How to use the scale to measure the length correctly
To correctly measure the length of an object, it is necessary to use the basic tool for measuring the length - the scale, and master the methods and points of measurement.
(1) It is necessary to "three check" the scale.
Before the measurement of the experiment, the habit of first checking the measuring tool, that is, the scale, should be developed. The inspection of the scale includes three points: one is to check whether the scale of the scale is straight, whether the scale is uniform, and whether the line is clear; If the zero scale is at the end of the scale, check if the end is worn. Check the length of the two adjacent reticle (the minimum scale of the scale). And the maximum length that the scale can measure at one time.
(2) Use the scale to "five meetings"
(1) will recognize. That is, the zero scale, the minimum scale, and the measurement range of the scale are correctly recognized; (2) will be placed. Make the scale of the scale as close as possible to the object to be measured, and do not skew; (3) will see. When reading, the line of sight should be perpendicular to the object to be measured and the scale; (4) will read. In addition to reading the digits above the minimum scale, you should also estimate the number of one digit below the minimum scale; (5) will remember. Recorded measurement data, including accurate values, estimates, and units (no unit values ​​are meaningless).
(3) Using the scale to measure the length should be "five essentials"
First, according to the actual situation of the object to be measured and the accuracy of the measurement to be achieved, select the appropriate measurement tool. For example, to measure the length of the tabletop, you only need to estimate the millimeter. You can choose the scale with the minimum scale of centimeter; Window glass, to accurately read the millimeter, should use the smallest scale is the millimeter of the steel ruler or steel tape measure. In addition, in the factory or in the laboratory, there are also "vernier calipers" and "micrometers" or spiral micrometers for accurate measurement.
2. According to the characteristics of the measured object, choose the appropriate measurement method. Measuring the length of an object with a scale, there are "basic measurement method" and "special measurement method". For example, if you want to measure the length or width of a physics textbook, you can measure it directly with a scale. This method is a basic measurement method. There are also some cases where you cannot directly measure with a scale, but you need to use a scale to measure the length of the object. Perform indirect measurements, or use special tools for measurements. This method is a special measurement. For example, if you want to measure the height of the cone or the height of the ink bottle, use a set of triangles and a scale to measure the length of the curve. Then use the cotton thread to measure the length of the curve, and then use the scale to measure the length of the cotton line, which is the length of the curve (the straight curve is measured); roll the round cardboard on the curve, and record the starting point, the end point and the number of turns. The length of the curve can be calculated by measuring the circumference of the round paper (roller measurement method); to measure the thickness of each page of the textbook, the textbook can be pressed, and the thickness of the book can be measured to calculate the paper size of each page. Thickness (accumulation measurement), etc. These are special measurements.
Third, you must read correctly. When measuring, the side of the scale should be close to the object to be measured, and do not be skewed; when reading, the line of sight should be perpendicular to the side of the scale, not to the left or right, and not too high. Low, it is necessary to correctly read the accurate and estimated values ​​of the measurement according to the minimum scale of the scale.
4. It is necessary to correctly record the measurement results, and the measurement results must be written out.
5. It is necessary to calculate the average value correctly. In order to make the measurement accurate, the measurement length is often measured multiple times.
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