What is the equivalent substitution method? What are the physical examples of equivalent substitutio

Cao Chong said that the balance is measured using the equivalent substitution method. As for the definition, the scope of adaptation should be experienced for yourself.

It is to equip multiple things into one, for example, in physics, gravity and tension are equivalent to a resultant force, and many resistors are equivalent to one resistance, which makes it easier to solve problems.

In the study of the resultant force, the degree of deformation of the spring caused by one force and the two forces is the same, so the effect of one force replaces the effect of two forces;

He is studying series and parallel circuits.

The effect of total resistance replaces the effect of several sub-(branch) resistors; In the relationship between the size of the image and the image in the plane mirror, another candle with the exact same is used to replace the "image" in the mirror. These are all examples of equivalent substitution research questions.

On the premise of ensuring that a certain effect (characteristics and relationship) is the same, the practical, difficult, and complex physical problems and measurement processes are replaced by simple and easy-to-study physical problems and measurement processes with the same effect.

This method of studying the problem is called the equivalent substitution method. When the equivalent substitution method studies the problem, the nature of the problem under study is the same as that of the problem that is simplified after substitution.

Equivalent substitution method application:

In the experiment of the imaging law of the plane mirror, the equivalent substitution method was used in two places. In the first place, a glass plate was used instead of a flat mirror.

Because it is not convenient to determine the virtual image with a flat mirror.

The position of the glass touching the vertical plate instead of the flat mirror is to obtain the visual fiber equivalence. Because the two have something in common in imaging characteristics - both can be imaged, the difference is that the glass plate is transparent, and the candle behind the glass plate can be observed through it, which is convenient for studying the characteristics of the image and revealing the law. In the second place, an unlit candle is placed at the imaging point to replace the image.

The above content refers to Encyclopedia - Equivalent Substitution Law.

1. When the amount to be substituted is used as an element of addition and subtraction, it cannot be used, and when it is used as an element to be multiplied or divided, it can be substituted with an equivalent infinitesimal substitution.

2. The amount of substitution by hand and limb cannot be replaced with equivalent infinitesimal when the limit value is not 0 when the limit value is not 0.

In the process of the same independent variable, if the limit of the two infinitesimal hubi is 1, then the two infinitesimal are said to be equivalent. The infinitesimal equivalence relation depicts that two infinitesimal approaches zero with equal velocity.

1) The equivalent substitution method is a commonly used scientific thinking method to dig manuscripts. Equivalence means that different physical phenomena, models, processes, etc., are the same in terms of physical meaning, effects, or physical laws. They can be substituted for each other, while ensuring that the conclusion remains unchanged.

The equivalent method refers to the face of a more complex problem, put forward a simple solution or idea, and make them exactly the same effect, so as to make the problem difficult and easy to solve.

2) For physics problems that are not easy to study or difficult to study directly, the method of indirectly studying the problems by studying the phenomena, effects, and effects manifested by them is called the conversion method.

3) The research objects of the two are different: the conversion method is suitable for physical problems that are not easy to study or difficult to study directly, and the equivalent substitution method is suitable for physical problems that make the effect exactly the same.