 0 3 (Other group) 26 3 5 266 cm 0 4 (Other group) 26 3 5 266 cm 0 265 0 Average 26 4 (Other group) Average Uncertainty 3 260 cm 3 2644 mm 264 2 2600 5 mm Range is 6, 260 to 266 Part 2: Measurement of Mass We have to take the mass of empty beaker on beam balance, then we will fill beaker up 400ml and will take mass again with water. So now we have to subtract the mass of empty beaker from the mass of water and beaker together. Now we know the mass of water. Established value of 400ml water is 400g but if we got different answer, then we have to find the difference between our answer and the established value of 400ml water. Mass of Beaker (g) 63 Mass of Beaker and Water (g) 453 Mass of Water (g) 390 Now we will find percent difference: Formula 400 2 percent Percent difference is: 2 Questions for Part 1 1) Which measuring device has the largest uncertainty? Is this measuring device precise? Ans : Meters device has the largest uncertainty. And yeah it is precise for measuring because sometimes the area is much bigger so definitely meters is good for measuring bigger object or distance. 2) Which measuring device has the smallest uncertainty? Is this measuring device precise? Ans : In our case its 10 division device, but normally most probably it can be millimeters, because it is the smallest unit. And it is really precise to use this device to measure small objects. Yes it is precise. 3) Is there a pattern relating the precision of the measuring device with the uncertainty? If so, describe the relationship. Ans : Actually there is not any pattern or relationship in this case. In our experiment there in not. Part 2 4) What contributes to percent difference in this part? Discuss how the equipment affects the results. Ans : Equipment measurement affects the results a lot, because now we use digital balance to measure the mass which gives the actual value, but in beam balance there can be difference of 2 to 3 percent in results, or sometimes more. It also depends on positioning of beam balance, if it is unbalanced then maybe it will give wrong results. Also human eye can do mistake while reading the results.
Lab 2 Measurements - Lab report
Course: Principles Of Physics (PH 101)
University: Queensborough Community College
