Calculation of dynamic friction by static friction coefficient

1. The static friction coefficient is the friction coefficient in the static state, and the dynamic friction coefficient is the friction coefficient in the moving process. F= μ N

2. The dynamic friction coefficient is the ratio of the friction force and the supporting force on the object moving relative to the contact surface
the static friction coefficient is the ratio of the maximum static friction force and the supporting force on the object moving relative to the contact surface
the dynamic (static) friction coefficient has no relationship with the friction force and the supporting force on the object (this is the physical quantity defined by the ratio), The dynamic friction coefficient is related to the material of two objects in relative motion

3. Sliding friction = dynamic friction coefficient * positive pressure
maximum static friction = static friction coefficient * positive pressure
static friction coefficient is slightly larger than dynamic friction coefficient.

4. No direct relationship! But only when the friction force exceeds the maximum static friction force can the object slide.

5. As far as the uniform contact surface is concerned, the dynamic friction coefficient is always greater than the static friction coefficient
two objects proce micro pre displacement under the action of external force, namely elastic deformation and plastic deformation, but there is no friction in relative motion. The static friction at the moment when the relative motion is about to start is called ultimate static friction or maximum static friction. The maximum static friction is a ultimate friction, expressed as Fmax. The maximum static friction is directly proportional to the positive pressure n between the two contact surfaces, that is Fmax = NN
Fmax is used to represent the maximum static friction, n is used to represent the positive pressure, and the proportional constant n is called the static friction coefficient. So theoretically, the static friction coefficient is larger
and the dynamic friction coefficient will decrease slightly with the increase of relative sliding speed. So it's constant greater than.

6. < Positive & gt; The static friction coefficient is larger than the dynamic friction coefficient. Why is this common phenomenon? What is its mechanism? This paper tries to explain this problem according to the basic theory of friction. 1. Surface properties and surface interaction. Generally, the solid surface is covered by a variety of third material films (or dirty films). For metals, there are hundreds of angstroms from the dirty film to the oxide film. When these films are mixed between the friction surfaces, they act as a kind of lubricating film. Compared with the case without this film, they show different friction phenomena and friction. It is impossible to remove the dirty film completely in the atmosphere cnki:ISSN : 1000-5862.0.1984-02-011 [text snapshot]: the sliding friction of solid shows that the static friction coefficient is greater than the dynamic friction coefficient. Why is this common phenomenon? What is its mechanism? This paper tries to explain this problem according to the basic theory of friction. 1. Surface properties and surface interaction. Generally, the solid surface is covered by a variety of third material films (or dirty films). For metals, there are hundreds of angstroms from the dirty film to the oxide film. When these films are mixed between the friction surfaces, they act as a kind of lubricating film. Compared with the case without this film, they show different friction phenomena and friction. It is impossible to get rid of the dirty film completely in the atmosphere. Since the law of friction itself is derived from the friction of solids in the atmosphere, we consider the friction of clean surfaces in the atmosphere. The geometry of the surface depends on the characteristics of the processing method, table....

remember to adopt it

7. The static friction has nothing to do with the dynamic friction. If the friction is explained by the static state of the object, then when the object is at rest, the force it receives is the balance force. If the object has a relative motion tendency, then the static friction is equal to the external force in the friction direction.

8. Muyou
junior high school physics thinks that static friction is approximately equal to dynamic friction, so the coefficients are the same

9. Static friction coefficient: if two surfaces are static, a strong binding force will be formed between the two surfaces, which is called static friction coefficient. Unless the binding force is broken, one surface can move on the other surface. To break the binding force, the ratio of the force before the movement to the vertical force on one surface is called static friction coefficient
dynamic friction coefficient: the ratio of dynamic friction to positive pressure is called "dynamic friction coefficient". In the formula μ It is a proportional coefficient, and its value is related to the material and surface roughness of two objects in contact
for example, pushing an object on a rough plane proces static friction coefficient, and pushing proces dynamic friction coefficient
explain why the static friction coefficient is always less than the dynamic friction coefficient
is it a comparison between static friction and dynamic friction? If this is the case, first analyze the static friction: the object is still but generates friction. There is a tendency movement
dynamic friction: when an object moves, it proces friction. That is, there is movement
for example, to push an object on a rough horizontal surface, let μ= 5, the weight of the object is 100N, and the dynamic friction should be 50N, that is, the object moves when it has reached more than 50N, which is the function of dynamic friction. However, if 10N, 20n, 30n are used, the object will not be pushed, and it can only be paralleled according to the two forces. So the static friction is always less than the dynamic friction
if you are wrong, please correct it.

10. It's just a matter of logic
if the static friction coefficient is smaller than the dynamic friction coefficient, then when you push an object with a force greater than the static friction but less than the dynamic friction, will the object move or not?