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List of contents of this article:

• 1, Understanding of the total potential energy of the system
• 2
  、 Who can explain what conservative force means in college physics?!!
• 3, Lagrange's equation (the secondThree forms of class), theoretical mechanics, it's better to write thank you
• 4, What are conservative and non-conservative forces?
• 5, What is conservative internal force?What is non-conservative internal force?
• 6、Is the two isolated systems of complete elastic collision a conservative system?

Understanding of the total potential energy of the system

The total potential energy is to multiply each charge by Its electric potential. In electrostatics, Electric potential energy is the potential energy of the charge distribution in the electric field, which is related to the configuration of the charge distribution inside the system.The unit of electric potential energy is jole. Electric potential energy is different from electric potential.

Potential energy is the energy possessed by an object under the action of the potential field in the potential field, such as the gravitational field. In fact, it is incomplete to say that an object has gravitational potential energy. More strictly, it is the potential energy possessed by the system composed of an object and the earth, but there is no need to say so in ordinary processing.

The physical phenomena represented by the total potential energy and the static pressure energy are different. The total potential energy considers the kinetic energy and gravitational potential energy of the fluid, while the static pressure energy only considers the pressure on the fluid.

potential energy is the energy stored in a system, which can also be released or converted into other forms of energy. Potential energy is a state quantity, also known as potential energy. Potential energy does not belong to a single object, but is shared by an interacting object.

How to understand potential energy as follows: Potential energy is the energy of an object due to its position or position. It is the energy stored in a system that can be released or converted into other forms of energy under appropriate conditions.

Potential energy refers to the energy of an object (or system) due to its position or shape. For example, the heavy hammer of the pile driver raised to a high place has potential energy, so when it falls, it can increase its kinetic energy and work on the outside world to hit the pile into the ground; the open bow has potential energy, so it can work on the arrow when releasing energy and shoot it at the target.

Who can explain what conservative force means in college physics?!!

The definition of conservative force is the force with zero work along an arbitrary closed loop, or a force that has nothing to do with the specific path.

In physics, "conservative force" refers to a force of conservation of energy, that is, it does not cause a net loss or increase of energy inside the system. An example of conservative force is gravity. When an object falls from a height, its potential energy is converted into kinetic energy, but the total energy remains unchanged within the system.

In a physical system, if a particle moves from the starting point to the end point due to the force, and the work done by the force does not change due to different paths, this force is called a conservative force. Any force related to the path is called a non-conservative force.

Conservative force refers to the force that has nothing to do with the path, but only related to the position of the beginning and end, such as gravity.

. Because the work of the conservative force has such characteristics, the potential energy (potential energy) can only be defined when the conservative force acts on the object.The magnitude of the potential energy is only determined by the magnitude of the conservative force and the mutual position of the two objects with the action of the conservative force. In other words, potential energy is only related to the position of the conservative force field.

In a physical system, if a particle moves from the starting point to the end point, due to the force, and the work done by the force does not change due to different paths, this force is called the Conservative Force.

Three forms of Lagrange equations (Class II), theoretical mechanics, it's better to write thank you

1. The Lagrange equation in the force field is written as follows: If the main force is only partially potential, then the force is recorded in the Lagrange function, and the other non-forces calculate its generalized force separately. The form of the Lagrange equation is as follows: Among them, the generalized force corresponding to the non-force. Use the definition directly. Virtual displacement method.

2. Lagrange function: L (x, λ) = C (x) + λg (x), where C (x) is the function to be minimized, λ is the Lagrange multiplier, and g (x) is the constraint of the optimization variable x).The Euler-Lagrange equation is a basic equation that describes the movement of points, rigid bodies or continuums in a mechanical system.

3. In the "On the Three-Body Problem" (Essai sur le problémedes trois corps) completed by Lagrange in 1772, five special solutions of the system of ordinary differential equations of three-body motion were found: three are the three-body coline situation; two It is a three-body equilateral triangle; it is called the Lagrange plane in celestial mechanics.

4. dL/dx=f(x)+λg(x)=0 dL/dλ=b-g(x)=0 The second equation is the constraint condition, which means that the budget is spent (because the complete Lagrange multiplier is allowed not to be spent).

5. A branch of mechanics.It is the foundation of various branches of general mechanics. Theoretical mechanics is usually divided into three parts: statics, kinematics and dynamics.

What are conservative and non-conservative forces?

1. Common conservative forces include gravity, spring elastic force, electrostatic field force and universal gravity; non-conservative force: sliding friction.

2. Best answer Common conservative forces include gravity, spring elastic force, electrostatic field force, universal gravity; non-conservative force: sliding friction.

3. For example: friction. Common conservative forces in mechanics: gravity. Conservative forces have nothing to do with the path. Non-conservative forces are related to the path.

4. Non-conservative forces include dissipative forces and non-dissipative forces. In mechanicsMost of the non-conservative forces in contact within the range are dissipation forces, so dissipation forces have long become synonymous with non-conservative forces. Strictly speaking, there is a difference between the two. The total mechanical energy of a system decreases and transforms into thermal energy or internal energy of the system.

What is conservative internal force? What is non-conservative internal force?

1. That is, the work of the conservative force on the object is only related to the displacement of the object (pay attention to the concept of displacement), and has nothing to do with the path of displacement. Those who meet this condition are conservative, otherwise it is non-conservative.

2. Even under the influence of non-conservative internal forces, energy is still conserved. Even if the friction is considered, it is the same, but heat energy and so on will be introduced.

3. The force that has nothing to do with the path is called conservative force. If the force is the internal force of the system, it is the conservative internal force. For example, when considering the spaceship and the earth, the gravitational force between them is a conservative internal force.

4. Most of the non-conservative forces in contact within the mechanical range are dissipation forces, so dissipation forces have long become synonymous with non-conservative forces. Strictly speaking, there is a difference between the two. The total mechanical energy of a system decreases and transforms into thermal energy or internal energy of the system.

5. Combined external force includes both conservative external force and non-conservative external force, and the non-conservative force mentioned in the question refers to the non-conservative force in the system, that is, it refers to the dissipation force in the system, such as friction force. This force will cause the conversion of energy, thus affecting the mechanical energy of the system.

6、Conservative forces have nothing to do with the path, but only to the starting point and the midpoint position, such as gravity and gravity; non-conservative forces are related to the path, such as various frictions. For example: starting point a, ending point b.

Is the isolated system of two completely elastic collision a conservative system?

Common elasticity is a conservative force. Support and pressure are both elastic and conservative.

Rotate energy), such as the collision of atoms. Inelastic collision is the conversion of part of the kinetic energy of the whole system into the internal energy of at least one of the collision objects after the collision, so that the kinetic energy of the whole system cannot be constent.

If a system is in an isolated environment, it is impossible for energy or mass to enter or exit the system. In this case, the law of conservation of energy is expressed as follows: "The total energy of an isolated system remains unchanged.