## Jumat, 21 Oktober 2016

### BASIC MEASUREMENT

`Abstract. After doing the practicum of basic physics entitled "Basic measurements and Uncertainty " . The purpose of this practicum are  the learners capable to use tools - measuring instruments, determining the uncertainty in the measurement of single and repeated , and understand the use of numbers means . On this practicum conducted three activities , namely length measurement , mass measurement , measurement of time and temperature. the length measurement used three tools that ruler, caliper and micrometer screw. The next mass measurements are also used three kinds , namely  ohauss balace 2610 grams , ohauss balance 311 grams , ohauss balance 310 grams . whereas at the time of measurement used a stopwatch and temperature measurement used thermometer. measurement of activities began with determined the value of the smallest scale (SSV) and relative error (RE) of each tool to be used. Then all of object of each was measured three times, it is done to get the exact measurements and more accurate . The object being measured are beam and small ball . Then found the volume and density of the object being measured . Of several measured devices that are used in this experiment , measured instruments which have the highest level of accuracy that is micrometer screw with SSV 0.01 mm `
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Relative uncertainty expressed the level of precision of the measurement.

`Beams are waking up three-dimensional space formed by three pairs of square or rectangular , with at least one pair of which are sized differently . Beams have six sides , 12 ribs and 8 vertex . Beams formed by six congruent square called a cube . The small ball is with curved side is limited by a small curved area . `
`The small ball is obtained from waking semicircle rotated one full rotation or 360 degrees in diameter.`
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`Length measurement results are data obtained from experiments measuring the length that has been done . length scale is usually expressed in meters(m)`

`The result is a mass measurement data obtained from the experimental mass measurements that have been done . the amount of mass is usually expressed in grams ( g ) or kilograms ( kg )`

`1.      I was able to use the basic measuring tools . such as length measuring devices , mass measuring devices , and measuring the temperature and time . From these observations I conclude that  the smaller scale measuring instruments used the smaller the degree of guilt . The smaller the uncertainty the relative , the higher the accuracy achieved in the measurements.`
```2.      I capable determine uncertainty single and repeatedly. Uncertainty in a single measurement using

so that the results of a single measurement bit dubious because only use allegations . whereas ,uncertainty in measurement repeatedly

, where △x is deviation (the difference between each of the measurement results of the average value). ```
`From these data we can conclude the uncertainty in measurement single higher than a single measurement. `
`3.      I was able to understand the number mean. The number mean can be concluded depending on the accuracy of measuring instruments . The more rigorous measurement tool is used , the more important figure . However, an number mean in the measurement has certain limitations are (1)all non-zero numbers are number mean. Example : 72.753 ( 5 number mean). (2) All zeros are located between nonzero numbers are number mean. Example : 9000.1009 ( 9 number mean).(3)All zeros are located behind the last non-zero digit , but it is located in front of the decimal sign is number mean. Example : 3.0000 ( 5 number mean) .(4)Zeros are located behind the last non-zero digit , and behind the decimal point are number mean. Example : 67.50000 ( 7 significant digits ) .(5)Zeros are located behind the last non-zero digit and the decimal point is not important figure . Example : 4700000 ( 2 number mean).(6)Zeros are located in front of the first non-zero digit is the number is not important . Examples : 0.0000789 ( 3 number mean) `
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`SUGGESTION `
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`Once we got the basic measurement of these differences or uncertainty in each measurement. When conducting experiments on beam cube and the ball turns in the measurement uncertainty in each measurement is indeed the case, for example, measurements of length, width, height, ball diameter, mass, temperature and time. Of each measurement was proved to have different results, although the difference is not too far away. This is caused by the factors of uncertainty. For example, errors in the calibration, which is caused by a lack of good tools, it could be because of an error reading scale, or because of limited precision gauges and other uncertainty factors.`