How to calculate the vertical friction
Publish: 2021-05-27 23:50:50
1. To solve the problem of friction, you must understand the concept of friction, that is, the conditions under which friction occurs
the so-called friction is the force that hinders the relative motion of an object, and the direction of friction is opposite to the motion direction or relative motion direction of the object
the conditions of friction are: (1) two objects must contact each other 2) There is a squeeze between two objects 3) There is a tendency of motion or relative motion between two objects
1. When an object is stationary on a horizontal plane, if it is not pushed or pulled, it will not be affected by friction. If thrust or pull is received, it belongs to the category of static friction. The size of friction is equal to that of pull or thrust, and has nothing to do with the gravity or pressure of the object. Only the maximum static friction is related to the pressure or gravity on the object
2. If the object is pressed against the wall, the friction force is equal to the gravity of the object
3. As long as the object moves in a straight line at a constant speed on the horizontal plane, the object is subject to the action of balance force in the horizontal direction, that is, the thrust or pull force is equal to the friction force
4. If the object is not pushed by a force of 10N, the object is subjected to static friction, which is equal to the thrust. Just push with 15N force, and the friction force on the object is the maximum static friction force. If the thrust force is increased later, the friction force will not change. Theoretically, the sliding friction of objects is less than the maximum static friction, but it is generally considered that they are equal
5. Pull a 10N object with 15N force to move vertically and uniformly, then the friction force is f = 15-10 = 5N
if you understand my answer above, I think you will have a better understanding of friction force!
the so-called friction is the force that hinders the relative motion of an object, and the direction of friction is opposite to the motion direction or relative motion direction of the object
the conditions of friction are: (1) two objects must contact each other 2) There is a squeeze between two objects 3) There is a tendency of motion or relative motion between two objects
1. When an object is stationary on a horizontal plane, if it is not pushed or pulled, it will not be affected by friction. If thrust or pull is received, it belongs to the category of static friction. The size of friction is equal to that of pull or thrust, and has nothing to do with the gravity or pressure of the object. Only the maximum static friction is related to the pressure or gravity on the object
2. If the object is pressed against the wall, the friction force is equal to the gravity of the object
3. As long as the object moves in a straight line at a constant speed on the horizontal plane, the object is subject to the action of balance force in the horizontal direction, that is, the thrust or pull force is equal to the friction force
4. If the object is not pushed by a force of 10N, the object is subjected to static friction, which is equal to the thrust. Just push with 15N force, and the friction force on the object is the maximum static friction force. If the thrust force is increased later, the friction force will not change. Theoretically, the sliding friction of objects is less than the maximum static friction, but it is generally considered that they are equal
5. Pull a 10N object with 15N force to move vertically and uniformly, then the friction force is f = 15-10 = 5N
if you understand my answer above, I think you will have a better understanding of friction force!
2. A store of express can sell all kinds of procts under a big category
Global Express is Alibaba's online trading platform for the global market, which is known as the international version of "Taobao" by the majority of sellers
just like Taobao, you can edit your baby into online information and publish it overseas through the express platform. Similar to the domestic delivery process, the baby is transported to the buyer through international express delivery. In this way, it is easy to enter into transactions with buyers from more than 220 countries and regions and earn US dollars. However, in order to protect domestic e-commerce and restrict or prohibit cross-border online shopping, Russia and Argentina have implemented corresponding policies.
Global Express is Alibaba's online trading platform for the global market, which is known as the international version of "Taobao" by the majority of sellers
just like Taobao, you can edit your baby into online information and publish it overseas through the express platform. Similar to the domestic delivery process, the baby is transported to the buyer through international express delivery. In this way, it is easy to enter into transactions with buyers from more than 220 countries and regions and earn US dollars. However, in order to protect domestic e-commerce and restrict or prohibit cross-border online shopping, Russia and Argentina have implemented corresponding policies.
3. Hello
if you are buying medicine before digging, then buy a compass. Dig in tianshengyuan
to level 15
use 2-grade compass
level 27 3-grade compass
this super money making
hehe!
if you are buying medicine before digging, then buy a compass. Dig in tianshengyuan
to level 15
use 2-grade compass
level 27 3-grade compass
this super money making
hehe!
4. The reasons for the problem are as follows:
1
2. The TCP / IP settings of the computer setting the router are correct. The router is connected to adslmodem. Because the modem settings conflict with the default settings of the router, it is unable to enter the router settings page
3. The router is used in the existing network, which is 192.168.1.0 network segment, the same as the router's LAN network
4. Proxy server is set in browser
5. The computer setting the router uses multiple network cards, and the TCP / IP setting of the network card is wrong;
1
2. The TCP / IP settings of the computer setting the router are correct. The router is connected to adslmodem. Because the modem settings conflict with the default settings of the router, it is unable to enter the router settings page
3. The router is used in the existing network, which is 192.168.1.0 network segment, the same as the router's LAN network
4. Proxy server is set in browser
5. The computer setting the router uses multiple network cards, and the TCP / IP setting of the network card is wrong;
5. When you appeal, you will see the one with * sign. You must fill in it, otherwise it will be your present effect.
6.
Open QQ security center to confirm
for example, change the password:
-
it prompts to open the mobile version of QQ security center
< / OL >
QQ security center is QQ account protection software launched by Tencent. Let your QQ account, QQ currency and game equipment enjoy bank level security protection, and you can master QQ account information at any time
7. Hello, sorry, step by step high sales policy, city regional agency system, no national uniform retail price. Specifically, please go to the major electrical appliance stores in the local market, such as Gome Suning to learn about the situation.
8. At present, Samsung has not listed the S9 model. It is suggested to verify the model information. Second, the resial value of the mobile phone is affected by many factors, so it needs to be evaluated according to the actual situation. We have no specific quotation and evaluation information in the network
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