Lab 2.docx - MEASUREMENT OF MASS LENGTH AND TIME Purpose...

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MEASUREMENT OF MASS, LENGTH, AND TIME Purpose The purpose of this lab is to analyze the definition of precision and accuracy using different measurement techniques and tools. In addition, this labs was used to gain a better understanding of metric values used while taking measurements. PROCEDURE 1. Use the short (1m) meterstick to measure the length and width of the lab table. Record five measurements from different parts of the table. 2. Repeat the above using the long (1½ m) meterstick. 3. Use the digital caliper to measure the dimensions of the plastic object. Measure at different points along the length, width, and thickness of the plastic object. 4. Use the triple beam balance to take five measurements of the mass of the plastic object. 5. Use the digital caliper to measure the diameter and length of the white metal cylinder. 6. Use the triple beam balance to measure the mass of the white metal cylinder. 7. Repeat Step 5 & 6 for the golden metal cylinder. FINDINGS Data Table 1: Measuring the Lab Tables Measurements Using Short Meterstick Measurements Using Long Meterstick Meas. Length (m) Width (m) Length (m) Width (m) 1 1.3135 1.2255 1.3140 1.2255 2 1.3155 1.2250 1.3135 1.2250 3 1.3120 1.2265 1.3145 1.2255 4 1.3120 1.2275 1.3135 1.2260 5 1.3115 1.2285 1.3135 1.2270 Mean 1.3129 1.2266 1.3138 1.2258 St.Dev 0.0016355 0.0014318 0.00044721 0.00075829 Area of Table: 1.6105 m 2 2-1
Data Table 2: Measuring the Plastic Object Dimensions Mass (kg) Meas. Length (m) Width (m) Thickness (m) 1 0.05160 0.05260 0.02315 0.07285 2 0.05220 0.05180 0.02300 0.07283 3 0.05287 0.05165 0.02306 0.07288 4 0.05321 0.05102 0.02320 0.07280 5 0.05369 0.05063 0.02322 0.07290 Mean 0.05271 0.05154 0.023126 0.07285 St.Dev 0.0008259 0.0007585 0.000093702 0.00003962 Volume: 0.0000628 m 3 Weight: 0.71395 N Weight Density: 11363.1 N/m 3 Data Table 3: Measuring the Cylinders Percent Difference = 64.63% REFLECTION Measuring the Lab Tables 1. You had to make a choice between the short meterstick and the long meterstick for the best length and width measurements. Why did you choose the results you did? Compare the statistical uncertainty (standard deviation) of each meterstick. If they are not the same, offer an explanation for the improved precision.

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