Why a sofa is more comfortable to sit on than a bench Please explain it from the perspective of phys

The inside of the sofa chair is equipped with a sponge or spring, which is very soft, and after a person sits on it, the back, hips, thighs and even the head can be in contact with the chair, so that the contact area between the human body and the sofa is relatively large. And what about the strip bench? It is generally made of wood, with a flat surface and no backrest.

When seated, only part of the buttocks can come into contact with the bench. It has a much smaller contact area than an armchair.

In this case, since the person is an elastomer, the pressure on the sofa chair and the bench is equal to the weight of the person itself, which is an invariant, according to the action of the forces between the objects is mutual, so the pressure on the sofa chair and the bench is also an invariant.

From the definition of pressure (the pressure on the unit area of the object is called pressure), we can deduce the formula for calculating pressure: pressure = pressure area, we can know which of the two is the pressure on the human body. According to the principle of specific size in arithmetic (a tree with the same numerator and a large denominator is smaller), we come to the following conclusions:

The pressure on the human body is less than that of a bench with a sofa chair with a large contact area with the human body.

What is the relationship between the amount of pressure and the sensation of the human body? Pressure is a measure of the deformation effect produced by pressure. When sitting on a bench, the human body is under strong pressure and the degree of muscle compression is high, so it is easy to get tired; When sitting on a sofa chair, the human body is under less pressure and the degree of muscle compression is low, so it feels comfortable.

Whether it is comfortable or not depends on the size of the contact area between the person and the chair, not on the geology of the chair. Think about it: if it is a wooden chair, and its surface and back are dug into a concave shape according to the contour of the person's shape, so that people can sit on it "tightly and seam", I think it will also have the effect of a sofa chair.

The sofa is very soft, and the contact with the person after sitting on it is large. In a certain situation, the pressure is small, and the person will feel very comfortable. When sitting on the bench, the contact area is small, the pressure is strong, and it feels uncomfortable.

C is chosen for this topic, because according to the pressure p=f s, when the force f is constant, the contact area of the person sitting on the sofa is larger than that of sitting on the bench, so the pressure will be smaller, so it will be more comfortable to sit on the sofa.

The design principle of the sofa is different from that of the chair, sitting on the chair does not tilt the body as much as the sofa.

And the sofa is generally lower than the chair to sit high, so that the legs have a relaxed posture.

At the same time, the sofa has a spring and a relatively thick sponge, which has a support for the body and a ** support at the same time.

The number of discomforts is not strained on the spine. The sea surface of the sofa is scattered in all directions, and it is not concentrated on the spine. Pressure and pressure seem to be directly proportional. c

First of all, sofas and chairs as furniture should not only be comfortable, but also look good, so many times they can't be both, and some comfort has to be sacrificed for the sake of beauty. In addition, the body is not an object with a regular shape, and the height and thinness vary from person to person, so it is difficult to completely tailor the chair and sofa to every detail of the human body.

Because there is no standard for the human body.

Designers just design according to general standards.

What you don't think is suitable, maybe someone else thinks it's very suitable.

You should be talking about ergonomics, not ergonomics, and if it's gym equipment, it's ergonomics that is involved. Most of the furniture such as sofas, coffee tables, desks, leather chairs, dining tables, dining chairs and other furniture that we use most now belong to Western-style furniture, and there are special industry standards and inspection agencies. There are many patents in terms of materials, processing and production equipment, and production processes.

If you can suggest improvements and design home or office furniture that is more comfortable and healthy to use, and all manufacturers don't have similar patents, then you will be a great designer.

Human mechanics is the science of using the principles of mechanics to study the maintenance and control of the balance of the body, and how the body effectively coordinates as the body changes from one posture to another. Based on the knowledge of human physiology, anatomy and theoretical physics, it studies the structure, function and movement laws of human locomotor organs, so as to guide human protection and health care. It has a wide range of applications in sports, dance, handling and weight bearing, medical, aviation and aerospace.

Ergonomics is a technology that was born after the Second World War, including our common styling, but also includes many aspects such as the placement of buttons, the design of explanatory text, etc.

In essence, it is to make the use of tools as suitable as possible for the natural form of the human body, so that the people who use the tools do not need any active adaptation physically and mentally when working, so as to minimize the fatigue caused by the use of tools.

The principle of design is beautiful, durable, and in line with people's subjective ideas. Besides, ergonomics is not absolutely correct.

Rocking chairs, car seats, all good. Ordinary chairs and sofas, the production is not complicated, ** not high.

The effect that conforms to ergonomics may not be good-looking, and the overall effect may be weird.

a. Sitting on a sofa is more comfortable than sitting on a wooden stool, and the method of increasing the stress area is used to reduce the pressure; Therefore, a is wrong, but it is in line with the topic;

b. Use the suction cup hook to hang clothes, which is to use the atmospheric pressure to press the coat hook on the wall; Therefore b is correct, but does not conform to the topic;

c. The winding mountain road is equivalent to the inclined plane, and the inclination of the inclined plane is smaller, and the more labor-saving; The repair of the mountain road is to take advantage of the principle that the longer the inclined plane, the more labor-saving; Therefore, c is correct, but does not conform to the topic;

d. Manufacture wings with asymmetrical shapes, so that the air flow velocity above and below the wing is different, the air pressure is different, the flow velocity is large and the pressure is small, so that the aircraft has a lift; That is, the relationship between fluid pressure and flow velocity is used, so d is correct, but it does not conform to the topic

So choose A

According to the pressure formula p=fs, the larger the force area, the smaller the pressure under a certain pressure

With the same pressure, the pressure is reduced

In the same way, the tires of trucks are more and wider than those of ordinary cars, and the pressure is increased under a certain pressure, thereby reducing the pressure

Therefore, fill in separately: contact area; Pressure; Minish; Reduce the pressure

People sit on the sofa and the wooden bench, the pressure on the two is equal to the grinding, equal to the size of the gravity on the person But the sofa is soft, and the contact area between the person sitting on it is larger than the contact area on the wooden bench From the formula p=f s, it can be seen that the pressure generated by the person on the sofa is small Therefore, the force generated by the sofa on the person per unit area is also small Therefore, the person is more comfortable sitting on the sofa than sitting on the wooden bench

a. The elastic force of the spring and the gravity of the human body are the balance force, but it does not affect the comfort of the human body

b. The elastic force of the spring and the pressure of the human body on the sofa are not a force object, not a balance force, which does not conform to the topic

c. The pressure of the human body on the sofa is equal to the gravity of the human body, which has nothing to do with the elasticity of the spring

d. People sit on the sofa, people are affected by gravity and support, these two forces are balanced forces, equal in size, gravity does not change, support does not change, people receive support force is actually the pressure of the sofa on people, the pressure is certain, the force area sitting on the sofa is large, the pressure of people is small, and people feel comfortable in line with the topic

Therefore, choose D

Answer: Answer: Because sitting on the sofa, the spine sofa is deformed, which increases the force area of the human body Under the condition of constant pressure, increasing the force front car area of the human body can reduce the pressure on the human body, so it feels more comfortable

So the answer is: area; Pressure; Pressure

The pressure of the person on the seat is equal to the gravity of the seat, so the pressure is the same, and the area surrounded by the body of the sofa is large, and the pressure is small;

Therefore, options a, b, and d are incorrect, and option c is correct

Therefore, C