On the issue of friction of bicycle wheels

You're right, don't care what everyone says.

Rolling is a compound motion of translation and rotation, therefore, when judging by the composite mode, the direction of friction caused by translation is opposite to the direction of rolling; The direction of the frictional force caused by the rotational action is the same as the direction of rolling. The rear wheel of the bicycle is a compound motion caused by turning, so the direction of friction is the same as the direction of rolling; The front wheel is a compound motion caused by translational motion, so the direction of friction is opposite to the direction of rolling. When not pedaling, due to inertia, the two wheels still maintain their original motion state.

For example, if you lift the rear wheel off the ground, shake the pedals, rotate the rear wheel, and then make it contact with the ground, the bike will move forward. You will find that the dust or small grains of sand under the wheel are thrown backwards, i.e. the wheel has a backward force on the ground.

Therefore, the ground has a forward force (friction) on the wheel

Therefore, it is not correct to say that the friction of the bicycle is always backward when it is subjected to the ground.

The effect of pedaling and not pedaling is of course not the same, when not pedaling, both wheels are passive wheels, the movement relies on inertia, the friction force is backward, the rear wheel is the driving wheel when pedaling, the front wheel is the driven wheel, the front wheel friction force is backward, the rear wheel friction force is forward, and the rear wheel friction force provides the force to maintain forward motion.

When we ride on a bicycle, there is friction between the bicycle and the road surface because the person and the bicycle have pressure on the ground, and the tire and the ground are not smooth, but why does the bicycle move forward? This is still generated by the friction between the rear wheels and the ground, and the direction of this friction is forward, which can also be understood as the friction that makes the car move forward.

So what does the friction of the front wheel do? Hinder the movement of the car! It goes in the opposite direction to the direction in which the bicycle is traveling. It is these two forces that are equal in magnitude and opposite in direction, so the bicycle moves at a uniform speed.

However, when people push their bikes forward on the ground, the direction of friction between the front and rear wheels is backwards. So who is in balance with these two forces? The friction of the foot against the ground forward!

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Is the friction on the front and rear wheels of the bicycle the same?

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Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions! Not the same as big 1The rear wheels of the bicycle are the driving wheels, and the friction is relatively large.

2.The front wheel of the bicycle is just the driven wheel, which belongs to rolling friction. And the force is relatively small.

Normally, the rear tires wear out faster than the front tires.

The friction of the two wheels of a bicycle is inconsistent, and the load bearing of the rear wheel is generally greater than that of the friendly section, so the friction of the rear wheel is greater. The friction on the front wheels prevents the car from moving forward, and the direction is backward, which is rolling friction. When riding, the rear wheel is subjected to the friction of the good attendant to cause the bike to move forward, and the direction is forward, which is static friction.

The rear wheels have a larger load-bearing capacity and have to overcome the resistance of the front wheels, so the friction of the rear wheels is larger. The car can move forward, theoretically in the march, when the rear wheel is smaller than the front wheel, do deceleration motion; When the rear wheel is equal to the front wheel, the velocity is constant; Larger than the front wheels, acceleration. In fact, if the rear wheel is equal to the front wheel, the car will slow down and stop; Therefore, regardless of whether the car is accelerating or at a constant speed, the friction of the rear wheels is greater than that of the front wheels.

This issue should be discussed on a case-by-case basis.

If the bicycle is pushed, the relative movement of the front and rear wheels relative to the ground tends to be forward, i.e. the friction of the front and rear wheels is backward.

If the bicycle is ridden, the relative movement of the front wheels relative to the ground is still forward, the same as being pushed, and the friction is still backward. The rear wheels are to rotate on their own (as opposed to pushing a bicycle), and the relative movement of the ground tends to be backwards, so the friction on the rear wheels is forward.

The front wheels are backward and the rear wheels are forward.

How to judge the direction of friction between the front and rear wheels of a bicycle? Teach you two of the easiest ways to use.

When driving hard and pedaling forward, the front wheel of the bicycle is the driven wheel, and the rear wheel is the driving wheel, and the driving wheel provides power for the bicycle to move forward; When the bicycle slides, the front and rear wheels of the bicycle are driven wheels;

Because it is rear-wheel driven, the rear wheel is subjected to the friction force of the ground facing it forward, while the front wheel, which is not the driving wheel, is pushed forward by the rear wheel, moving forward relative to the ground, and is subjected to the friction of the ground facing it backwards

When the bicycle pushes hard and moves forward, the rear wheel has a backward movement trend relative to the ground, so the friction on the rear wheel is forward; The front wheels use the friction of the ground to slide, so the friction experienced by the front wheels is backwards;

When the bicycle slides, the front and rear wheels of the bicycle are driven wheels; Both use friction to coast, so the friction on both the front and rear wheels is backwards

Because if you want your bike to move forward, you have to be affected by force! And the only external force acting on the bicycle is friction (except, of course, when you push the bicycle with your hands).

Because you are going forward, all the frictional force f should be forward! (because the object is moving in the same direction as the force being applied).

The rear wheels of the bicycle are the driving wheels and will experience the friction force forward, and the front wheels are driven wheels, and on the contrary, the friction of the rear wheels is greater than that of the front wheels .

It is equivalent to that when a person walks on the ground, he must be subjected to forward friction, and if you kick the ground backwards, the ground in turn will give you forward friction!

Hehe, I don't know if it's clear).

The front wheel is generally driven by the wheel!

The rear wheels push the front wheels, just like a person pushing a box! Friction is naturally opposite to the direction of motion!

The rear wheels should not be said to be rearward-facing relative to the ground! Rather, it should be said that there is a backward trend of movement, and the direction of friction is opposite to the direction of the movement trend!

Because friction and the direction of movement are opposites (the basic idea of friction, you have to listen carefully in class, the teacher must have talked about it!) ）

The direction of friction is opposite to the relative direction of motion of the object or the direction of the relative movement trend, and the relative motion here refers to the movement of the point on the bicycle wheel that is in contact with the ground relative to the ground, so to judge the direction of friction is to see the point on the bicycle wheel that is in contact with the ground relative to the direction of movement of the ground, and the direction of friction is opposite to this direction. It's a bit awkward, but it's a good experience.

Look at the rear wheel first, the rear wheel is the driving wheel, the point of contact between the rear wheel and the ground can not see the relative motion, if you turn the pedal, imagine that the ground is smooth, the point of contact between the rear wheel and the ground is relative to the ground is backward movement, so the friction of the rear wheel is forward.

Look at the front wheel, the front wheel is driven wheel, assuming that the ground is relatively smooth, if the bicycle is moving forward at a large speed, suddenly the front wheel brakes sharply, the front wheel is locked and does not turn, the whole body slides forward, the front wheel and the ground contact point is relative to the ground forward, so the rear wheel friction forward.

The front wheels of the bike are pulled backwards and the rear wheels are forward!

It's probably easy to understand this way: first of all, imagine that the ground is smooth, what happens when you ride a bike?

1. Because the rear wheel is a driving wheel, it is rotating. From the ground point of view, the point on the rear wheel that is in contact with the ground moves backwards;

2. The front wheel does not move.

Back to the actual situation:

1. The rear wheels move backwards relative to the ground, so the ground gives forward friction. If the ground friction is large enough (the rear wheel does not slip at this time), and you have been riding, the linear velocity of the point on the rear wheel in contact with the ground is the same as the overall forward velocity of the bicycle, and the relative total combined velocity with the ground is zero, so this point is relatively related to the ground only has a backward movement tendency, and is subject to forward static friction.

2. The front wheel is a driven wheel, which moves forward passively. The point on the front wheel that is in contact with the ground moves forward with respect to the ground and is therefore subject to a backward friction force.

Please consider the situation you envisioned at the beginning.

I'll explain it to this extent first, and I won't go into details. You are welcome to ask questions again.

The front wheel friction is backward and the rear wheel friction is forward.

How to judge the direction of friction between the front and rear wheels of a bicycle? Teach you two of the easiest ways to use.

Friction does have beneficial friction and harmful friction, but it is a bit arbitrary to treat the friction on the front wheel of a bicycle as harmful friction and the friction on the rear wheel as beneficial friction. Personally, I believe that as long as there is friction, it will cause wear and tear on the contact of the object, that isAll friction is harmful。However, people can't do without friction, and there are many jobs that need to be done by friction, in this senseThe friction that people need is the friction that is beneficialFriction that people don't need and can't avoid is harmful friction.

According to this, let's take a look at the bicycle, the front wheel is the guide wheel, when driving in a straight line, the friction hindered the forward movement of the front wheel, which is harmful friction; When cornering, friction from the ground prevents the front wheels from slipping sideways and provides centripetal force, which is beneficial friction. The rear wheel is the driving wheel, and when the person pedals hard, the friction of the ground makes the rear wheel advance, which is beneficial friction; When a bicycle slides forward by inertia, the friction of the ground hinders the forward movement of the rear wheels, which is harmful friction. And when braking, the friction on the front and rear wheels hinders the bicycle from moving forward, which is beneficial friction.

As for the wheelbarrow, I just saw others ride, I didn't experience it personally, I feel that no matter forward or backward, people have been pedaling hard to get the friction of the ground, of course, when cornering, the same as ordinary bicycles, also need the friction of the ground anti-skid, so the friction of the wheels of the unicycle is beneficial friction.

Who is so "friction"! Children, if there is no friction on the front wheels, how can you control the corner? If there is no friction on the rear wheels, then you have to do the unicycle balancing!

Your question, personal estimate, the focus of your question is on the balance of the vehicle, the front wheel of the bicycle is the steering wheel, the rear wheel is the driving wheel, from the perspective of automatic safety of the brake, it is definitely beneficial to give the rear wheel friction to the brake, and the front wheel will have an impact on the direction of progress due to friction during driving, in other words, it is the harmful friction you are talking about. Therefore, the identification and action of the two wheels after being subjected to friction depends on the situation.

Rear-wheel drive is the case you are talking about, and the reaction force between the rear wheels and the friction on the ground drives the car forward, so it is called beneficial friction, and the front-wheel drive car is just the opposite.

I don't know what I mean, am I alone?

It's all useful friction, otherwise how do you control the direction.

It's like if you're pushing a person to walk, compared to if you're walking alone.

The former consumes more physical strength than the latter.

Friction is beneficial and harmful, simply set car tires, take most four-wheeled cars as an example, the car is narrow, start fast, run fast, but also fuel-efficient, but the grip is small, the car is not stable, the braking force is poor, easy to accident, the tire is wide just the opposite.

The direct friction between the tires and the ground is beneficial, and the wheel shaft is harmful friction, regardless of the front and rear wheels.

He may mean that you don't understand, or maybe I don't understand, I used to ride a bicycle, and I also found that there are traces of friction on both sides of the front wheel, I don't know why, I must have touched nothing on the bicycle itself,