How to calculate facial strength and physical strength

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.)

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

Two workers were selected to be tested every day, and the time of all kinds of work and rest (including work suspension) in the whole working day from the beginning of work to the end of work was recorded according to the format of table A1. Each test object recorded for 3 consecutive days, and the average value of 3 days was taken to calculate the labor time rate. In case of abnormal proction or accident, no formal record shall be made
Table A1 labor time measurement record table action
name start time
(hours, minutes) labor hours consumed
(minutes) main contents (such as object weight, action frequency
rate, walking distance, labor position, etc.) according to the records in table A1, all kinds of labor and rest are classified (similar activities are classified into one category), Then measure the volume of exhaled breath when engaged in all kinds of work and rest, calculate the energy metabolism rate of all kinds of work and rest according to the content and calculation formula in table A2, multiply by the corresponding cumulative time, and finally get the energy consumption value of all kinds of activities and rest in a working day, and divide the total energy consumption value by the total working hours of the working day, The average daily energy metabolism rate (kJ / min · m) was obtained
Table A2 record of energy metabolism rate measurement type of work: Name:
weight: kg 1 gas proction time: Min 2 gas proction (final reading of gas meter minus initial reading of gas meter) l
final reading of gas meter l
initial reading of gas meter l
air temperature ℃ air pressure Pascal 4 standard state dry gas conversion coefficient under standard state
According to the dry gas volume conversion table, 5 conversion standard state expiratory volume: volume of gas proction multiplied by dry gas under standard state
conversion factor l 6 conversion expiratory volume per minute: standard state expiratory volume / time of gas proction l / min 7 conversion body surface area per square meter, expiratory volume per minute; Expiratory volume per minute:
expiratory volume per minute / body surface area rise / min · M 8 calculate energy metabolic rate (kJ / min · m):
logye = 0.0945-1.15984...... (1)
log (13.26-4.1868ye) = 1.1648-0. 0125x...... (2) the calculation formula of labor intensity index is as follows: I = 3T + 7m, where: I - labor intensity index; T -- working time rate = net working time in working day (min) / total working hours in working day (min) (%); M -- energy metabolism rate of 8-hour working day (kJ / min · m); 3 -- calculation coefficient of labor time rate; 7 -- calculation coefficient of energy metabolism rate. Note: the net working time is the total time of a working day excluding rest and work suspension< This standard is proposed by the Ministry of labor and personnel of the people's Republic of China. This standard is drafted by Institute of health, Chinese Academy of Medical Sciences. The main drafters of this standard are Yu Yongzhong and Li Tianlin