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B. D E Fall 2021 SI Measurement Device Measurement (cm) Quantity Length Length Length Length Length Ruler Ruler Ruler Ruler Ruler DO N US CU PA 01 Measurement (grams) SI Measurement Table 1 2 Object 3 Arrow 4 Cube Side Length 5 Cylinder 6 Rectangle 7 Rounded Rectangle 8 Table II 9 Object 10 Wooden Rectangular Solid 11 Cone 12 Yellow Cylinder 13 Blue Rectangular Solid 14 Egg 15 Table TIT 16 Object 17 None 18 None 19 None 20 None 21 None 22 23 24 Quantity Mass Mass Mass Mass Mass Device Electronic Balance Electronic Balance Electronic Balance Electronic Balance Electronic Balance Measurement (8) SI Measurement Ra Dos Quantity Time Time Time Time Time Device Stopwatch Stopwatch Stopwatch Stopwatch Stopwatch To determine the random error of a measuring device place a l in the place value of the last digit known for certain and place a zero in all other place values. PROCEDURE 1. Make five measurements of length using a ruler or meter stick. In Table I on the data sheet provide a brief description of the object being measured in the Object column. In the Device column record the device as ruler or meter stick. In the Quantity column record the quantity as Length. In the Measurement column record the measurement using numbers with units. Convert the measurements to SI units and record each in the SI Measurement column. 2. Repeat step 1 using a Vernier caliper and record the results in Table II. 3. Make five measurements of mass using a pan balance. Record the device as pan balance and the quantity as Mass. Repeat as in step I and record the results in Table III. 4. Make five measurements of mass using an electronic balance. Record the device as electronic balance and the quantity as Mass. Repeat as in step 1 and record the results in Table IV. 5. Make five measurements of Time. As fast as you can start and stop a stopwatch. Record the device as stopwatch and the quantity as Time. Repeat this for a total of five measurements. Repeat as in step 1 and record the results in Table V. 6. In Table VI in the Device column record each measuring device used in the lab. Record the random error of each measuring device in the Random Error column. 7. Convert each random error to SI units and record in the SI Random Error column. Table 1 Object Quantity Device Measurement SI Measurement Table II Object Quantity Device Measurement SI Measurement Table III Object Quantity Device Measurement ST Measurement Table IV Object Quantity Device Measurement S/ Measuremer Table V Object Quantity Device Measurement S Measurement Table VI Device Random Error St Random Error QUESTIONS 1. What was the best measuring device for length? For mass? How can you determine which is the best? 2. What are three basic quantities in the SI system? 3. Name the kinds of errors and briefly describe each. 4. How is the random error of a device determined