Acceleration calculation force

2. Gravitation is about equal to gravity, so GMM / R ^ 2 = mg, so
G = GM / R ^ 2

3. Set the inclination angle as α
normal pressure of object to inclined plane = mgcos α
(without drawing, you can also imagine a special position: α= 0, positive pressure = mg, α= 90º Positive pressure = 0, so it's cos α， And sliding force = mgsin α On the contrary)
sliding friction f = n· μ= mgcos α·μ， The direction of force is opposite to that of motion.

4. This is a problem of impulse. Let the momentum before and after a person touches an object change to M & # 8710; 5. In the process of collision, when the force of the object on the human is n and the collision time is t, there is M & # 8710; V=(N-Mg)t!

this n is equal to the human pressure on the object in the collision process. Because t is very small, this n is generally very large, far greater than gravity. The problem can be simplified as:
M & # 8710; V / T = n, this # 8710; V / T is the average acceleration of people in the collision process

I don't know if I'm wrong!

5. G is the sign of the acceleration of gravity, which is specified

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7.

1. Displacement formula of uniform acceleration linear motion:

8. Generally speaking, it's human, but it's not human that works, it's machine

9.

g=g0(1-0.00265cos&)/ 1 + (2H / R)

G = (GM) / R ^ 2 - (MV ^ 2) / R is the radius of the earth

the centripetal force is too small to be ignored, so it is abbreviated as g = (GM) / R ^ 2

if it is pushed by the universal gravitation, it is g = (GM) / R ^ 2

if it is pushed by the terminal velocity of landing, it is g = V terminal ^ 2 / 2H

< P > take the earth as a rotating ellipsoid, and the formula is:

G = 9.7803 (1 + 0.005324sin & # 178; ψ- 0.000005sin² two ψ) m/s²

Where ψ Is the geographic latitude of the object. For example, at the equator = 0, g = 9.78m/s and # 178;, At both poles = 90 °， g=9.83m/s²

extended data:

the acceleration of gravity is a vector, the direction is always vertical and downward, and the size can be calculated by experimental method. Experiments show that the magnitude of the acceleration of gravity varies slightly with its location on the earth

For example, g = 9.780 M / S2 at the equator, 9.832 M / S2 at the north pole and 45 m / S2 at the north latitude ° In Beijing, g = 9.801 M / S2, etc. Generally, G is taken as 9.80 M / S2 when it is not specified. In rough calculation or explanation, G can be taken as 10m / S2

10. "Are you in a good mood?"“ Are you feeling well today? "“ Do you have a clear idea of what to do? " In the early morning of April 21, Tang chunsen, an employee of Jilin Petrochemical Construction and repair company, was seriously giving pre shift safety tips
then he seriously said, "today I am a team safety officer. I hope you will support me in my work."
as a construction and repair company responsible for the maintenance of 78 sets of proction units in Jilin Petrochemical Company, it undertakes more than 15000 maintenance operations every year, and construction safety is the top priority“ The activity of "I am a safety officer for one day" is a characteristic work of the company's safety management in 2009. Every front-line employee is required to work in the position of "team safety officer" for one day in turn. Its purpose is to mobilize all employees to participate in safety management and improve the overall safety quality of employees
at about 8:00 in the morning, Tang chunsen wrote down the work plan of the day in the safety work record book of the team and started the work of "safety officer" for the whole day
after a detailed understanding of the day's construction tasks, he came to an outdoor climbing site“ The weather is abnormal these two days. It's always raining. We all wear a lot of clothes. It's easy to have an accident if we slip a little ring climbing. " He said to the author while observing the operation process
suddenly, Tang chunsen shouts to a worker who is working: "Hey! Xiao Yang, you put up the seat belt. Now the fastening point is lower than the waist level. In addition, the distance between each layer of the scaffold should not be greater than 80 cm. "
the author is very surprised that an ordinary operator can say such professional safety terms. But Tang chunsen said with a smile: "these safety knowledge are very common. We often learn safety activities, and everyone can master them. I just reminded him
then, Tang chunsen came to a pipeline welding site and saw workers placing construction machines and tools. An operator jokingly said: "Tang safety, see if we are qualified on site?"
after seeing the scene, Tang chunsen said: "keep the oxygen bottle further away. When you work, the welding belt and oxygen Belt should be separated, and the welding machine can be started later."
Su Zhenlong, the construction dispatcher at the site, said with a smile: "there is not much to say, every sentence is on the point. In recent years, in strict safety management, employees have not only improved their safety skills and safety knowledge, but also their sense of safety responsibility has been continuously improved, and the phenomenon of "three violations" in construction has been significantly reced. "
before the end of the interview, Tang chunsen said: "after working as a safety officer for half a day, I really felt different. I always thought that safety management was the work of full-time safety officers, and our construction personnel would finish the execution. But after half a day, I really realized the real meaning of the sentence" safety managers participate. "
following Tang chunsen for a walk, the author found that every operator can seriously implement the tips and corrections of the "safety officer" on ty. The same purpose, from blindly instilling to personal experience, has changed the form, but the effect is different. Safety management needs such transposition, which is easy to accept. This is the purpose of "I am a safety officer for one day".