How to calculate air friction

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2. Dear landlord:
when calculating the size of friction, we should first judge whether the friction is sliding friction or static friction. And then it is solved by the corresponding method
the calculation formula of sliding friction is f
= μ N
, where μ Dynamic friction coefficient, also called sliding friction coefficient, is only related to material and roughness of contact surface, but has nothing to do with contact area; N is the positive pressure
sliding friction: the force that occurs between two objects that contact each other and slide relatively, and prevents them from sliding relatively
the direction of friction is opposite to the direction of relative motion or the trend of relative motion. Instead of moving in the opposite direction of the object. Friction can be used as power or resistance
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3. To Shenzhen Nanshan bus station overpass passenger station transfer Coach: Shenzhen Nanshan bus station overpass passenger station Guangzhou Conghua bus station

4. Air resistance. The air resistance is directly proportional to the speed of the object movement, that is, f = KVK is the coefficient of air friction, which is related to the air density. It can be considered as a constant where we can find something missing

5.

From Guangzhou Conghua bus station to Shajing passenger station, three schemes are recommended, which are as follows:

Guangzhou South Railway Station → Guangming City railway station, about 91 yuan, about 3 hours and 22 minutes, Go to exit h of Guangzhou metro station, transfer to Metro Line 2 (take station 15) and get off at exit b of Guangzhou South Metro station. Go to Guangzhou south railway station, transfer to high speed railway and get off at Guangming City railway station, Go to Guangming city station (bus stop), transfer to m356 (original 788) (take 30 stops) and get off at Shenzhen Shajing passenger station master station

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Guangzhou Guangyuan passenger station → Shenzhen Shajing central passenger station (107 National Road), about 53 yuan, about 2 hours and 43 minutes

2 From the slow line of Guangzhou Line 8 (less frequency), get off at the terminal of Guangyuan passenger station (station), go ahead to Guangyuan passenger station in Guangzhou, and then take a coach to Shajing central passenger station in Shenzhen (National Highway 107). Take about 30 meters to Shenzhen Shajing bus station (National Highway 107) about 55 yuan, about 2 hours and 42 minutes. Take Guangzhou Conghua bus station and transfer from line 6 to Dongpu bus station Get off at Shenzhen Shajing central passenger station (National Highway 107). Walk about 30 meters to Shenzhen Shajing passenger terminal

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6. If there is no through train, take a long-distance bus from Shajing central passenger station to the provincial bus passenger station, get off and walk to Guangzhou metro station, then transfer to Metro Line 5 (take 5 stops) and get off at Jiaokou metro station.

7. There are two bus stations in Shenzhen, there are buses to Conghua bus station,
1
2. Long distance bus ride at Shenzhen Nanshan bus station overpass passenger station: Shenzhen Nanshan bus station overpass passenger station Guangzhou Conghua bus station

8. General topics will be ignored, hard requirements, then use the conservation of energy

9. Air resistance coefficient, also known as drag coefficient. In the case of a certain front area and vehicle speed, the air resistance is directly proportional to the drag coefficient. In other words, the greater the air resistance coefficient, the greater the air resistance. The air resistance coefficient mainly depends on the shape of the body. The smaller the air resistance coefficient is, the better the design of car body is. It is of great practical significance to rece the air drag coefficient for recing the fuel consumption of vehicles.

10. Between "North Station of University Town
and South Station of university town"
is the center lake
next to the south of
Central Lake is
Guangdong Provincial Hospital of traditional Chinese medicine
university town hospital<

the following is the location map of
subway station, Central Lake and University City hospital
note:
the "North Station of university town" above the picture is an enlarged picture
whether you go to the
central lake or to the
University City Hospital, you are at the
North subway station of University City
entrance C
exit.