What type of friction does a person experience while walking? Direction? Analyse?

I think there are several situations: 1. Pacing.

2. Walk quickly.

3. Run. In addition, there is mountaineering and the like, because there are countless combinations of shoes and the ground, so it is not too complicated to analyze, and the following is only for the first case - the left foot and the right foot.

1. You are standing on the ground, now you are ready to walk, you adjust the center of gravity forward, at this time you lift your left leg, the right leg supports your weight, the upper of the right foot is relatively static with the ground, but you have begun to have a trend of movement, this is the static friction stage, the direction is the direction of your movement.

2. Your left heel is about to land, the heel of your right foot is raised, and the friction begins to change from static friction to sliding friction, which is characterized by the upper rolling over the ground in an arc, but this stage is generally static friction and the direction is forward.

3. Your left heel lands on the ground, and the left heel is static friction (slipping is sliding friction), and the direction is backward.

4. The center of gravity gradually transitions to the sole of the left foot, and the left foot contacts the ground in an arc and pushes forward, so that at the same time, the toe of the right foot and the ground begin to appear relative displacement (sliding), at this stage the left foot is rolling friction, and the toe of the right foot is sliding friction.

Maybe you don't understand 3 4 very well, the difference between sliding friction and rolling friction is the trend, for example, the friction between the bearing and the bearing is sliding friction, but the rolling of the round bar on the ground is rolling friction.

You can imagine the characteristics of rolling friction as follows: the object and the plane contact deform, when the object rolls forward, the bearing surface in front of the contact bulges to form a tiny bulge, and the point of action of the supporting surface acting on the object is offset by a small distance from the lowest point. It is this elastic force that produces a moment relative to the center of mass of the object that hinders the rolling of the object, which is the rolling friction force.

It's actually a very complicated process, and it varies from person to person, and it's a weird question, so that's it.

Static friction because your shoes do not slide relative to the ground.

Direction forward. You give the ground a backward friction force. Since the ox three you are subjected to a forward frictional force.

Static friction is in the same direction as the direction of human motion.

Because people are only subjected to static friction in the horizontal direction.

Therefore, it is impossible for a person to maintain a uniform speed during walking. Near constant velocity.

Static friction, which is the same as the direction of motion.

Friction is a relatively troublesome force in mechanics because it has a lot of content and a wide range in the college entrance examination. Through visual examples, we can understand the method of judging the direction of friction and the calculation of size.

When people walk, they are in contact with the ground, and when they are on the ground, they squeeze on the ground, and the friction between the feet and the ground, with the ground as a reference, and the direction of the feet is backwards, that is, the feet have a tendency to move backwards, so the friction of the feet is forward, and the people move forward under the action of this force.

The "four-step method" for determining the direction of friction is as follows:

1. Find out the object of friction.

2. Select the force object as the reference object.

3. Judge the relative direction of motion or the relative trend direction of the stressed object.

4. Use "opposite" to determine the direction of friction.

The direction of frictionThe direction of friction is for example, if an object is moving in a circle on a disk, the frictional force experienced by it is perpendicular to the direction of motion, but the direction of friction is opposite to the direction of the relative motion trend of the object and the disk.

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.

The detour is static friction.

Static friction (f) refers to the force that hinders the relative sliding between two objects in contact with each other when there is a tendency to slide relative to each other, but when they are still relatively stationary. Static friction can be either drag or power, and moving objects can also be subjected to static friction. When a person walks, there is no relative sliding between the soles of the feet and the road surface (under normal circumstances), so it is called static friction.

Friction refers to the obstruction of the relative motion of an object.

or relative movement tendency). 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 walking forward, the frictional force is in the direction backward and is static friction. When you walk forward, although your foot is moving forward, there is no backward force on the ground, and the ground prevents your foot from slipping backwards, so it has a forward static friction on the sole of your foot.

You can simulate that if you push your feet backwards on the ground at a smooth point, your feet tend to slip backwards, so the ground will have a forward sliding friction on the soles of your feet.

Our common wrestling, such as running too fast on a snowy day, wants to stop suddenly. At this time, it is easy to fall backwards, because the foot slides forward quickly, and the friction is backwards, but the body will fall backwards due to inertia and the movement when you suddenly stand up.

Friction has a lot of content and a wide range in the college entrance examination, and it is a relatively troublesome force in mechanics. Through the example of the image, we can understand the method of judging the direction of friction and the method of calculating the size of the bridge.

When a person walks in front of the Ant Yuanchun, the direction of friction is (). Stuffy.

a.Back. b.Forward.

c.Pure left to the split.

d.Rightward. Correct answer: B

Correct Answer: Static friction.

On the first floor, it is not correct to say that "the force of the human foot pushing backward on the ground is its equilibrium force", this force is the force on the ground, and the friction force mentioned in the title is the force rented by the human foot. How do you balance two forces that are not on the same object?

Walking is actually a very complicated process. Starting from the first step, the person is originally stationary, and the back foot is on the ground, so the ground gives the back foot bucket silver talk a forward static friction force, so that the person can accelerate forward, and at the same time the center of gravity moves forward.

But because the ground is not smooth, people will be subjected to frictional resistance given by the ground when they move forward (otherwise, as long as they start, they will keep sliding forward, and there is no need to continue to walk), and this is still static friction (because people's feet do not slip on the ground).When the person is hindered by this static friction, the speed decreases, so the person needs to take a second step to repeat the acceleration process above.

Therefore, people move forward with repeated acceleration, deceleration, acceleration, and deceleration. It is not a constant collision with a uniform linear motion. Under what circumstances can it be said that people move at a uniform pace? Unless the person is subjected to a forward force and glides forward on a smooth horizontal surface.

If we have to look at it as a whole, then the two forces that balance each other are the static friction that makes people move forward and the static friction that hinders people from moving forward. But in fact, these two static friction forces appear in sequence, so they cannot be said to be a pair of balanced forces.