How to calculate the force per unit area

1.

1. Gravity g = mg

(vertically downward, g = 9.8m/s2 ≈ 10m / S2, the action point is at the center of gravity, applicable to the earth surface)

2. Hooke's law f = KX

{along the recovery deformation direction, K: stiffness coefficient (n / M), X: deformation variable (m)}

3. Sliding friction force F = μ FN

{opposite to the relative motion direction of the object, μ： Friction coefficient, FN: positive pressure (n)}

{rrrrrrr}

extended data:

different classification of force

1. According to the nature of force, it can be divided into gravity, universal gravitation, elastic force, friction force, molecular force, electromagnetic force, nuclear force, etc Note that gravity is not equal to gravity under all conditions Gravity does not point to the center of the earth under all conditions. Gravity is a component of the earth's gravitational force on an object, and the other component is a centripetal force. Only on the equator does gravity point to the center of the earth.)

According to the effect of force, it can be divided into tension, tension, pressure, supporting force, power, resistance, centripetal force, restoring force, etc

According to the research object, it can be divided into external force and internal force

According to the action mode of force, it can be divided into non-contact force (such as gravitation, electromagnetic force, etc.) and contact force (such as elastic force, friction force, etc.)

There are four basic interactions (forces): gravitational interaction, electromagnetic interaction, strong interaction and weak interaction

nature of force:

materiality: force is the effect of an object (matter, mass) on an object (matter, mass). When an object is subjected to a force, another object must exert this effect on it. Force cannot exist independently without an object

interactivity (interaction): the interaction between any two objects is always mutual, and the object exerting the force must also be the object under the force. As long as one body exerts a force on another, the stressed body in turn will surely add a force to the exerted body Generating conditions: the force is equal in size (the resultant force is zero, in a state of non directional static motion) or not equal, in the opposite direction, acting on two different objects, and acting on the same straight line. It can be summarized as: foreign body, equivalent, reverse, collinear. A pair of interaction forces must proce and disappear at the same time.)

Vectoriality: force is a vector, which has both magnitude and direction

simultaneity: the force proced and disappeared at the same time

independence: the effect of one force does not affect the effect of another

includes three elements: the size, direction and action point of the force. The accurate expression of the three elements of force by a directed line segment is called the diagram of force. The size is represented by the length of a scaled line segment, the direction is represented by an arrow, the point of action is represented by an arrow or the tail of an arrow, and the straight line along which the direction of a force follows is called the line of action of a force. The diagram of the force is used for the calculation of the force. When the judgment power is large, we must pay attention to the scale of the line segment, because even if one line segment is longer than another line segment, but the scale of the long line segment is also longer, the force represented by the short line segment is not necessarily smaller than that represented by the long line segment

2. N depends, M = PV

3.

S (stress area) = f (pressure) / P (pressure)

the ratio of the pressure on an object to the area under force is called pressure. Pressure is used to compare the effect of pressure. The greater the pressure is, the more obvious the effect of pressure is. The calculation formula of pressure is: P = f / s

There are two ways to increase the pressure: to increase the pressure when the stress area is constant or to decrease the stress area when the pressure is constant

The methods to rece the pressure are as follows: to rece the pressure under the condition that the stress area remains unchanged or to increase the stress area under the condition that the pressure remains unchanged

extended data:

1. When the stress area is fixed, the pressure increases with the increase of pressure At this time, the pressure is proportional to the pressure)

2. If the same pressure acts on the surface of the support, if the stress area is different, the pressure proced is also different. When the stress area is small, the pressure is large; When the stress 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, which has nothing to do with the support surface area and the size of the force area

4. The unit of pressure and pressure is different. The unit of pressure is Newton, which is the same as the unit of general force. The unit of pressure is a compound unit, which is composed of the unit of force and the unit of area

4. Pressure divided by the area under force equals pressure
the unit of pressure is Newton
the unit of area is square centimeter
the unit of pressure is Pascal

5. It doesn't seem to be a mathematical problem. I'm in the wrong place. Passing by, it seems to be a problem of mechanics of materials

6. Starting point (Tianjin Dagang Oilfield No.3 hospital)

1, walk 350 meters to the first middle station of the oilfield

2 take bus no.688 and NO.160;, After 43 stops, get off at Dagu South Road station&# 160;

3 walk 430 meters to Tucheng station

4 take the subway line 1 & # 160;, After 7 stops, get off at Erwei Road station C mouth out) & 160

5 walk 630 meters to Tianjin Central obstetrics and gynecology hospital station

end point (Tianjin Central obstetrics and Gynecology Hospital)

7.

M is defined as million in the electronics instry 220.7m means 220.7 million, or 220.7 million

The pronunciation of

million is English; mɪ ljə n] [beauty] 712; mɪ ljə n] They can be used as nouns and adjectives, and can be translated into millions, millions, etc. The plural number is miles

extended data :

1. U.S. dollar is another name for U.S. dollar, which is the legal national currency of the United States

2. The origin of US dollar:

the Enlightenment of Bretton Woods system came at the end of the Second World War. In July 1944, more than 300 representatives from 44 countries held the "UN International Monetary and financial conference" in Bretton Woods, New Hampshire, USA

The final resolution of the United Nations Monetary and financial agreement and the two appendices of the agreement of the International Monetary Fund and the agreement of the international bank for reconstruction and development, collectively known as the Bretton Woods Agreement, were adopted to establish the Bretton Woods system with the US dollar as the center

8. The handling charge of commodity futures is generally less than 10 / 10000
it's usually less than 10 / 10000. See futures company to collect standard concretely, general each futures company standard is different
four domestic futures exchanges have announced to rece the service charge standard of all futures trading varieties, with the proportion of fee rection ranging from 12.5% to 50%. The service charge level of futures exchanges has decreased by about 30% as a whole, and the adjusted service charge standard will be implemented from June 1< The detailed adjustment methods of the four domestic futures exchanges are as follows: cicfe reces the handling charge of stock index futures to 0.35% of the transaction amount
the previous period exchange
1. The handling charge standard of copper futures is reced from 0.10% of the transaction amount to 0.10% of the transaction amount
2 The transaction fee standard of lead and wire futures contract is reced from 1 / 10000 of the transaction amount to 0.5 / 10000 of the transaction amount
3. The transaction fee standard of rebar futures contract is reced from 0.6% of the transaction amount to 0.5% of the transaction amount
4. The transaction fee standard of rubber futures contract is reced from 0.5% of the transaction amount (contracts before ru1208) and 0.1% of the transaction amount (contracts after ru1208) to 0.5% of the transaction amount respectively< 5. The transaction fee standard of fuel oil futures contract is reced from 0.05% of the transaction amount to 0.35% of the transaction amount
6. The transaction fee standard of gold futures contract is adjusted from 30 yuan / hand to 20 yuan / hand
seven, zinc and aluminum futures contract transaction fee standards were adjusted from 8 yuan / hand and 5 yuan / hand to 4 yuan / hand respectively
Tai Shang Suo: the standard transaction fee of soybean No.1, soybean No.2 and soybean meal is 2 yuan / hand. Corn contract transaction fee standard is 1.5 yuan / hand
the standard transaction fee for soybean oil, palm oil, polyethylene and PVC contracts is 3.5 yuan / hand< The transaction fee of coke contract is 0.8% of the contract amount, and the transaction fee of the same contract is 0.4% of the contract amount on the same day after opening
2. The transaction fee of white sugar and purified terephthalic acid futures contract was adjusted from 4 yuan / hand to 3.2 yuan / hand< Thirdly, the transaction fee of cotton futures contract is adjusted from 6 yuan / hand to 4.8 yuan / hand< 4. The transaction fee of wheat and methanol futures contract is adjusted from 10 yuan / hand to 8 yuan / hand.

9. We can help you rece the transaction rate to 0.28% of 10000
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10. The Maltese pound is the pound and the suffix m is the Maltese pound