gp-2603-l03-measurements

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GP 2603 L03 Measurements Introductory to Phisics (National University (California)) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university GP 2603 L03 Measurements Introductory to Phisics (National University (California)) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty PRE-LAB QUESTIONS 1. Use Figure 4 to measure the diameter of the quarter. 24.05mm 2. Why is uncertainty important to consider when reporting data? Uncertainty indicates the accuracy within the possible range of the actual values ©eScience Labs, 2014 Figure 4: A quarter being measured by a caliper. Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty EXPERIMENT 1: RULERS VS. CALIPERS Data Sheet Table 1. Ruler and Caliper Measurements Object Ruler Caliper Measurement (cm) Uncertainty (cm) Measurement (cm) Uncertainty (cm) Marble Diameter 1.20 cm 0.05 cm 1.38 cm 1.5 cm Washer (Outer Diameter) 2.10 cm 1.05 cm 2.058 cm 2.0 cm Washer (Inner Diameter) 0.80 cm 0.05 cm 0.81 cm 0.5 cm Washer Thickness 0.10 cm 0.05 cm .14 cm .10 cm String Length 650 cm 0.05 cm 650 cm 650 cm Styrofoam® Cup Height 9.00 cm 0.05 cm 8.845 cm 10 cm Post-Lab Questions 1. Compare the measurements for objects using the ruler and caliper and write a general statement on when it is more beneficial to use a ruler rather than a caliper. On measuring simple 2-d measurement ruler is more beneficial than caliper because caliper does not fit on 2-d measurements effectively and easily 2. Comment on accuracy vs. precision for rulers and calipers. Caliper is always better in precision and accuracy both than in comparison of ruler. ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
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Measurements and Uncertainty 3. What are the sources of uncertainty when using a ruler and caliper? For the ruler, the uncertainty is + or - 0.05. For the caliper, the uncertainty is + or -0.0025 ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty EXPERIMENT 2: THE SPRING FORCE SCALE Data Sheet Table 2. Spring Scale Measurements Object 5 N Spring Scale Weight (g) Uncertainty (g) 10 N Spring Scale Weight (g) Uncertainty (g) 50g Weight .4 N 2 0.5 N 1 100g Weight .9 N 3 1.0 N 2 250g Weight 2.4 N 5 2.6 N 4 500g Weight 4.9 N 7 5.0 N 6 Post-Lab Questions 1. What are the advantages and disadvantages of using a spring scale to measure weight? The disadvantage is that as shown in the results the two spring scales have separate tenths measurements which skews the results. An advantage would be the accuracy of a spring scale, when used correctly 2. What are sources of uncertainty when using a spring scale? ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty 3. The 5 N spring scale uncertainty was 5, and the 10 N uncertainty was 10. The 5 N spring scale uncertainty was 5, and the 10 N uncertainty was 10. ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
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Measurements and Uncertainty EXPERIMENT 3: THE STOPWATCH Data Sheet Table 3. Time Data for Dropped Marble Drop (Trial) Time (s) 1 1.32s 2 1.06s 3 1.03s 4 .77s 5 .82s Post-Lab Questions 1. What are the advantages and disadvantages of using a stopwatch to measure time? The accuracy of the stopwatch method depends on how fast the one doing the experiment can press the button. Which is not the most repeatable experimental measurement. 2. What are sources of uncertainty when using a stopwatch? 3. 0.5 seconds. 4. 0.5 seconds. 0.5 seconds. ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
Measurements and Uncertainty EXPERIMENT 4: DENSITY OF THE MASS SET Data Sheet Table 4. Mass Set Density Data Quantity Measurement Uncertainty Height (cm) 2.68 cm 2.0 cm Radius (Diameter/2), r (cm) Or Base Edge Length, b (cm) 1.29 cm 1.05 cm Volume, V (cm 3 ) 14.01 c m 3 N/A Mass (g) 100 g 5g Density (g/cm 3 ) 7.1377 g/c m 3 N/A Table 5: Known Densities of Various Materials ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313
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Measurements and Uncertainty Material Density at 20ºC Aluminum 2.70 g/cm 3 Copper 8.92 g/cm 3 Lead 11.34 g/cm 3 Nickel 8.90 g/cm 3 Silver 10.50 g/cm 3 Steel 7.80 g/cm 3 Zinc 7.14 g/cm 3 Post-Lab Questions 1. Use Table 5 to determine what material the mass set is made of. Be sure to take your uncertainty into consideration. The weights are made of Zinc since the density in our equation is 7.1377 g/cm ©eScience Labs, 2014 Downloaded by thao yang (tyang87@iclpoud.com) lOMoARcPSD|19832313

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