Is the effect of pressure pressure?

The effect of pressure is to deform the object. For example, if you press a spring hard, the spring will be shortened; Pinch the plasticine by hand, the plasticine will be deformed, etc.

Pressure: The pressure applied to an object per unit area is called pressure. (Pressure is not the strength of the pressure, but the pressure per unit area).

As for why pressure is used in physics to express the effect of pressure, let's look at the example of if you take a pin and press down on your fingers with the same force at both ends, and you feel a headache at the point. The pressure you use is certain, and the feeling is different means that the effect of the pressure is different, that is, the pressure is different.

Here, the effect of pressure is not only determined by the pressure, nor only by the area under force, but also by the pressure per unit area, i.e., the pressure. The effect of pressure on the tip is obvious, that is, the pressure is strong; The effect of the pressure on the other end of the nail cap is not obvious, that is, the pressure is small.

Pressure is defined as the amount of pressure applied per unit area. The physical meaning (action) is to denote the effect of the action of pressure. The effect of pressure is that it can change the shape of the object, manifesting itself as a whole.

The effect of pressure is to change the shape of the object, which is manifested locally. With the same pressure, the smaller the contact area, the greater the pressure. The larger the contact area, the lower the pressure.

I think the effect of pressure is pressure, and if there is pressure, there must be a contact area, and the pressure contact area = pressure.

So I think the effect of pressure is that it inevitably produces pressure.

False, pressure is the force exerted on a unit area.

Wrong. Pressure is the force exerted on a unit area.

p = f / s

The effect of pressure is called pressure – rightly so!

The effect of pressure is related to the size of the pressure and the size of the force area, when the force area is constant, the greater the pressure, the more obvious the effect; When the pressure is constant, the smaller the force area, the more obvious the effect

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 direction 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 vs. gravity

1) Pressure is generated by the deformation of two objects in contact with each other when they are squeezed into 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.

2) The direction of the pressure does not have a fixed direction, but it is always perpendicular to the contact surface of the stressed object. Gravity has a fixed direction (because the contact surface may be horizontal, vertical or oblique) and is always straight down.

3) Pressure can be generated by gravity or it may not be related to gravity. When an object is placed on a horizontal plane and there is no other external force acting on it, the pressure is equal to the magnitude of gravity. When an object is placed on an inclined plane, the pressure is less than the gravitational force.

When an object is pressed against a vertical plane, the pressure is sometimes independent of gravity. When an object is lifted and pressed against the ceiling, gravity weakens the action of pressure.

The effect of pressure refers to the pressure intensity. Pressure is a physical quantity that represents the effect of pressure, and its magnitude is related to the magnitude of pressure and the size of the force area. Definition of pressure:

The pressure exerted on the unit area of an object is called pressure. Formula: p=f represents pressure in pascal; f denotes pressure in Newtons; s indicates the stressed area, and the unit is square meters.

Knowledge points related to pressure and wisdom.

1) When the force area is constant, the pressure increases with the increase of pressure. (The pressure is proportional to the pressure).

2) The same pressure acts on the surface of the support, if the force area is different, the pressure generated is also different. The stress area is small, and the pressure is strong; When the force area is large, the pressure is small.

3) Pressure and pressure are two completely different concepts: pressure is the force on the support surface and perpendicular to the support surface, and has nothing to do with the area of the support surface and the size of the force area. Pressure is the pressure per unit area of an object, which is related to the area of force and the amount of pressure.

1. Stress gives you the strength to deal with challenges.

2. Pressure makes people more positive, improves work efficiency and work ability.

3. Stress helps you learn and grow.

4. Stress makes people sober.

Stress makes life more interesting, because we see it as a survival tool, and sometimes we consciously put ourselves in a stressful environment just to enjoy life and make life more fun. Challenges such as inviting someone on a date for the first time, facing and overcoming known fears, meeting people you've never met before, learning something new, etc. When we mention stressors, we don't usually think of these right away.

This may be because of the positive results that can be achieved in the above-mentioned stress, but it is also a type of stress that helps us achieve a sense of contentment, health and happiness.

6. Pressure makes people more sensitive. Stepble, a scientist at New Mexico State University in the United States, said: "Short-term stress provides people with the physical strength and energy they need to deal with an emergency.

1. The ratio of the pressure to the area of the force is called pressure, and the pressure is used to compare the effect of pressure, the greater the pressure, the more obvious the effect of pressure. Pressure is the force of all vertical action on the bearing surface, and pressure is the pressure per unit area; The magnitude of pressure is not related to the force area, while the magnitude of pressure is related to the force area. It is not pressure but pressure that measures the effect of pressure; The unit of pressure is Newton and the unit of pressure is Pascal. So you can't make the mistake of thinking that pressure is pressure.

2. When the stress area is constant, the pressure increases with the increase of pressure. (The pressure is proportional to the pressure).If the same pressure acts on the surface of the support, if the force area is different, the pressure generated is also different. The stress area is small, and the pressure is strong; When the force area is large, the pressure is small.

Pressure and pressure are two completely different concepts: pressure is the force on the support surface and perpendicular to the support surface, and has nothing to do with the area of the support surface and the size of the force area; Pressure is the pressure per unit area of an object, which is related to the area of force and the amount of pressure. There is a difference between the units of pressure and pressure. The unit of pressure is the newton, which is the same as the unit of force in general.

The unit of pressure is a composite unit, which consists of the unit of force and the unit of area.

3. There is a certain limit to the pressure that any object can withstand, and beyond this limit, the object will be damaged. When an object is deformed due to external or internal causes, the two sides of either section of the object act on each other, and this force on the unit section is called pressure.

Generally speaking, for solids, compression (or tension) deformation and shear deformation will occur under the action of external forces. Therefore, to describe exactly these deformations of a solid, we must know the effect of the three components of the force acting on its three mutually perpendicular faces. Thus, corresponding to each component of the forces fx, fy, fz, acting on the three mutually perpendicular surfaces of ax, ay, and az, the stress f a has nine different components, so strictly speaking the stress is a tensor.

Since the fluid cannot produce shear, there is no shear stress. Therefore, for a fluid at rest, no matter how the force acts, there is only a force perpendicular to the contact surface; And because of the isotropic nature of fluids, the forces acting on the unit area are the same at the same point, regardless of how these surfaces are oriented. Since f a is fixed in all directions at each point of the ideal fluid, the directionality of the stress f a does not exist, and this stress is sometimes called pressure, which is called pressure in secondary school physics.

Pressure is a scalar quantity. The application of this definition of pressure (pressure) is generally always limited to questions about fluids.

Pressure is the force acting perpendicular to an object;

Pressure is the pressure applied per unit area.

The effect of pressure is mainly manifested in two aspects, one is that when the force area is constant, the greater the pressure, the more obvious the effect of pressure. Second, when the pressure is constant, the force area is smaller. The more pronounced the effect of 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.

Stress-related concepts.

1. Atmospheric pressure: The pressure generated by gravity in the air column on the earth's surface. It is related to the altitude, latitude and meteorological conditions of the location.

2. Differential pressure (differential pressure): the relative difference between two pressures.

3. Absolute pressure: all the pressure in the space where the medium (liquid, gas or vapor) is located. Absolute pressure is the pressure relative to zero pressure.

4. Gauge pressure (relative pressure): If the difference between absolute pressure and atmospheric pressure is a positive value, then this positive value is gauge pressure, that is, gauge pressure = absolute pressure - atmospheric pressure "0".

5. Negative pressure (vacuum gauge pressure): Corresponding to the "gauge pressure", if the difference between absolute pressure and atmospheric pressure is a negative value, then this negative value is negative pressure, that is, negative pressure = absolute pressure - atmospheric pressure < 0.

6. Static pressure: generally understood as "the pressure that does not change with time, or the pressure that changes slowly with time, that is, the gauge pressure value measured in the fluid without being affected by the flow rate".

7. Dynamic pressure: Corresponding to the "static pressure", the pressure that changes rapidly with time, that is, the dynamic pressure refers to the kinetic energy of the fluid per unit volume. Usually calculated with 1 2 2. where — fluid density, v — fluid velocity.

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 s, the unit of pressure is pascal (abbreviated pascal), and the symbol is pa.

The methods of increasing the pressure are: increasing the pressure under the condition that the force area remains the same or decreasing the force area when the pressure is not the same. Fang Chang's judgment method for reducing pressure is:

Decrease the pressure under the condition that the force area remains the same, or increase the load area under the condition that the pressure is constant.

The liquid has pressure on both the side walls and the bottom of the container, and the pressure increases with the depth of the liquid.

The characteristics of the internal pressure of the liquid are: the liquid has pressure from the inside in all directions; The pressure increases with depth; At the same depth, the pressure of the liquid is equal in all directions; Liquid pressure is also related to the density of the liquid, and the denser the liquid, the greater the pressure. The amount of pressure inside the liquid can be measured with a piezometer.