What end of the ruler should be pointed at when measuring?

1. To measure the length of an object, generally align the scale of the ruler with the left end of the object.

2. Measurement is to use data to describe the observed phenomenon according to a certain law, that is, to make a quantitative description of things. Measurement is the process of quantifying non-quantified physical objects. In mechanical engineering, a measurement is defined as a unit of measurement that is to be measured and has a unit of measurement.

The standard quantities are compared numerically to determine the experimental process of understanding the ratio of the two.

Measurements explainedMeasurement is the use of data to describe observed phenomena according to certain laws, that is, to make quantitative descriptions of things. Measurement is the process of quantifying non-quantified physical objects. In mechanical engineering, measurement refers to the process of experimental understanding in which the measured quantity is numerically compared with a standard quantity with a unit of measurement to determine the ratio of the two.

Unit of measureArticle 3 of the Regulations of the People's Republic of China on the Administration of Metrology (Trial) issued on May 27, 1977 reaffirmed in the following provisions:"China's basic measurement system is the metric system (i.e., the metric system), and the international system of units is gradually adopted. "On February 27, 1984, the legal unit of measurement of the People's Republic of China was officially promulgated, and the meter system was determined to be the basic measurement system in China.

In length measurement, the unit is the meter (m), and other commonly used units are millimeters (mm) and micrometers (m). In angle measurement, it is measured in degrees, minutes, and seconds.

Grade 2 Mathematics: Unit 1, which scale of the ruler is generally aligned with the left end of the object.

0 scale aligns with the front end.

When it comes to rulers, I believe some people are clear, from elementary school we began to learn to use the long ruler to the right triangle involved in junior high school and even to the vernier caliper in high school physics, as well as a variety of rulers are used in life, many positions are also used, so since the ruler is closely related to our lives, is it necessary for us to know more about it? Next, let's introduce to you what rulers are in our lives!

Ruler: We all know that rulers can usually be made of stainless steel, plastic, iron, and some are made of glass, which can be used to measure the length of an object, measure the angle of an angle, and can be used to facilitate drawing straight lines (of course, the curved ruler can be used to draw curves) and other functions. Of course, different occasions have different requirements for the accuracy of ruler measurement, if you need to be very accurate, you can choose a ruler with high accuracy.

Types of rulers.

First of all, let's talk about the long ruler that we are most familiar with, we know from elementary school that the long ruler can be used to measure the length of a straight line, in addition to the long ruler can also be used to draw lines, in real life the long ruler has many roles, for example: workers are used in the production of wood and other tools.

Now that we know about the long ruler and its purpose, let's take a look at another type of ruler – the triangular ruler. Triangular rulers can be divided into two categories: rectangular rulers and isosceles triangular rulers!

A right-angled triangle is a triangle with one angle of 90 degrees, one angle of 60 degrees, and the other angle of 30 degrees; An isosceles triangle is a triangular shape of three triangles that are all 60 degrees. These two kinds of rulers are also widely used in our study and life, these two kinds of rulers can be used to measure some special angles, of course, they can also be used to measure the length of shorter objects.

Both rulers have one thing in common, that is, they can measure length, but they are only used to measure shorter objects, so let's get to know one that can measure some longer objects! That is the soft ruler, the soft ruler is also relatively easy to see in our life, for example, we use the soft ruler in the measurement of the three measurements of the body, the soft ruler is relatively free in measuring the length, it is not affected by the shape of the object, it can measure the length of the table of irregular objects.

In addition to the above, there is also a kind of ruler that we are also teaching - a protractor! In learning, we use a protractor to measure the size of an angle, and in life it is no exception, some workers also use a protractor to measure the size of the angle they need.

When measuring, aim the ruler's 0 scale (or an integer mark) at the very front of the object, so as to reduce the workload and error rate when the readings at both ends of the ruler are subtracted.

When measuring the length of an object, the 0 scale of the ruler should be aligned with one end of the object, that is, the starting scale of the ruler should be aligned with one end of the object.

When measuring, pay attention to laying the ruler flat, aligning the 0 scale of the ruler at one end of the object to be measured, and then looking at the other end of the object.

When using the scale, attention should be paid to aligning the edge of the ruler with the measured object, which must be placed in the right and overlapping, and cannot be skewed; The facets of the ruler must be close to the object being measured and cannot be "suspended". The line of sight is directly in front of the terminal scale mark, and the line of sight is perpendicular to the facet, so that the number of large and small squares can be clearly seen. In general, it is estimated to read the next digit of the minimum tick value.

In the conventional measurement with an ordinary scale, the following methods can be used according to different measured objects:

1. Accumulation method (also known as superposition method): put many small things together and measure their whole. For example, to measure the thickness of a sheet of paper, you can measure the total thickness of hundreds of sheets, divided by the number of sheets.

2. Combination method: use multiple tools together. For example, to measure the diameter of a ping pong ball, you can use a straight scale ruler with two triangles placed on one side and the ball clamped at the same time.

3. Roller method: This method can be used for longer distances. Calculate the circumference of the wheel first, multiply it by the number of weeks it has rolled, and it will be the distance it has rolled.

When measuring the length of an object, you should put a ruler.

Zero scale is aimed at the object.

One end, then look at the object's.

The other end is facing a few, and the length of the object is a few.

When measuring the length of an object, you should put a ruler.

Aimed at the object.

end, and then look at the object.

The length of the object is a few.

Before measuring, first look at the measurement range and minimum scale of the scale. When measuring, 1. Put it correctly: the 0 scale mark is aimed at the side of the measured object, and the scale mark should be as close to the measured object as possible;

2. Look correctly: the line of sight is perpendicular to the scale;

3. Read correctly: Measurements include accurate values and one-bit estimates, don't forget the units.

Before measuring, the scale should first look at the measurement range and minimum scale of the scale.

Steps for the correct use of the scale:

1.The scale should be aligned with the part being measured.

2.Let the scale side of the scale be close to the measured part, the beginning of the measurement is aligned with the 0 tick mark, if the 0 tick mark is worn, it can be aligned with the other whole grid tick lines, and the measurement result should be subtracted from the previous value.

3.The line of sight should be perpendicular to the ruler surface when reading.

4.When reading, the result is estimated to the next digit of the graduation value.

5.Record data to write units.

One of the tools for measuring length - a scale is used by everyone, but how to standardize the use of a scale in physics?

The scale () of the ruler should be pointed at the () end of the object, and then the () end of the object should be pointed at the number of centimeters.

Aim the scale 0 of the ruler at one end of the object, and see how many centimeters the other end of the object is facing the number. If the number is right, it is on the millimeter between two centimeters. So how many millimeters, or a few centimeters, a few millimeters.

When the scale is used, it should be parallel to the object to be measured, and the scale should be close to the object to be measured

So the answer is: right, close

When measuring, aim the 0 scale of the ruler at the very front of the object. When the same measurement is repeated many times, the absolute value and sign change randomly and unpredictably, but in terms of the overall error, the error with a certain statistical regularity is called random error.

The cause is caused by the random factors of the surveying personnel and the measuring equipment in the measurement process, which is inevitable in the measurement process, and the random error can only be reduced by improving the measurement technical skills of the measurement implementers, improving the measurement method or improving the accuracy of the measurement instrument and meter system.

1. Qualitative measurement: Qualitative measurement is also known as categorical measurement or naming measurement, which is the lowest one in the measurement level.

2. Sequencing measurement: Sequencing measurement is also known as grade measurement or sequential measurement. The value of the sequencing measurement can be arranged in a logical order to determine the level or size of the research object, and determine its rank and order.

3. Fixed-distance measurement: Fixed-distance measurement is also known as spacing measurement or interval measurement. It is not only able to distinguish social phenomena or things into different categories and levels, but also to determine the distance between them and the difference in quantity.

4. Fixed-ratio measurement: Fixed-ratio measurement is also known as proportional measurement or proportional measurement. In addition to all the properties of the above three scales, the fixed ratio measurement also has an absolute 0 point (0 point of practical significance).

Precautions for Measurement:

1. Correctly read out the zero scale, the minimum scale (the minimum graduation value), and the measurement range (range) of the scale;

2. The scale of the scale should be as close as possible to the measured object, and should not be skewed;

3. When reading, the line of sight should be perpendicular to the measured object and the scale;

4. Read out the digits above the minimum scale;

5. Recorded measurement data, including accurate values, estimated values, and units (values without units are meaningless).

To measure the length of an object, usually the scale of the ruler is aligned with the left end of the object.

The 0 scale is aimed at the very front of the object.