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Anonymous users2024-02-06There is no formula for calculating both, static friction.
The relative motion between the size and the object.
The greater the trend, the greater the static friction, which can be analyzed by the force on the object.
Derive its specific value. The maximum static friction, which is slightly greater than the sliding friction, is generally considered to be equal to the sliding friction. Sliding friction formula: f = n.
Static friction: When two objects in contact with each other have a tendency to slide relative to each other, but remain relatively stationary, they act on each other to hinder the resistance of relative sliding, which is called static sliding friction.
Abbreviated as static friction, it is generally expressed by f. It is defined as the obstruction of an object by another object that has a tendency to move relative to the surface of another object. The magnitude of the static friction force can vary between 0 and fmax (0 f fmax, where fmax is the maximum static friction force, which is related to the positive pressure), and should generally be determined by equilibrium conditions or Newton's laws depending on the state of motion of the object.
to solve. Sliding friction:
Sliding friction is the force generated between two objects with relative sliding on the contact surface that prevents them from sliding relative to each other. Always tangent to the contact surface, and opposite to the object and in the opposite direction of motion. The so-called relative is still based on the object applying friction as the reference frame.
Target. The value is approximately equal to the maximum static friction. With the same roughness of the contact surface, the magnitude of the sliding friction f is proportional to the positive pressure: f = n ( is the dynamic friction factor.
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Anonymous users2024-02-05There is no formula for both, the maximum static friction is slightly greater than the sliding friction, and the formula for sliding friction is f=uf
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Anonymous users2024-02-04The magnitude of the frictional force is calculated by the formula f= n, and the equation is called the kinetic friction factor.
n is the positive pressure, and the direction of the frictional force is relative to the motion of the object.
or relative to the opposite direction of the movement trend.
Friction: The force that hinders the relative motion (or relative tendency of motion) of an object is called friction. The direction of frictional force is opposite to the direction of the relative motion (or relative tendency of motion) of the object. Friction is divided into static friction.
There are three types of rolling friction and sliding friction. When an object slides on the surface of another object, friction occurs between the contact surfaces that hinders their relative motion, which is called sliding friction. Sliding friction:
The size is related to the roughness of the contact surface and the amount of pressure. The greater the pressure, the rougher the contact surface of the object, and the greater the sliding friction generated.
Formula: f= fnThe sign of friction is f.
When two objects in contact with each other are in relative motion or have a tendency to move relatively, a force that hinders the relative motion or tendency to move on the contact surface is called friction.
Conditions: First, objects are in contact with each other;
Second, there is a mutual squeezing effect between objects;
Third: rough contact surface of the object;
Fourth, there is a tendency or relative motion between objects;
Ways to increase beneficial friction:
1) Increase the roughness of the contact surface;
2) increase the pressure;
3) Transform rolling friction into sliding friction or static friction;
Ways to reduce harmful friction:
1) Replace sliding friction with rolling friction;
2) Separate the contact surface [form a layer of air cushion or magnetic levitation on the contact surface of the object.
3) reduce pressure;
4) Reduce the roughness of the contact surface of the object and the degree of chain land.
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Anonymous users2024-02-03Sliding friction is equal to the kinetic friction factor multiplied by the positive pressure between two objects!
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Anonymous users2024-02-02The formula for calculating friction is f=ma. Here a is the coefficient of friction. m is the mass of the object.
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Anonymous users2024-02-01Static friction. The size is generally not calculated.
All of them are measured by the through-grinding Wang resistance dynamometer.
For example, if you pull a truck with a force of 10 N (the Kalingsheng car is not moving), then the truck is blinded by the static friction of the ground, which is 10 N
Pull with 100n (not moving) The static friction is 100n This is the conclusion reached by Niu San.
The maximum static friction can be approximated as fn*u (kinetic friction factor.
multiply by the positive pressure).
As said upstairs.
When the object is not moving, the static friction force is equal to the magnitude of the driving force (the driving force is the resultant force other than the static friction force).
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Anonymous users2024-01-31The formula for calculating friction depends on the type of friction, and there are two main cases: static friction and dynamic friction. Here's how they are calculated:
1.Static friction.
Static friction is the frictional force that occurs when the relative motion between two surfaces is in a state of stop. Its magnitude depends on the contact force and the coefficient of static friction between the objects. The formula for calculating static friction is:
f static = static did not guess * n
Where, f static is the static frictional force, static is the coefficient of static friction, and n is the positive pressure perpendicular to the contact surface (the force perpendicular to the surface of the object).
2.Kinetic friction:
Kinetic friction is the frictional force that occurs when two surfaces move relative to each other. Unlike static friction, kinetic friction is usually less than or equal to static friction. The formula for calculating the frictional force of the movable friction type is as follows:
f dynamic = dynamic * n
Where, f is the kinetic frictional force, dynamic is the coefficient of kinetic friction, and n is the positive pressure perpendicular to the contact surface.
It is important to note that the coefficient of friction is a constant related to the properties of the material and the surface. The coefficient of friction between different materials may vary, and the coefficient of friction of the same material may also change with the change of surface state. Due to this, in the specific problem, it is necessary to select the corresponding friction coefficient according to the actual situation.
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Anonymous users2024-01-30The formula for calculating friction varies depending on the type of friction. The two common types of friction are static friction and dynamic friction.
1.Static friction calculation formula:
The magnitude of the static friction can be expressed by the following formula:
f static = static * n
Wherein, f static is the magnitude of static friction, hall bucket is static is static friction coefficient, and n is the positive pressure on the contact surface of the object (the vertical component of the force direction of the object).
2.Dynamic friction calculation formula:
The magnitude of the kinetic friction force can be expressed by the following formula:
f dynamic = dynamic * n
where f is the magnitude of the dynamic friction, the motion is the coefficient of dynamic friction, and n is the positive pressure on the contact surface of the object (the vertical component of the force in the direction of the object).
It should be noted that the magnitude of static friction is generally less than or equal to static multiplied by positive pressure, while the magnitude of kinetic friction is equal to dynamic multiplied by positive pressure. The coefficient of friction is a physical constant number related to the condition of a specific material and surface, which needs to be determined experimentally or by reference data. Know-how.
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Anonymous users2024-01-29Only the formula for maximum static friction and stopping friction can be provided here.
f is the maximum static friction.
n is positive pressure.
u is the maximum static friction factor collision.
However, it is generally difficult to obtain u, so the maximum static friction is generally calculated by the method of force balance. The maximum static friction is when an object is repelled by a force, when it happens not to slide. The maximum static friction is close to the sliding friction.
Sometimes talking openly and quietly can approximate the same.
f is the sliding friction force.
n is positive pressure.
u is the kinetic friction factor.
This is used a lot.
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Anonymous users2024-01-28The calculation of friction usually varies depending on the situation and the specific type of friction. Here are two common types of friction calculated by formula:
1.Formula for calculating static friction:
fs ≤ s * fn
Wherein: fs is the static friction;
s is the coefficient of static friction between materials;
fn is the positive pressure or vertical force experienced by the object.
This formula indicates that the frictional force fs cannot exceed the product of the static friction coefficient s and the positive pressure (i.e., the force in the vertical direction) fn exerted on the object when the object is relatively stationary.
2.Formula for calculating dynamic friction:
fk = k * fn
Wherein: fk is the kinetic friction;
k is the coefficient of dynamic friction between materials;
fn is the positive pressure or vertical force of the lead on the object with the key.
This formula shows that the dynamic friction force fk is equal to the product of the coefficient of dynamic friction k and the positive pressure fn experienced by the object in the case of relative motion.
It is important to note that the coefficients of friction s s and k are determined by the properties of the two materials in contact and can be derived experimentally or empirically. In addition, these formulas are only suitable for some simple cases, whereas in practical applications, complex friction situations may require more complex models and formulas to calculate.
It's not hard to figure this out.
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