Regarding the state of physical equilibrium, the state of physical equilibrium

I don't know exactly what you mean by "balance", but depending on your question, we don't know what we mean by balance.

In physics, from the perspective of theoretical mechanics, equilibrium is defined as "if all the particles of a system are always at rest, the system is said to be in equilibrium". By definition, the key to equilibrium is (relatively) rest, so uniform circular motion is not a state of equilibrium.

There are two main ways to solve the equilibrium, one is force analysis, the resultant force is zero, balance, and the other is to use the principle of virtual work.

Similar to balance, there is also the concept of "stability", which is more like what you call balance. "Stable" refers to "a system that is at rest or in a certain state of motion, and when disturbed by external sources, has a tendency to return to its original position or state of motion". Let's take a simple example.

The two balls, one on the top of the mountain and one on the valley, are stationary and, according to what has been said before, are in equilibrium. But when I gently push each of them, the first one rolls down the hill and the second one vibrates back and forth at the bottom of the valley, at which point the first ball is unstable and the second ball is stable. Another example is the Lagrange point, which is not easy to talk about here, you can go to the encyclopedia to take a look.

For the uniform circular motion you are talking about, this is probably a steady motion. In fact, whether a circular motion is stable or not is not related to uniform velocity, but to the form of the centric force in which the object is located, specifically to the form of a functional expression of the magnitude of the force and the sagittal diameter of the center of gravity of the object. Let a be the length of the sagittal diameter and f(a) be the expression of the magnitude of the sagittal diameter of the force and the center of force pointing at the object, so that k = (3 a) * f(a) + f'(a), when k is less than zero, the circular motion is stable, and when a small disturbance is received, the circular motion orbit will be used as the equilibrium orbit, and the simple harmonic vibration will be done in the sagittal radial direction.

When k is greater than zero, the circular motion is unstable, and the sagittal diameter will diverge exponentially, that is, it moves away from the center of force to infinity or hits headlong into the center of force, which is related to the direction of disturbance. When k is equal to zero, you need to continue calculating f''(a)。

After studying physics, you will find that there are many examples of balance and stability, and it is impossible to just rely on what others say, and it takes a long time to learn and accumulate.

I wish you success in your studies.

Your velocity of zero is just a zero boundary, and it is really unbalanced at this time, because it has an acceleration in the opposite direction, and if you can overcome the maximum static friction at the next moment, then you will accelerate the motion, and if you can't overcome the maximum static friction, then it will remain stationary, that is, the equilibrium state! So the equilibrium state is that the resultant external force is zero, which is also equivalent to the stationary or uniform linear motion (I don't know of any case where the external force of an object can be at rest or in a uniform linear motion that is not zero)! If you are satisfied, please select the satisfactory answer, thank you.

If necessary, you can follow up.

As long as it is stationary or uniform linear motion, it is called an equilibrium state. The net force experienced by the object at this point is zero.

The equilibrium position refers to the fact that the net force experienced by the vibrating object at a certain position is zero, and the instantaneous acceleration is also zero, and this position is called the equilibrium position. This is not a stable position, and soon the object will leave this equilibrium position. Whereas, when the object is in equilibrium, it can maintain this state for a long time.

A state in which the resultant external force is zero. In this state, the object remains at rest or moves in a straight line at a uniform speed. Until an external force causes it to change.

A state of equilibrium is when an object is at rest orUniform linear motionStatus

There are two conditions for an object to be in equilibrium: one is that the object is not subjected to force; The second is that the object is subjected to a balanced force.

The method of judging whether an object is in a state of equilibrium is mainly to see whether the object is in a state of static imitation or a uniform linear motion, as long as the object in these two states must not be affected by the force or the action of the equilibrium force

The way to determine whether two forces are a pair of balanced forces is to look at the magnitude and direction of the two forces, whether they are on the same straight sail, and whether they act on the same object

The state is in equilibrium when the resultant force experienced by the object is 0. The forces experienced by the objects are equal in magnitude and in opposite directions, satisfying Newton's first law. The equilibrium state in the motion of an object is either stationary or moving in a straight line at a uniform speed.

In the mechanical system, equilibrium refers to the inertial frame of reference, the object is under the action of several Chashi hand forces, and still remains at rest, or in a state of uniform linear motion, or a state of rotation around an axis, which is called the state of equilibrium of the object, referred to as the "balance" of the object.

If an object can remain at rest or move in a straight line at a uniform speed when it is subjected to two forces, we say that the object is in equilibrium. The two forces that keep an object in equilibrium are called equilibrium forces. The object is subjected to a balanced force, and the net force is 0, as if there is no force, and it can be approximated that the return fiber satisfies the condition of Newton's first law.

Wrong. For an object to be in equilibrium, the following two conditions must be met:

1) The net force of the rock on the object is zero, i.e., the acceleration a=0;

2) The resultant moment of the object should be zero ridge, i.e. the angular acceleration is equal to 0 (this is the so-called rotational equilibrium).

As long as the above two conditions are met, the object is in equilibrium regardless of whether it is in motion or not.

The object is subjected to a balancing force that only satisfies the first condition and fails to meet the second condition, so that the resultant moment may not be 0, which causes the object to accelerate its rotation.

The equilibrium state is the state of equilibrium and the state in which the object is at rest or in a uniform linear motion. There are two conditions for an object to be in equilibrium: one is that the object is not subjected to a force, and the other is that the object is subjected to a balanced force.

1. The understanding of rest is that rest and velocity v=0 are not the same thing, the object remains at rest, indicating a=0, a=0, both are established at the same time, if it is only v=0, a≠0, such as the object thrown to the highest point, the object can not remain stationary at this time, and the object thrown to the highest point is not in equilibrium.

2. In mechanics, when an object moves slowly, it is often considered that the object is in equilibrium.

3. Stationary and uniform linear motion seem to be two different forms of motion, but the essence is the same, because the initial motion of the object is different, if the initial state of the object is stationary, the object will always be stationary; If the initial state is a uniform linear motion, the object must remain in a uniform linear motion.

The methods and techniques for learning mathematics are as follows:

1. The habit of "listening" carefully. In order to synchronize teaching and learning, teachers should require students to concentrate their thoughts in class, concentrate on listening to the teacher's lectures, listen carefully to their classmates' speeches, grasp the key points, difficult points, and doubts, and think while listening.

2. The habit of actively "thinking". Actively thinking about the topics raised by teachers and classmates, and always being in the teaching activities, is an important guarantee to improve the quality and efficiency of learning. Students should generally achieve the following when thinking about the stool topic:

Well-founded, organized, and logical. With the increase of age, mathematical ideas such as association, hypothesis, and transformation should be gradually infiltrated when thinking about problems, and the quality of thinking questions should be continuously improved.

3. The habit of careful "review". The ability to examine questions is a comprehensive manifestation of students' various abilities. Teachers should ask students to read the textbook carefully, learn to grasp the words, understand them correctly, and carefully scrutinize key things such as prompts, marginal notes, formulas, rules, laws, and diagrams, so as to accurately grasp the meaning and extension of each topic.

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Due to the large number of inquiries now, I will answer them one by one and query and summarize the data for you, so please be patient. Please do not close the order too early, and provide more effective information in order to better answer you, thank you for your understanding and support!

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Not necessarily, the object is not necessarily at rest under the action of the equilibrium force.

It is also possible to be in a state of uniform linear motion.

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There are three states of equilibrium: rest, uniform linear motion, and uniform rotation (not "uniform circular motion").

Equilibrium force refers to the force acting on the same object to satisfy its net force of 0 and the resultant moment of 0. (I have passed the "two-force balance" in junior high school, and the multi-force balance in high school).

The object remains at rest or moves in a straight line at a uniform speed under the action of several forces.

The state in which an object remains at rest or moves in a straight line at a uniform speed is called a state of equilibrium. For an object to be in equilibrium, the following two conditions must be met: 1) The net force experienced by the object is zero, i.e., the acceleration a=0; 2) The resultant moment of the object should be zero, that is, the angular acceleration is equal to 0, (this is the so-called rotational equilibrium) As long as the above two conditions are met, regardless of whether the object is in motion or not, it is in equilibrium.

The state in which an object is at rest, in a uniform linear motion or rotating at a uniform speed relative to the ground, is called the equilibrium state of the object, or the equilibrium of the object for short. The equilibrium of an object includes the equilibrium under the action of a co-point force, the equilibrium of an object with a fixed axis of rotation, and the equilibrium of an object in general. When the force or lines of action of an object intersect at the same point, these forces are said to be common point forces.

When an object is moving in a stationary or uniform linear motion relative to the ground under the action of a common point force, it is called the equilibrium of the object under the action of the common point force. When an object is at rest relative to the ground under the action of an external force or can rotate around a fixed axis of rotation, it is called the equilibrium of an object with a fixed axis of rotation. When an object is in equilibrium under the action of a non-common point force, it is called the equilibrium of an object in general.

The equilibrium of an object is further divided into three types: casual equilibrium, stable equilibrium, and unstable equilibrium.