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Anonymous users2024-02-07Experiment to study what factors are related to the magnitude of sliding friction: Why do you use a spring scale to pull a wooden block to do a uniform linear motion during the experiment? This is because the spring scale measures the amount of tension and not the amount of friction.
When the wooden block moves in a uniform linear motion, the tensile force in the horizontal direction of the wooden block and the frictional force of the wooden board on the wooden block are a pair of balancing forces. According to the condition of the balance of the two forces, the magnitude of the pulling force should be equal to the magnitude of the friction force. Therefore, the magnitude of the tensile force is measured, that is, the magnitude of the friction force is measured.
A large number of experiments have shown that the magnitude of sliding friction is only related to the amount of pressure and the roughness of the contact surface. The greater the pressure, the greater the sliding friction; The rougher the contact surface, the greater the sliding friction.
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Anonymous users2024-02-06Magnitude of friction = positive pressure * friction factor.
You have to know the formula, the amount of friction.
It is only decided to. Pairs of objects.
Contact surfaces. The amount of pressure applied and the smoothness of the contact surface are not related to the object's.
Speed of movement. Correlation.
Your first question:
You don't specify the size of the friction factor of your contact surface and the angle condition with the contact surface, so so.
No way for you. How much force does it take to move a 100n object? If you pull an object, if the object starts to move from rest, then your pulling force should be greater than the frictional force, after the object is moving, if the object remains accelerating, then your frictional force is less than your pulling force, if it is a constant velocity, then your frictional force is equal to the pulling force.
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Anonymous users2024-02-05There are two factors that affect the magnitude of friction:
1. The magnitude of friction is related to the pressure between the contact surfaces, and when the roughness of the contact surface is constant, the greater the pressure, the greater the friction.
2. The magnitude of friction is related to the roughness of the contact surface, when the pressure is constant, the rougher the contact surface, the greater the friction.
If lubricating oil, liquid, or gas flows along a solid surface, its velocity is reduced by friction. The structure of the solid surface has less influence on this frictional force, the most important being the cross-sectional area of the fluid. The reason for this is that there is friction not only at the interface between the fluid and the solid, but also between the different layers inside the fluid, and the flow velocity of the fluid is different depending on the distance from the solid surface.
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Anonymous users2024-02-04Chapter 7 Motion and ForceSection 6 "What is the magnitude of friction related to the student's experiment".
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Anonymous users2024-02-03The magnitude of friction is related to the degree of friction between objects and the magnitude of pressure.
Friction is the force that hinders the relative motion of an object (or the tendency to move relative to it) in the opposite direction to the object's relative motion (or tendency to move relative to it). There are three types of friction force: static friction, rolling friction and sliding friction.
When there is a relative tendency of motion between two objects, there is static friction between the two objects at this time, and it is generally believed that the static friction is slightly greater than the 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 higher the pressure, the rougher the contact surface of the rock object, and the greater the sliding friction generated.
The methods of increasing the favorable friction are: increasing the pressure, increasing the roughness of the contact surface, and the magnitude of the pressure. Ways to reduce harmful friction are: reduce pressure, make the object and the contact surface smooth, separate the object from the contact surface, change the slide to roll, etc.
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Anonymous users2024-02-02It is related to the coefficient of friction and mass.
First of all, please allow to correct you a mistake, or you are a slip of the tongue, the statement of inertial force is wrong, objects have inertia, and inertia is the property of an object. There is no such thing as inertial force. >>>More
The work done to overcome friction is the negative work done by friction. The force acts on a moving object, if the force does not decompose the projection in the direction of motion, it does not do work, if there is a projection direction that is consistent, it does positive work, and if there is a projection direction that is opposite, it does negative work. And the frictional force is opposite to the direction of relative motion, so the frictional force is to do negative work, and it can also be said that the moving object overcomes the frictional force to do work. >>>More
Static friction is related to tensile force, sliding friction. >>>More
The first question: if the pull does not move, it is 5n, and if the pull moves, it needs to be calculated according to the motion state. 2: >>>More
I think that the conditions provided by the title are wrong, use 2N to pull a wooden block to move in a uniform linear motion, and under the condition that other conditions remain unchanged, the tensile force is from 2N to 3N, and the object can no longer move in a uniform linear motion, but to do accelerated motion. >>>More