Are objects on the conveyor belt rubbed against the conveyor belt?

It depends on several situations, one is whether the conveyor belt is at a constant speed, and the other is whether the conveyor belt is horizontal or inclined conveyor. If it is an inclined conveyor, and the object is stationary relative to the conveyor belt, then the object must be subjected to friction, and the direction of friction is upward along the inclined plane. If it is transmitted horizontally, and it is at a constant speed, then the object is not affected by friction, if it is not at a uniform speed, then the object is still affected by friction, as for the direction, it depends on whether the conveyor belt accelerates or decelerates, if it is accelerated, the friction is forward, and vice versa, it is the opposite.

Constant motion, the state of motion of the object does not change, if it is not uniform, then under the action of friction and other forces, the state of motion must of course change.

Any object that comes into contact with other objects will be subjected to frictional forces, and conveyor belts are no exception because there is no such thing as a completely smooth object. So the objects on the conveyor belt will also be rubbed by the conveyor belt. It is this friction that changes the state of motion of the objects on the conveyor belt.

Actually, force is what changes the motion of an object, and if the force experienced by the object is not a pair of balanced forces, no matter what the force is, even if it is not frictional, its state of motion will change.

Yes. If he hadn't been rubbed. will just stay where it is.

If an object is not subjected to friction, why does the state of motion change?

I don't understand this sentence, but he can also be affected by pull, gravity, thrust.

Of course, the state of movement will change.

The tendency of motion (which can be considered as acceleration) is in the same direction as the resultant force of the object and inversely proportional to the mass, and the frictional force is generally a component force, and the change in the state of motion should be seen as the resultant force.

It is not subject to friction if it is moving at a constant speed or at rest, and it is subject to friction if it is motion with non-zero acceleration.

The question you are asking is too broad, there are many kinds of conveyor belt questions, and there are many additional conditions! ~

1. The speed of the object is less than the speed of the conveyor belt, the direction of the friction force of the object is consistent with the direction of movement, and the object accelerates the movement;

2. The velocity of the object is equal to the speed of the conveyor belt, and the object is not subject to friction;

3. The speed of the object is greater than the speed of the conveyor belt, the direction of the friction force of the object is opposite to the direction of movement, and the object decelerates the motion

The above is for the horizontal conveyor belt

The object on the conveyor belt is subjected to the same direction of friction as the rough limb object, and for the object, the friction is the driving force and does positive work.

If the negative segment letter function is represented by a negative number, and the positive function is represented by a positive number, the algebraic sum of the positive and negative work above is still a negative number, that is, the heat generated by friction in the whole motion process, the conveyor belt does work on the object, and the object does work on the conveyor belt. If the mechanical energy is conserved, then the two works should be equal;In fact, there is a difference between the two works, and this difference is the internal energy.

Let the conveyor belt be x1 relative to the ground and the block be x2 in relation to the groundThe frictional force is f;

The conveyor belt does work on the block w2, the block does work on the conveyor belt w1, and the system increases the internal energy to q. According to the functional principle of the system, there is w1 - w2 = q, that is, f ( x1 - x2 ) q

Therefore, the increase in internal energy of the system is equal to the relative displacement multiplied by the frictional force.

Air resistance and other external forces are not taken into account, and the object and the conveyor belt are relatively stationary

Moves at a constant speed on a horizontal conveyor belt without friction;It moves at an uneven speed on the horizontal conveyor belt and is subject to static friction;Moves at a constant speed on a non-horizontal conveyor belt and is subject to static friction;Non-uniform motion on non-horizontal conveyor belts, not necessarily.

According to Newton's first law, an object always has the property of maintaining a stationary or uniform linear motion when it is not balanced by an external force or force.

Moving at a constant speed on a horizontal conveyor belt means that the force in the horizontal direction is 0

The uneven motion on the horizontal conveyor belt means that there is an external force that changes its state of uniform linear motion, so it is subject to static friction.

It moves at a uniform speed on a non-horizontal conveyor belt, is subject to static friction, and is subject to the component of gravity along the direction of the conveyor belt, so it is necessary to balance the component of friction and gravity.

On a non-horizontal conveyor belt, non-uniform motion may be caused only by gravity, which is uncertain.

If the velocity of the object does not match the velocity of the conveyor belt when it first comes into contact with the conveyor belt, there will be sliding friction between the conveyor belt and the object;After that, the velocity of the object is the same as the speed of the conveyor belt, and there is static friction between the conveyor belt and the object.

At first, it is sliding friction, and there may be static friction after the common velocity is reached.

The friction when an object is just placed on a conveyor belt is sliding friction.

When the object is just placed on the conveyor belt, the velocity of the object accelerates from 0 under the action of the tensile force and friction force of the conveyor belt, and then there is sliding friction on the contact surface between the object and the conveyor belt, and the direction of the sliding friction force is the same as the direction of the object's movement, and the sliding friction force gradually decreases with the acceleration of the object;

When the object accelerates to the same speed as the conveyor belt, that is, the object reaches the equilibrium state, ignoring the air resistance, the object continues to maintain the same speed and direction of motion with the conveyor belt due to inertia, which belongs to a relatively stationary state, and the sliding friction force exerted to the object by the conveyor belt is no longer required, and the sliding friction force is reduced to 0, that is, static friction.

In this case, when you first put it in, it's subject to sliding friction, because the initial velocity of the object is zero, and it's subjected to the friction in the direction of the direction, and then the object is not affected when it is at the same speed as the conveyor belt, and they are the same frame of inertia, which can be seen as not being forced.

1.There are three types of stationary on a conveyor belt.

The conveyor belt is stationary, frictionless!

The conveyor belt moves at a uniform speed without friction!

The conveyor belt accelerates in a linear motion, and the friction force is in the same direction as the acceleration!

2.Make an acceleration motion on the conveyor belt.

The object is stationary relative to the conveyor belt, the acceleration of both is the same, and the object is only subjected to friction in the horizontal direction.

Friction provides acceleration, so it's in the same direction as acceleration!

3 If the conveyor belt accelerates forward, then the object will also accelerate with it, and only the friction force is applied horizontally, if the friction force is backward, then who will provide the acceleration?

Contradicts physical facts. So the friction force cannot be backwards.

Air resistance and other external forces are not taken into account, and the object and the conveyor belt are relatively stationary

Moves at a constant speed on a horizontal conveyor belt without friction;

It moves at an uneven speed on the horizontal conveyor belt and is subject to static friction;

Moves at a constant speed on a non-horizontal conveyor belt and is subject to static friction;

Non-uniform motion on non-horizontal conveyor belts, not necessarily.

Surely there is no friction, you are in the third year of junior high school, right? I just graduated from junior high school, believe me, the first time I did this question, I thought it was also subject to friction, but later when the teacher commented, he said that he didn't want it, and then I did this question many times, but I didn't accept it.

Reason: The object on the conveyor belt moves at a constant speed in one direction, then it is balanced by force in the horizontal direction (two forces balance) or not forced, and the horizontal conveyor belt has no power for it, that is, if it is subjected to a frictional force, it cannot move at a uniform speed on the conveyor belt. So it is not subject to friction.

I hope you can read it carefully.