Is there friction when an object rests against a wall and slides vertically down a rough wall?

If the wall is vertical, the object slides down the vertical wall because there is no compression and there is no elastic force between the object and the wall, and the object is not subject to friction.

It is mainly considered according to the three conditions that must be met for the friction to be generated: the contact surface of the two objects is rough; There is squeezing each other; There is relative motion.

Trend or relative movement.

Note: The presence or absence of friction is not related to whether the object is in motion or at rest, it is only related to the "relative motion or relative motion tendency" of the object.

If the wall is vertical, it will not be affected.

Because friction f is the coefficient of dynamic friction multiplied by the pressure, there is no pressure on the wall against the wall, so there is no friction.

First of all, we're going to have to ask a language question about what it means to "lean" -- if I'm leaning back in a chair, there's no doubt that I'm strong against the chair and I'm standing next to the wall, which is something I can't do against the wall.

And secondly, what we're talking about here is that the vertical slide indicates that the wall is vertical, and then there's a question, when the object falls down the wall, it's subject to gravity, and what's the other thing, assuming that there's friction, there's going to be a pressure perpendicular to the wall, and in that case, the object must not be in equilibrium on the horizontal plane, and it's not going to slide vertically, so it's not going to be subjected to friction.

Having said so much, it is very simple to summarize First assume and then judge whether it matches the meaning of the topic I have also suffered a lot of losses in this area, I just hope that so much verbose will be useful to you.

There are three conditions for friction: roughness of the contact surface between two objects; There is mutual extrusion; There is a tendency to relative motion or relative motion. Here there is no mutual squeeze between the two objects, i.e. between the wall and the object, so there is no friction between the two.

Depending on the situation, if there is pressure acting on the object (e.g., pressing the object with your hand), the object is subjected to friction: vice versa, there is none.

f friction = u n

u is the coefficient of friction, n is the pressure).

All the great gods upstairs said that there was no friction, because there was no elasticity from the wall.

How can it not be elastic!! Consider a rod).

Assuming not, why did the center of mass of the object shift to the right?

Obviously, there is only one force in the horizontal direction! That's stretch!

First of all, we're going to have to ask a language question about what it means to "lean" -- if I'm leaning back in a chair, there's no doubt that I'm strong against the chair and I'm standing next to the wall, which is something I can't do against the wall.

And secondly, what we're talking about here is that the vertical slide indicates that the wall is vertical, and then there's a question that when an object falls down the wall, it's subject to gravity, and what else, assuming friction, there must be a pressure perpendicular to the wall, and in that case, the object will not be in equilibrium on the horizontal plane, let alone slide vertically, so if you do a chain overthrow, it won't be subjected to friction.

Having said so much, it is very simple to summarize Assume first and then judge whether it matches the meaning of the topic I have also figured out the meaning of the keywords in the title I have also suffered a lot of nonsense on this, and I just hope that so much verbose will be useful to you.

First of all, we're going to have to ask a language question about what it means to "lean" -- if I'm leaning back in a chair, there's no doubt that I'm strong against the chair and I'm standing next to the wall, which is something I can't do against the wall.

And secondly, what we're talking about here is that the vertical slide indicates that the wall is vertical, and then there's a question that when an object falls down the wall, it's subject to gravity, and what else, assuming friction, there must be a pressure perpendicular to the wall, and in that case, the object will not be in equilibrium on the horizontal plane, let alone slide vertically, so if you do a chain overthrow, it won't be subjected to friction.

Having said so much, it is very simple to summarize Assume first and then judge whether it matches the meaning of the topic I have also figured out the meaning of the keywords in the title I have also suffered a lot of nonsense on this, and I just hope that so much verbose will be useful to you.

When stationary. According to the force analysis.

The object is subjected to four forces, gravity, friction.

The elastic force and the pressure are equal in magnitude, and the vertical direction is balanced because it is stationary, that is, the friction force and gravity are magnitudes.

Target. When sliding at a constant speed, the horizontal is the same as when it is at rest, and the vertical direction is also subject to two forces, gravity and friction, because he is sliding at a uniform speed in the vertical direction, which means that the force is balanced in the vertical direction, and there is no acceleration.

So friction and gravity are equal. Both stationary and uniform motion are balanced by forces, and the force is what causes the acceleration of an object

From the perspective of Niu Yi, the equilibrium object is not subject to external forces, and the adherent stationary and uniform downward movement are in a state of equilibrium. Niu Er's way of looking at it is that the acceleration is zero, the external force is zero, the pressure is balanced with the elastic force of the wall, and the component of the alarm in the vertical direction is zero, and the component is zero, which means that there is no need to consider the influence of pressure elasticity on friction, and the gravity is unchanged, so no matter whether it is stationary or homogeneous, it is said that it is unchanged.

Constant velocity is the state of balanced sock rubber.

When the jujube is open at a constant speed, the vertical direction of the bench is only subject to two forces: gravity and friction.

It's sliding friction.

So gravity is equal to sliding friction.

Friction is not equal to the weight of the acre, and the spring field force will fall, and the fast shout will not be still.

If the frictional force is equal to the gravitational force, it cancels out the gravitational acceleration.

In order to achieve uniform cornering speed.

Because there is no solution, it is scientific.

In order to keep the object stationary or at a constant speed, one condition needs to be met, that is, the force is 0 for blind travel

That is, to maintain balance.

When sliding at a constant speed, you need to grind the reed to give him an initial velocity to achieve it!

For the analysis of the brick force, the vertical direction is subject to gravity, air resistance (generally negligible), and whether there is friction is to be determined.

If there is force in the horizontal direction, it can only be the supporting force of the wall, but if it is supported, there will be no balance between the force and the banquet finger in the horizontal direction of Yuxiang Sakura, and the object will have horizontal acceleration, which is obviously contrary to what is known. So it is not supported.

One factor that has friction is the presence of positive pressure (in this case, support), but it has been analyzed that there is none. Good clump so there is no friction.

So it is not subjected to force in the horizontal direction. In the vertical direction, only gravity (or air resistance) is applied.

If the brick is subjected to pressure in the horizontal direction, there is friction, and if there is no pressure clump, it is not subject to friction.

There must be positive stare pressure between objects rubbing against each other, which is one of the conditions of friction, so bricks and.

between the walls. The key to whether there is friction or not is to see if there is positive pressure between them and the oranges).

From the analysis of the problem, it can be seen that the pressure of the object on the wall n=f, then the magnitude of the grinding force contained in the frictional force of the object f= n= f The object slides down along the wall at a uniform speed, and the vertical direction is subjected to gravity and upward sliding friction

Therefore, c

f=g To ensure a uniform descent, the resistance should be equal to the gravitational force.

f= f is the drag coefficient.

It is not equal to, the force given by the hand is decomposed into two forces, horizontal and vertical, the horizontal component is equal to the supporting force, and the vertical component is equal to the sliding friction force.