Superimposed object friction problem, the frictional force between two objects

An object is superimposed on another object, and if one of the objects below is subjected to a force and does not move, the object below is subjected to static friction, and the object above is not subject to friction but only gravity and support. If it moves, if the upper and lower objects are relatively stationary, but the lower objects are subject to sliding friction, and the upper objects are still under the force and move relatively, both are subject to sliding friction, and the lower objects are subject to two, and the upper objects are subject to one sliding friction If the upper objects are subjected to force, the first question Both objects are subject to static friction The second question The upper and lower objects are subject to friction, and the upper ones are subject to static friction, and the lower two are collected, one is static friction, and one is dynamic friction The third question is the same as the third answer to the above question.

When it doesn't move: the friction below is in the opposite direction to the force it is experiencing Moving, relatively stationary: The friction above is in the opposite direction of motion Remember, the friction is in the opposite direction of the force, and it is to keep the object as stationary as possible.

There are two overlapping objects on the ground, and now the one below is pulled to the right with a force of 10n, (both objects are moving in a uniform straight line to the right at the same time.)

The two objects remain relatively stationary all the time, regardless of the air resistance.

Find the force on the object above (if the force is applied, find the magnitude, if not, the reason), then find the force on the object below, and find the friction force on the ground against the object below.

What is the size? I read that the reference book says that the friction of the object above is 0n, and the friction of the ground against the object below is 10n.

This kind of problem needs to be analyzed separately and forced. It's simple.

Consider the ab2 objects as a whole by the pull of the horizontal right five bulls and the horizontal right four bulls respectively. Because AB is at rest as a whole, it can be known that the system as a whole is thin to the ground. The static friction of a bull to the left horizontally.

So it can be known that the C answer is correct. Then separate B and A. Consider it individually. Perform a force analysis.

Then the friction between AB can be known to be equal to four ox. A has a static friction of four bulls horizontally to the left against B.

Answer: This question uses physics knowledge such as "the balance of forces on stationary objects", "the equilibrium force is equal", and "the interaction force is also equal".

As long as the horizontal force balance is analyzed, the result can be obtained:

If the above object A is at rest, then A is balanced horizontally by a pulling force f to the left and a static friction force to the right exerted by object B. So, f = f = 4n

Since the action of the force is reciprocal, A also exerts a leftward static friction force on B, which is also 4N.

b is balanced by three forces in the horizontal direction, so that the ground has a static friction force of 1n to the left on b.

The friction between AB can only be analyzed A, and A is at rest indicating that the force is balanced, and the frictional force is equal to the magnitude of F1 in the opposite direction.

When it doesn't move: the friction below is in the opposite direction to the force it is experiencing Moving, relatively stationary: The friction above is in the opposite direction of motion Remember, the friction is in the opposite direction of the force, and it is to keep the object as stationary as possible.

Summary. The friction between overlapping objects refers to the force generated at the point where two objects come into contact with each other's surfaces when they squeeze or slide against each other. In physics, transverse friction, also known as viscous friction or modulus friction, is a force that prevents an object from moving in a relatively sideways direction.

The magnitude of the transverse friction depends on the roughness of the surface of the object, the contact area, and the surface properties. In addition, the lateral friction force is also affected by the vertical pressure between the objects (perpendicular to the contact surface). Transverse friction is used in a wide range of applications, such as braking systems, motion devices, and lubricating materials.

I'm still a little confused, can you be more detailed?

The friction between overlapping objects refers to the force generated when two objects touch each other's surfaces when they squeeze or slide against each other. In physics, transverse friction, also known as viscous friction or modulus friction, is a force that prevents an object from moving in a relatively sideways direction. The magnitude of the transverse friction depends on the roughness of the surface of the object, the contact area, and the surface properties.

In addition, the lateral friction force is also affected by the vertical pressure between the objects (perpendicular to the contact surface). The application of transverse friction is widely speculated, such as the influence of transverse friction in braking systems, motion devices and lubricating materials.

Hello, it is a pleasure to serve you and give you the following answer: different objects have different friction forces. The friction depends on the roughness of the surface of the object, the material of the object, and the contact area between the objects.

To solve this problem, it is first necessary to determine the material of the object, then to check the surface roughness of the object, and to determine the contact area between the objects and the collapse. If the surface roughness of the objects varies, sandpaper or other abrasive tools can be used to smooth the surface to reduce friction. If the material of the object is different, lubricants can be used to reduce friction.

If the contact area between the objects is different, a spacer or other pad can be used to increase the contact area to reduce friction. Personal tip: When solving friction problems, carefully inspect the material, surface roughness and contact area of the object in order to find out the cause of friction and take appropriate measures to reduce friction.

Summary. Hello, it is a pleasure to serve you and give you the following answer: The clinging friction of different objects is different because of their different surface structures and materials.

To solve this problem, we must first determine the amount of friction, and then choose the appropriate friction agent according to the actual situation. 1.First of all, to determine the magnitude of friction, a friction measuring instrument can be used to measure friction.

2.Then, choose the appropriate friction agent according to the actual situation. In general, lubricants can reduce friction, while anti-friction agents can increase friction.

3.Finally, the friction agent is applied to the surface of the object to achieve the desired friction force. Personal Tips:

When using friction agents, it is necessary to pay attention to the type of friction agent and the amount of friction applied to avoid affecting the amount of friction.

Hello, it is a pleasure to serve you and give you the following answer: The clinging friction of different objects is different because of their different surface structures and materials. To solve this problem, we must first determine the amount of friction, and then choose the appropriate friction agent according to the actual situation.

1.First of all, to determine the magnitude of friction, a friction measuring instrument can be used to measure friction. 2.

Then, choose the appropriate friction agent according to the actual situation. In general, lubricants can reduce friction, while anti-friction agents can increase friction. 3.

Finally, the friction agent is applied to the surface of the object to achieve the desired friction force. Personal tip: When using friction agents, pay attention to the type of friction agent and the amount of friction source slip rubbing agent, so as not to affect the amount of friction.

Can you elaborate on that a little bit more?

Hello, it is a pleasure to serve you and give you the following answer: The clinging friction of different objects is different because of their different surface structures and materials. To solve this problem, we must first determine the amount of friction, and then choose the appropriate friction agent according to the actual situation.

1.First of all, to determine the magnitude of friction, a friction measuring instrument can be used to measure friction. 2.

Then, choose the appropriate friction agent according to the actual situation. In general, lubricants can reduce friction, while anti-friction agents can increase friction. 3.

Finally, the friction agent is applied to the surface of the object to achieve the desired friction force. Personal tip: When using friction agents, pay attention to the type of friction agent and the amount of friction source slip rubbing agent, so as not to affect the amount of 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.

There are three types of friction: static friction, 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. The magnitude of sliding friction is related to the magnitude of the roughness of the contact surface and the magnitude of the pressure. The greater the pressure, the rougher the contact surface of the object, and the greater the sliding friction generated.

A pulling force is applied to the above, and a frictional force is applied to the bottom.

However, the force is applied to the lower part and the linear motion is maintained at a uniform speed.

, the upper one is not affected by the frictional force. In fact, at the moment when they first started moving, there was friction, and it was this friction that changed the motion of the hollow object above. But when it starts to move at a constant velocity, the frictional force disappears and the motion can continue because of the inertia of the object above.

A hypothetical force analysis can be performed on the above object.

If it is subjected to friction, then there is a force that balances with friction, and this force cannot be found, so there is no friction.

The first case: there is friction.

The object above remains at rest, indicating that it is acting on a balanced force, i.e., the object below exerts a frictional force of different magnitude equal to the force f and in the opposite direction on the object above.

The second case: there is no friction.

Because the above object maintains a uniform linear motion, it means that it is affected by the balancing force, while the horizontal direction is not subject to external force, so there is no frictional force.

The reason why we move forward is because of inertia. (Force is not what sustains the motion of an object).

1. There is friction.

2. Although the object below is pulled, the object 2 is moving at a uniform speed, and the object above is also a hunger mode at a uniform velocity, and there is no force in the horizontal direction, and of course there is no friction.

If the object below is pulled, the object above will be subject to friction if the object is moved at a variable mega clear velocity. If the acceleration of the variable speed movement is too large, the object above will fall down in front of the limb because the friction is not large enough, or if it does not fall, the acceleration cannot be greater than g*friction coefficient u

The upper block moves to the right, and the friction between the upper block and the lower block prevents the upper block from moving, so the direction is to the left. The reaction force (also friction) of the upper block to the lower block is equal in magnitude and in opposite directions. Since the support surface is smooth, this rightward friction moves the union to the right.

It is important to point out that friction does not occur out of thin air, because the small wooden block is subjected to a force to the right. This force is the driving force behind the whole movement.

That is, the friction force of the wood block below to the left is only the obstruction of the wood block above, because the friction of the wood block above will cause the wood board below to suffer a friction force to the right. ps: (The action of force is mutual).