What forces count elasticity
Publish: 2021-04-10 03:46:56
1. Elasticity is a force proced by resisting elastic deformation. The direction of the elastic force always points to the direction of the object's restitution
the shape or volume change of an object under the action of force is called deformation. When the external force stops acting, the deformation that can be recovered is called elastic deformation. In order to restore the original state of a deformed object, it is necessary to exert a force on the object in contact with it. This effect is called elasticity. That is, within the scope of elastic limit, the force proced by an object to the applied force that deforms the object is called elastic force.
the shape or volume change of an object under the action of force is called deformation. When the external force stops acting, the deformation that can be recovered is called elastic deformation. In order to restore the original state of a deformed object, it is necessary to exert a force on the object in contact with it. This effect is called elasticity. That is, within the scope of elastic limit, the force proced by an object to the applied force that deforms the object is called elastic force.
2. Elastic force is contact force. Elastic force can only exist in the place where objects contact each other, but there is not necessarily elastic force between objects in contact. Because the generation of elastic force not only needs contact, but also interaction
stands for: tension pressure support force thrust tension
stands for: tension pressure support force thrust tension
3. For example, pressure, tension and thrust are all elastic forces proced when an object wants to return to its original state e to deformation.
4. Elastic force is contact force. Elastic force can only exist in the place where objects contact each other, but there is not necessarily elastic force between objects in contact. Because the generation of elastic force not only needs contact, but also interaction
represents: Tension
pressure
supporting force
thrust
tension
represents: Tension
pressure
supporting force
thrust
tension
5. There is friction, there is resistance, there is elasticity
6. Elasticity: supporting force, pressure, pulling force, tension, buoyancy, etc
7. Pressure, supporting force, pulling force and pushing force are all elastic forces proced when an object wants to return to its original state e to deformation< br />、、
8. Two different forces
friction is the force proced when two objects are in non smooth contact and have relative motion
elastic force does not necessarily have friction force; friction force must have elastic force
since elastic force is nature force, tension, pressure, etc. belong to elastic force
friction is the force proced when two objects are in non smooth contact and have relative motion
elastic force does not necessarily have friction force; friction force must have elastic force
since elastic force is nature force, tension, pressure, etc. belong to elastic force
9. All kinds of interactions observed in daily life, such as pushing, pulling, lifting, pulling trains, forging workpieces, hitting balls, bowing and archery, all occur when objects contact with each other, which can be called contact force. According to its properties, the contact force can be summarized as elastic force and friction force,
elastic force is generated between objects which are in direct contact and have elastic deformation. Generally speaking, pressure, supporting force and pulling force are elasticity. The direction of elasticity is always opposite to the direction of deformation. The direction of pressure or supporting force is always perpendicular to the supporting surface and points to the pressed or supported object.
elastic force is generated between objects which are in direct contact and have elastic deformation. Generally speaking, pressure, supporting force and pulling force are elasticity. The direction of elasticity is always opposite to the direction of deformation. The direction of pressure or supporting force is always perpendicular to the supporting surface and points to the pressed or supported object.
10. Elastic force and friction force are both artificially defined, and electromagnetic force, as one of the four basic forces (strong force, weak force, electromagnetic force and universal gravitation), exists objectively. Therefore, all kinds of actions such as elastic force and friction force can be classified into four basic forces; For these two forces, their basic property is electromagnetic force
to understand this, we must look at it from the micro level. The first thing is to understand the structure of matter. For example, metals, from the microscopic point of view, are composed of lattice of metal cations and free electrons around the cations. Why is such a structure stable? It is because the electrostatic repulsion between cations keeps the distance between cations to prevent structural collapse; Electrons surround the cations to form a dispersed electron sea, which draws the cations together and prevents the structure from collapsing. Therefore, the main force to maintain the structure is Coulomb force, which is electromagnetic force from the four basic forces. Of course, gravitation also exists, but it is insignificant compared with electromagnetic force
then let's look at the mechanism of elasticity. Why does metal deform elastically when it is squeezed? The reason is that under the external pressure, the metal structure mentioned above is compressed, and the distance between metal cations in the direction of pressure is reced, which breaks the balance of the original Coulomb repulsion force and increases the repulsion force between cations. Therefore, it shows the trend of resisting the external pressure and restoring the original shape, which is called elasticity. So essentially, the elastic force of metal is the Coulomb repulsion force between cations, which is the electromagnetic force in the four basic functions
as for friction, the mechanism is slightly different. When two metals contact each other, some cations of one metal on the interface will contact with the electron sea of the other metal, so Coulomb gravity will occur, just like they are a metal in this area (they don't really fuse into a metal because the surface of the metal is uneven, just like a sawtooth that doesn't match well in the micro level, Only a few areas are in contact with each other), so if there is shear force in the direction parallel to the interface, these areas in contact with each other will be dislocated, and the overlapping area of the electron sea and metal cations will be reced, just as the negative charge is removed from the positive charge, so there is reverse stress, which is static friction. I personally think the dynamic friction is the elastic force caused by the deformation of the protruding part of the metal surface caused by the relative motion on the interface, so it is also the electromagnetic force
as for other substances, the internal structure is different, not necessarily the simple interaction between cations and electrons, but broadly speaking, it must be the effect of chemical bonds, and the elastic force and friction force are proced by twisting chemical bonds. What is the nature of chemical bond? That is to say, the essence is electromagnetic force
to understand this, we must look at it from the micro level. The first thing is to understand the structure of matter. For example, metals, from the microscopic point of view, are composed of lattice of metal cations and free electrons around the cations. Why is such a structure stable? It is because the electrostatic repulsion between cations keeps the distance between cations to prevent structural collapse; Electrons surround the cations to form a dispersed electron sea, which draws the cations together and prevents the structure from collapsing. Therefore, the main force to maintain the structure is Coulomb force, which is electromagnetic force from the four basic forces. Of course, gravitation also exists, but it is insignificant compared with electromagnetic force
then let's look at the mechanism of elasticity. Why does metal deform elastically when it is squeezed? The reason is that under the external pressure, the metal structure mentioned above is compressed, and the distance between metal cations in the direction of pressure is reced, which breaks the balance of the original Coulomb repulsion force and increases the repulsion force between cations. Therefore, it shows the trend of resisting the external pressure and restoring the original shape, which is called elasticity. So essentially, the elastic force of metal is the Coulomb repulsion force between cations, which is the electromagnetic force in the four basic functions
as for friction, the mechanism is slightly different. When two metals contact each other, some cations of one metal on the interface will contact with the electron sea of the other metal, so Coulomb gravity will occur, just like they are a metal in this area (they don't really fuse into a metal because the surface of the metal is uneven, just like a sawtooth that doesn't match well in the micro level, Only a few areas are in contact with each other), so if there is shear force in the direction parallel to the interface, these areas in contact with each other will be dislocated, and the overlapping area of the electron sea and metal cations will be reced, just as the negative charge is removed from the positive charge, so there is reverse stress, which is static friction. I personally think the dynamic friction is the elastic force caused by the deformation of the protruding part of the metal surface caused by the relative motion on the interface, so it is also the electromagnetic force
as for other substances, the internal structure is different, not necessarily the simple interaction between cations and electrons, but broadly speaking, it must be the effect of chemical bonds, and the elastic force and friction force are proced by twisting chemical bonds. What is the nature of chemical bond? That is to say, the essence is electromagnetic force
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