How to calculate the force

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. The computing power of CPU is related to the number of CPU cores, the frequency of core and the ability of single clock cycle of core
the ability of double precision floating-point computing is commonly used to measure the scientific computing ability of CPU, that is, the ability to process 64 bit floating-point data

the processor supporting avx2 can perform 16 floating-point operations in one core and one clock cycle, Also known as 16flops
CPU power = number of cores x frequency of cores x 16flops
processors supporting avx512 can perform 32 floating-point operations in one core and one clock cycle, also known as 32flops
CPU power = number of cores x frequency of cores x 32flops

3. According to the official website of coin'an mining pool, BTC's calculation power has reached 1.75e, 36053 effective miners, ranking 11th at present, OK's calculation power is 6.89e, and Huo's calculation power is 4.75e. At present, there is still a big gap in the coin'an mining pool. However, as a bystander, you should have a unique vision. Looking at the ups and downs of the previous coin circle, the development and launch of various new technologies, although coin an is late, it can always make the latecomer rank first. It probably doesn't take long for this ranking to change.

4. 1、 Lever
(1) basic concept of lever
a hard rod that can rotate around a fixed point under the action of force is called lever
there are five terms of lever: ① fulcrum: the point around which the lever rotates (o); ② Power: the force that makes the lever rotate (F1); ③ Resistance: the force that prevents the rotation of the lever (F2); ④ Power arm: distance from fulcrum to action line of power (L1); ⑤ Resistance arm: distance from fulcrum to resistance action line (L2)< (2) the condition of leverage balance × Power arm = resistance × The resistance arm, the equilibrium condition, is the lever principle discovered by Archimedes< (3) three levers:
1. Labor saving lever: L1 & gt; L2, F1 & lt; F2 The feature is labor saving, but it costs a lot of distance (e.g. iron scissors, guillotine, driver)
② lever: L1 & lt; L2, F1 & gt; F2 The characteristic is laborious, but saves the distance (e.g. fishing rod, barber scissors, etc.)
③ equal arm lever: L1 = L2, F1 = F2 when balancing. It is characterized by no effort and no effort Such as: balance)
2. Buoyancy
(1) buoyancy
the upward force of liquid or gas on an object immersed in liquid or gas is called buoyancy. The cause of buoyancy is: the object immersed in liquid (or gas) is subject to the upward and downward pressure difference of liquid (or gas). Buoyancy is applied to liquid (or gas), buoyancy belongs to elastic force
(2) Archimedes principle
an object immersed in liquid is subject to upward buoyancy, which is equal to the gravity of the liquid it displaces. Expression: F = g row= ρ Liquid V discharges g (Archimedes principle also applies to gas)
it can be concluded that the density of the liquid and the volume of the liquid displaced by the object are two factors that affect the buoyancy< (3) the calculation method of buoyancy
① Archimedes principle: F floating = g row= ρ Liquid V row g (also suitable for gas)
② two force balance: F floating = g object (suitable for floating and suspension)
③ multi force balance: F floating = G-F (this is the case of measuring buoyancy with a spring dynamometer)
④ pressure difference method: F floating = f up-f down (not commonly used)
(4) measurement of buoyancy
① common method: measure the gravity g of an object with a spring dynamometer, When an object is immersed in the liquid and the indication F of the spring dynamometer is read out, the buoyancy of the object immersed in the liquid is: F floating = G-F< (2) measuring v-row (measuring cylinder) method: measure v-row and use f = g-row= ρ The buoyancy of liquid V row G is calculated
(5) the buoyancy and sinking conditions of objects are determined by the relationship between gravity and buoyancy. ① When gravity is greater than buoyancy, the object sinks; ② When gravity equals buoyancy, the object floats; ③ When gravity is less than buoyancy, the object floats< (6) utilization of buoyancy
1. Ship: hollow method is used to increase the available buoyancy, so that the ship can float on the water. The size of a ship is expressed in terms of its displacement - the mass of boiled water discharged when it is fully loaded
② submarine: submarine floats and sinks by changing its own gravity
③ balloons and airships: both use the buoyancy of the air to work. Balloon and airship lift, mainly by changing the volume of the airbag to change their own buoyancy to achieve.

5.

When calculating the force, it has nothing to do with whether the lever is bent or not

because the arm of force is the distance from the fulcrum to the action line of the force, which has nothing to do with the shape of the lever. Finding out the arm of force can be calculated according to the lever balance condition. As shown in the figure below, the arm of force is the length of the dotted line, which has nothing to do with the shape of the rod

6. Newton's second law of motion: force = mass × Acceleration, force must know mass and acceleration

7. I think if we only know volume and velocity, we can't find the force. i 'm sorry!

8. P = f / s
F = ps
when the object is flat on the table, the pressure is equal to gravity
F = g
liquid pressure formula
P = liquid density * g * H (depth)

9. The power on the equipment and the power on the panel is 1:1
the power and the street standing attack depend on the class, and there are weapons proficient and so on
about 1 point more power in the physics class is equal to the surface value, which is about 0.004 * your basic attack
the improvement of the material attack depends on your panel, which is unknown
now there are still people calculating the damage, which is meaningless
please ask me if you don't understand