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The frictional force of the three important forces – static friction.
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You're talking too widely! For example, without friction, a vehicle cannot run! There is no friction.
Without friction, the ping pong ball won't spin! Then it won't be exciting! Not to mention football.
Well, that's all! Without friction, the feeling between men and women is not so good. Hey!
Life is full of knowledge, good luck.
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Examples of friction in life are:
1. Brake: Whether it is a bicycle or a car, it is related to friction when braking, the greater the friction, the greater the resistance, and the better the braking performance.
2. Soles: Our soles have a variety of anti-slip designs of different shapes, which is to increase friction, so that we are not so easy to slip in the process of walking.
3. Ice skating: When skating, whether it is skates or skates with pulleys, the friction between the shoes and the ground is reduced as much as possible, and the smaller the friction, the smoother we slide.
4. Curling: Curling is a throwing competition, the two sides of the game can adjust their throwing strength by using friction, and after throwing, change the ground friction as needed, so as to change the direction of the curling and make the curling reach their ideal destination.
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1: There are some vertical lines on the plastic bottle cap to increase friction.
2: After wearing a mechanical watch for a long time, oil it to reduce friction.
3: The car is stuck in the mud, and the grass is put on it to make the car come out and increase the friction.
4: In the belt drive, tighten the belt and apply "belt wax" on the belt to increase friction.
5: Install rolling bearings and lubricating oil in the rotating part of the machine to reduce friction.
6: The pattern on the wheel increases the friction.
7: Maglev train to reduce friction.
8: Apply rosin to the erhu bow to increase friction.
9: The wheels are rounded to reduce friction.
10: Walk on roller skates to reduce friction.
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1. There are some vertical lines on the plastic bottle cap to increase friction;
2. After wearing a mechanical watch for a long time, oil it to reduce friction;
3. The car is stuck in the mud and the grass is put on the pad to make the car drive out and increase the friction;
4. In the belt punching lead transmission, tighten the belt and apply belt wax on the belt to increase the friction;
5. Install rolling bearings in the rotating part of the machine, and add lubricating oil to reduce friction;
6. The pattern on the wheel increases the friction of the forest rent;
7. Maglev train to reduce friction;
8. Apply rosin to the bow of this Zhao Erhu to increase friction.
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The application of friction in the life of the state of the reed:
1. There are some vertical lines on the plastic bottle cap to increase friction;
2. After wearing a mechanical watch for a long time, oil it to reduce friction;
3. The car is stuck in the mud and the grass is put on the pad to make the car drive out and increase the friction;
4. In the belt drive, tighten the belt and apply belt wax on the belt to increase the friction;
5. Install rolling bearings in the rotating part of the machine, and add lubricating oil to reduce friction;
6. The pattern on the wheel increases the friction of the tape;
7. Maglev train to reduce friction;
8. Apply rosin to the bow of the erhu to increase friction.
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Sliding friction: It can generate the reaction force that people need, such as shoes rubbing against the ground to make people move forward; The tires rub against the ground, and the car starts; Brush the floor to remove dirt. Rolling friction:
Reduces the wear effects of friction, such as small balls in bicycle axles; The use of rolling wood when carrying heavy loads in ancient times. Static friction: fixing an object to prevent movement when it is affected by other forces, such as chopsticks picking up food; The robotic arm of the game console picks up the doll; Knotted rope.
1. Sliding friction: It can produce the reaction force that people need, such as the friction between shoes and the ground, so that people can move forward; The tires rub against the ground, and the car starts; Brush the floor to remove dirt.
2. Rolling friction: reduce the wear effect caused by friction, such as the small ball in the bicycle axle; The use of rolling wood when carrying heavy loads in ancient times.
3. Static friction: fix the excited object to prevent the movement of the object when it is affected by other forces, such as chopsticks picking up food; The robotic arm of the game console picks up the doll; Tie Li Xi's rope.
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Benefits of Friction:
1. Sliding friction: It can produce the reaction force that people need, such as the friction between shoes and the ground to make people move forward;
2. Rolling friction: reduce the wear effect caused by friction, such as the use of rolling wood when carrying heavy objects in ancient times;
3. Static friction: fixes the object to prevent the movement of the object when it is affected by other forces, such as chopsticks picking up food.
Disadvantages of friction:
1. Sliding friction: causing wear and tear of objects, such as tire parts;
2. Rolling friction: it cannot produce a large enough reaction force, for example, it is difficult to drag the animal body when wearing skates;
3. Static friction: increase the resistance during movement, such as the rusty wheel of the collapsed ant cannot be rotated.
This question should be considered in two processes:
1.Because when only F1 is added, the object moves in a uniform straight line to the east, so the sliding friction is 10N to the west, remove F1, and add F2 until the object velocity is 0, the object velocity direction remains unchanged, so the sliding friction of the object is still 10N to the west. >>>More
It's not hard to figure this out.
In the case of straight pulling, the tensile force f1=umg=f used to reach the critical state, where u is the critical static friction coefficient, m is the cement mass, g is the gravitational acceleration, and f is the maximum static friction. >>>More
Please note that this is junior high school physics and does not involve friction coefficients. >>>More
In this case, the frictional force and the direction of motion of the object are not perpendicular to the work.
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