Do you think the balance measures mass or weight?

The current mainstream view is that the balance scales are about mass, not weight. The balance is balanced because the moments on both sides of the balance are equal. Moment is equal to arm, mass, acceleration due to gravity.

Because the force arm and gravitational acceleration on both sides of the balance are equal, the mass of the object is equal to the mass of the weight. According to the theory of earth expansion, the moment is equal to the product of the force arm, mass, and gravitational acceleration, which means that there is gravitational acceleration on both sides of the balance, that is, there is gravity on both sides of the balance, but it is equal. This means that the two sides of the balance are equal in weight rather than in mass, and the balance is not weighted but weighted.

Because the weight on both sides of the balance is equal and the acceleration due to gravity is equal, the mass of the object is equal to the mass of the weight, so it can also be said that the balance weighs the mass. Because mass and weight are numerically equal, that is, mass is equal to weight. However, this is relative to a balance, and the weight weighed on a spring scale at the North Pole is not equal to the mass (weight) weighed on a balance.

The quantity of matter contained in an object is called mass, which is a measure of the gravitational potential energy of an object at the same place.

and physical quantities of kinetic energy magnitude. We can see that mass is weight from the physical quantity of gravitational potential energy of an object at the same place, which defines mass. In the gravitational formula g=mg, since g is a variable and m is an invariant, it can also be seen that the mass m is the unchanging (real) weight that is not affected by g.

We can see from the fact that mass is the constant weight, mass is weight, weight is gravity, and gravity is gravitational force.

Mass is gravitational force, and gravitational force is magnetism. The acceleration g of gravity is directly proportional to the strength of the magnetic field. g is largest in the polar region, the equatorial region.

Minimum, this is because the magnetic field strength is greatest in the polar regions. The strength of the magnetic field at the equator on the Earth's surface is about Gauss.

Whereas, the magnetic field strength of the geomagnetic north pole is Gauss, and the magnetic field strength of the geomagnetic south pole is Gaussian, so the weight of the same object at the equator is lighter than that of the poles. Gravitational acceleration g and centrifugal force.

inversely proportional. The centrifugal force is greatest at the Earth's equator and the poles are 0, so the weight of the same object at the equator is lighter than at the poles. <>

Scales and scales are two different kinds of equipment, the difference between the two is the difference in function, and the general concept is divided by the level of precision. The high accuracy is the balance, and the low accuracy is the scale. I think:

In contrast to the mechanical balances used in the past, only electronic scales were used for sensors, and there were no electronic balances at all. Reason: Mechanical balances weigh mass, while sensors measure weight.

As far as the concept of physics is concerned, mass and weight are two completely different quantities. The ability to weigh mass is called a balance. Only the weight can be weighed, no matter how high the accuracy level, can only be a scale.

Balances require high precision. <>

Electronic balances and density test assemblies measure the density of solids. Density electronic balances can be used to measure the density of solids with a density greater than the density of auxiliary liquids, solids with a density less than the density of auxiliary liquids, liquid density, and the density of porous materials (e.g. oil seepage, bearing materials).

The principle of measuring the density of solids on an electronic balance:1The density of an object is the ratio of its mass to its volume.

2.Density measurement is based on Archimedes' principle. The principle is explained:

The weight lost by each solid immersed in the liquid is equal to the weight of the liquid it dislodges. 3.Solids density measurement is typically done using a liquid of known density (e.g.

water or ethanol) as an auxiliary liquid, the density of which can be calculated by weighing the mass of the solid to be measured in air (a) and auxiliary liquid (b). <>

Here's how to measure the mass of an object with a balance:

Place the balance on a level table and use tweezers to dial the tick to the zero tick mark at the left end of the scale.

Adjust the balance nut on the beam so that the pointer points to the center line of the index dial, and the balance is measured.

Put the measured object on the left plate, estimate the mass of the object first, add weights in the order of "first large and then small", use tweezers to increase or decrease the weights in the right plate, and adjust the position of the code on the scale until the balance beam is balanced.

The total mass of the weights in the tray plus the scale value of the code is equal to the mass of the object to be measured, and the mass of the object is recorded.

After sorting out the equipment, the weights should be put back into the weight box, and the game code should be returned to zero.

Let the hail branch be cut by mouth:

On the water platform, the yard is zeroed, the beam is balanced, the left object is weighted on the right, first large and then small, and the beam is balanced. Selection: Before use, observe the weighing and sensing; Flatten, Zero: Place the balance on the water platform and move the code to the zero tick line at the left end of the scale.

Leveling: Adjust the balance nut of the balance so that the pointer swings the same amount to the left and right at the center line of the index dial or to the left and right (balance balance); Weighing: Place the measured object lightly on the left plate, and use tweezers to clamp the weight to the right plate from large to small.

When the balance cannot be balanced with the smallest weight, move the yard until the balance is balanced.

Reading: The mass of the object is equal to the mass of the weight plus the scale value of the yard on the ruler (the left position corresponds to the scale), that is, m object m weight m yard; Arrange your equipment, put the weights back in the weight box, and move the weights to the zero tick line at the left end of the ruler.

Do you think the balance measures mass or weight? Does the electronic scale used in the vegetable market weigh the mass or the weight?

Hello, I know that I will answer for you wholeheartedly. It is the mass, and the gravity is measured when the spring dynamometer is stationary. Scales and balances work on the same principle, measuring the value of the object itself, which will not change on other planets.

Gravity changes on other planets. Gravity = mass * gravity coefficient. The gravitational coefficient is approximate on Earth, but not necessarily on other planets, and will change.

1. The electronic balance is designed according to the principle of electromagnetic balance, which is composed of a magnetic steel, a coil connected to the weighing pan, a displacement sensor, a current control circuit and an amplifier. The coil is placed in the magnetic field formed by the magnet, and the gravity of the weighing pan and the weighed object acts on the coil.

2. After energizing, after fully preheating the balance, the magnetic field strength remains unchanged, the coil length is fixed, and the electromagnetic force generated by the coil placed in the magnetic field (f= il) is proportional to the current intensity, if the direction of the magnetic field is adjusted so that the electromagnetic force is opposite to the direction of gravity and balances with it-mg= il, then the mass of the object is proportional to the current intensity.

3. The displacement sensor is located in the predetermined center position, when the weighing pan is put on or taken off the object, in order to maintain the balance balance, the displacement sensor changes the current size of the coil through the controller according to the detected displacement signal, and the linear coil returns to the center position, and the current change amount is amplified and converted into the quality display of the sample.

The specific teaching process of measuring the mass of an object with a balance is as follows:

1. Students have a preliminary understanding of the basic structure and use of the balance, but because the balance is a relatively precise instrument and difficult to master, this lesson should focus on guiding students to standardize the operation.

Before adjusting the balance, students should first make it clear that the unadjusted balance is unbalanced, and the quality of the weighing is not accurate, so the balance must be adjusted and balanced in advance, and in the balance adjustment link, while explaining, demonstrating, and guiding students.

In adjusting the balance, students should be asked to do so in the following order: (1) Place the balance on a level table; Wax search (2) Observe the code and ruler, know the minimum weight, and dial the code to the zero scale line; (3) Observe the initial state of the balance and determine the direction of movement of the adjusting nut; (4) Adjust to determine whether it is balanced, and then adjust until it is balanced.

Once the balance has been adjusted, the scale can no longer move its position.

3. When using a balance to weigh the mass of a liquid, it is often necessary to weigh the mass of a certain volume of liquid. At this time, we need to measure the volume of the liquid, the instrument for measuring the volume of the liquid is a measuring cylinder or measuring cup, we first need to understand the structure of the measuring cylinder and the measuring cup and how to use it.

4. Guide thinking and ask the question, "The wood, iron, and aluminum blocks weighed in today's experiment are the same in size, but are they of the same mass?" The volume of water and alcohol is 100ml, but are they of the same quality? It can be seen from the measurements that they are not the same, why is that?

The landlord added a question: My original answer is a bit less rigorous, the necessary condition for the balance to work is that there is obvious gravity, I said "near the ground" is not quite right, even on the moon or Mars, as long as there is an obvious gravitational effect, you can use the balance or the like to measure the mass. In short, the principle of measuring mass through gravity as a medium can be understood.

The landlord wants to know that all instruments rely on some kind of physical principle, and the "measuring principle" and "measuring purpose" are different. The principle of the use of this kind of mass measuring instrument mentioned by the landlord is the relationship between gravity and mass. Take the balance as an example, the reason why the mass can be measured is because near the ground, the mass can be reflected in the weight, and the weight can make the balance lever stressed, and the balance can be balanced to obtain the same weight on both sides, so as to deduce that the mass of both sides is the same, and the unknown mass is determined.

But our ultimate goal is to measure quality, so they are instruments for measuring mass, not for measuring weight. Once the weightlessness is reached, the environment has no weight, and this kind of instrument fails, which shows that all instruments have their scope of application (the environment must meet its design principle).

There are many more examples of this in physics. For example, the principle of optical microscope is optical imaging, that is, the use of light to display images; When the object you want to see is too small (such as atoms, etc.), the light cannot travel in a straight line, and diffraction occurs, resulting in indistinguishability (just like there is no weight in the case of weightlessness, the environment does not support its design principle), so you can't use an optical microscope, you have to change to an electron microscope, using electrons to display images and increase resolution.

On Earth, there is a linear relationship between mass and gravity, g = m * g, m is the mass, g is the constant, about ; Without considering the theory of relativity, the mass does not change anywhere, and the reason why the mass cannot be measured with a balance in space is that the measuring principle of the balance is "gravity", and in space g is already very small, and the attraction of the earth to small objects (gravity) is very small, so it cannot be called.

g=mg, space approximates g as 0, so there is no gravity.

The maximum weight of a high-precision electronic balance is the graduation value multiplied by 9 plus the measuring range of the balance, and the minimum weight is the graduation value multiplied by 20. For example, your high-precision electronic balance is 220g, and the index value is (the index value is the accuracy).

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