When the pressure is constant, the larger the force area, the smaller the pressure, what are the app

Example 1: If you are carrying school supplies of the same quality to school, choose a school bag with a thinner back width and less pressure on your shoulders.

Example 2: For the same person, sitting on the sofa is more comfortable than sitting on the hard bench, and the contact area between the person and the sofa is larger than that between the person and the hard bench, and the person sitting on the sofa is less pressed.

Let's talk about velocity first, velocity is a physical quantity that indicates how fast or slow an object moves, and the faster the motion, the greater the speed. Speed is related to distance and time, when comparing speed, it is either the same time ratio distance, that is, it is defined as the distance passed per unit time, the larger the distance, the greater the speed, and the definition can be expressed as v=s t; Either the same distance is more than time, that is, it is defined as the time to pass per unit of distance, the larger the time, the smaller the speed, and the definition should be expressed as 1 v=s t, which is inconvenient. Similarly, because pressure is a physical quantity that indicates the effect of pressure, the more obvious the effect of pressure, i.e., the greater the pressure.

When defining the pressure, take the pressure per unit area and define it as p=f s. In the physical definition, the denominator is inversely proportional to the numerator of the equation that is proportional to the physical quantity being studied.

Hit a new nail with a hammer, place the nail on a thin iron plate, and look at the pits of the iron plate after striking. After grinding off the head of the nail, the nail placed on the thin iron plate is also struck. Make a comparison.

In the case of a certain force area, the greater the pressure grip, the more obvious the pressure effect.

Pressure refers to the magnitude of the force per unit area, the unit is Pascal (Pa), which can be expressed by the formula pressure = p a, where p is the magnitude of the force and a is the area of the force.

When the same force is applied to a force area of different sizes, different pressure effects are produced. If the force area is small, the pressure per unit area will increase, resulting in greater deformation or damage. Conversely, when the force area is large, the pressure per unit area decreases and the effect on the object decreases.

For example, when a person gently presses the palm of the hand on a pencil, the palm of the hand does not have much effect on the pencil due to the large area of the palm and the pressure on the unit area is small; But when the person points his finger on a small point of the pencil, the area of the finger becomes smaller, and the pressure on the unit area increases, making it easy to pinch the pencil.

To sum up, when the force area is constant, the greater the pressure, the more obvious the effect on the object.

Here's how to reduce or increase the pressure:

Reduce pressure: 1. Increase the stress area: if the force area is small, the pressure per unit area will be relatively large, and the pressure can be reduced by increasing the force area.

2. Increase support: adding a gasket under the object, calculating the rubber pad, etc., can increase the support area, thereby reducing the pressure per unit area.

3. Strengthen the material structure: adding a support structure or adding a reinforcing material inside the object can improve its own compressive performance, thereby reducing deformation or damage.

Increase pressure: 1. Reduce the force area: If you need to increase the pressure, you can achieve it by reducing the force area, such as flattening the iron plate, etc.

2. Increase the support range away from the force: add the support at the place far away from the force of the object, so as to enhance its structural stability and reduce deformation and material damage.

3. Use reinforcing materials: If you need to increase the pressure, you can choose to use reinforcing materials for reinforcement, such as using reinforced concrete. This increases the pressure resistance of the object, allowing it to withstand greater forces.

Methods of reducing or increasing the pressure vary from case to case and need to be selected and practiced specifically based on the problem and requirements.

When the force area is constant, the greater the pressure, the more obvious the effect of pressureThe conclusion is correct.

The definition of pressure is the pressure exerted on a unit area of an object. The greater the pressure, the more significant the effect. There are two ways to increase the pressure, one is to increase the pressure when the unit area is constant; The second is to reduce the contact area when the pressure is constant.

Idea Analysis: The definition of pressure is the pressure exerted on a unit area of an object. The greater the pressure, the more significant the effect.

Schematic diagram of the experiment.

Pressure refers to the pressure exerted on a unit area of an object, and the symbol is p (pressure). Pressure is used to indicate the effect of pressure, and the greater the pressure, the more obvious the effect of pressure. The formula for calculating pressure is:

p=f divided by s, the single pin of the pressure is pascal (abbreviated as pa), and the symbol is pa.

The methods of increasing the pressure are: increasing the pressure while the force area is the same or decreasing the force area when the pressure is not the same. The methods of reducing the pressure are: reducing the pressure under the condition that the area of the force before the force is unchanged or increasing the force area under the condition that the pressure is constant.

Schematic diagram of the experiment.

Methods of decreasing or increasing pressure

The method of reducing the pressure: when the pressure f is constant, increase the force area S; When the force area s is constant, the pressure f is reduced; At the same time, the pressure f is reduced and the force area s is increased.

The method of increasing the pressure: when the pressure f is constant, reduce the force area S; When the stress area s is constant, the pressure f is increased; At the same time, the pressure f is increased and the force area s is reduced.

When the pressure is constant, the larger the force area, the smaller the pressure, and the smaller the effect of pressure; When the force area is constant, the greater the pressure, the greater the pressure, and the greater the effect of the pressure.

In physics, pressure refers to the force that occurs on the contact surface of two objects, or the perpendicular force of a gas on the surface of a solid and a liquid, or the perpendicular force of a liquid on a solid surface. (The force that acts perpendicular to the surface of an object due to the mutual compression of objects is called pressure.) For example, the force of a football on the ground, the force of an object on an inclined plane, the force of a hand on a wall, etc.

The direction of the pressure is perpendicular to the contact surface and directed towards the pressed object (note that "vertical" has different meanings than "vertical"), and is generated when the objects are in contact with each other and are squeezed against each other. The pressure on a solid surface is usually the result of elastic deformation and is generally a contact force.

The pressure on the surface of liquids and gases is often the result of gravity and molecular motion. The square bond of action of the pressure is usually perpendicular to the contact surface of the object. If the direction of action of the pressure is not perpendicular to the contact surface, it is usually due to a combination of pressure and friction.

Pressure is generated by the deformation of two objects in contact with each other, and according to the nature of the force, the pressure belongs to elastic force; Gravity is due to the attraction of an object near the ground by the earth and belongs to gravity.

Misunderstood

1. Pressure is a kind of elastic force associated with the deformation of the object.

2. Pressure occurs between two objects that are in contact with each other and squeezed. Pressure is a contact force, and it is impossible to generate pressure between any two objects that are separated from each other, and there is no pressure between objects that are in contact with each other without squeezing action.

3. The direction of pressure is always perpendicular to the contact surface of the object and points to the pressed object.

4. Gravity can cause pressure on an object, but pressure is not gravity, and pressure is sometimes irrelevant to gravity.

When the force area is constant, the greater the pressure, the more obvious the effect of action When the pressure is constant, the smaller the force area, the more obvious the effect In physics, pressure is used to express the effect of pressure, and its definition is: the pressure on the unit area of an object is called pressure

So the answer is: obvious; The smaller; Pressure.

Change the pressure force small method:

Reducing the pressure or increasing the force area can reduce the pressure;

Increasing the pressure or decreasing the force area can increase the pressure.

Application: Pressure reduction: school bag straps, skis, sleepers

Increase pressure: skates, kitchen knives, nails (the tip of the nail increases the pressure, the nail cap decreases the pressure).

f=p*s

f: The force received.

P: Pressure. s: stressed area.

Imagine walking on the snow and getting stuck on your tiptoes or putting on snowshoes.

1) When studying the relationship between the effect of pressure and the size of the force area, keep the pressure unchanged, change the size of the force area, and observe the relationship between the depth of the depression of the foam and the size of the force area

2) Comparing the two experiments of A and B, the pressure of B is large, the depression degree of the foam is large, and the effect of pressure is obvious, indicating that when the force area is constant, the greater the pressure, the more obvious the effect of pressure

So the answer is: (1) B and C;

2) When the force area is constant, the greater the pressure, the more obvious the effect of pressure is poor

Pressure is directly proportional to pressure"."The pressure is directly proportional to the pressure"All correct.

Upstairs said that "the reason is that the causal relationship is not understood" is incorrect, and there is no causal relationship between pressure and pressure.

For example, 1) the car is parked on the ground (assuming that the ground is horizontal), the pressure of the car on the ground is the weight of the car, and the pressure on the ground is the weight of the car divided by the ground contact area of the tire, then it is the pressure that produces the pressure.

2) When the pressure cooker is heated, the pressure in the pressure cooker is generated, and the pressure is multiplied by the product of the area of the pressure cooker cover, which is the pressure of the air in the pressure cooker on the pressure cooker cover, then the pressure produces pressure.

This statement is true, but it is not true to say that "pressure is directly proportional to pressure".

The reason is that the causal relationship is not figured out, and the pressure changes with the change in pressure, not the other way around.

The pressure is related to the pressure and the area of force, the greater the pressure, the smaller the area of force, the greater the pressure. [That is: when the force area is constant, the pressure is proportional to the pressure When the pressure is constant, the pressure is inversely proportional to the force area