How to calculate the friction force of inclined objects

1.

The larger the inclination angle between the inclined plane and the plane, and the shorter the inclined plane, the smaller the labor saving, but the less the distance. Inclined plane is widely used in daily life, such as mountain road, conveying roller, inclined conveyor belt and so on

the mechanical efficiency of the inclined plane is 100% without calculating any resistance. If the friction is very small, the efficiency can be very high. That is to say, F2 is the force, s is the length of the inclined plane, h is the height of the inclined plane, and the weight of the object is g. When the useless resistance is not considered, according to the principle of work, it can be obtained that F2s = GH

if the slope of the inclined plane is smaller, that is, the angle between the inclined plane and the horizontal plane is smaller, the force applied to the object will be smaller, but the moving distance will be longer; vice versa. Assuming that the moving load does not cause energy storage or dissipation, the mechanical benefit of the slope is the ratio of its length to the lifting height

The friction between solid surfaces can be divided into sliding friction, rolling friction, static friction, rolling friction and rotational friction. In engineering technology, people use lubricating oil to rece friction

If two rubbing surfaces are isolated by a layer of liquid, liquid friction can occur between them. If the liquid isolation is not complete, mixed friction may also occur

air track works by air friction. The working principle of lubricating oil and air track is to use "liquid or gas (i.e. fluid) friction to replace solid friction" to work

2. To solve the problem of friction, you must understand the concept of friction, that is, the conditions under which friction occurs
the so-called friction is the force that hinders the relative motion of an object, and the direction of friction is opposite to the motion direction or relative motion direction of the object
the conditions of friction are: (1) two objects must contact each other 2) There is a squeeze between two objects 3) There is a tendency of motion or relative motion between two objects
1. When an object is stationary on a horizontal plane, if it is not pushed or pulled, it will not be affected by friction. If thrust or pull is received, it belongs to the category of static friction. The size of friction is equal to that of pull or thrust, and has nothing to do with the gravity or pressure of the object. Only the maximum static friction is related to the pressure or gravity on the object
2. If the object is pressed against the wall, the friction force is equal to the gravity of the object
3. As long as the object moves in a straight line at a constant speed on the horizontal plane, the object is subject to the action of balance force in the horizontal direction, that is, the thrust or pull force is equal to the friction force
4. If the object is not pushed by a force of 10N, the object is subjected to static friction, which is equal to the thrust. Just push with 15N force, and the friction force on the object is the maximum static friction force. If the thrust force is increased later, the friction force will not change. Theoretically, the sliding friction of objects is less than the maximum static friction, but it is generally considered that they are equal
5. The friction force is f = 15-10 = 5N when a 10N object is pulled by 15N

3. The gravity along the slope is decomposed into mgcosa (Mathematical leading angle)
F = UN = mgucosa

4. Let f be the upward force along the inclined plane, G be the downward component of gravity, and l be the friction force. Case 1: friction = 0
F = g
case 2: friction = f can be divided into two cases,
1: friction inclined plane is upward, and g = 2F
2: friction inclined plane is downward, and G + F = f leads to g = 0

5. Let f be the upward force along the inclined plane, G be the downward component of gravity, and l be the friction force. Case 1: friction = 0
F = g
case 2: friction = f can be divided into two cases,
1: friction inclined plane is upward, and g = 2F
2: friction inclined plane is downward, and G + F = f leads to g = 0

6. What is the inclination of the slope θ， Then
mg
sin θ-μ mg
cos θ= Ma
it still depends on the conditions given by the title, calculate other unknowns, and get them from this formula μ

7. 1. Generally, objects slide on an inclined plane. In this case, you can use UF. Remember that f is a positive pressure
2. When an object slides at a constant speed without any other force, according to the balance of the force, the friction is equal to the sliding component of gravity.
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there are many other cases, which should be treated specifically. Remember that as long as the speed is constant, you can balance the force, If you have acceleration, you can use f = ma. If you know u and positive pressure F, you can use f = UF

9.

Click the pet option to use intermediate or advanced skills. Click the [give riding pet] button. Then click OK to assign the skill to the blank skill bar. Repeat the operation until the pet's empty skill bar is filled. The detailed steps are as follows:

1. Set the pet in the skill bar that needs to be unlocked to battle status