How to calculate the balance of several forces

1. Easy to use methods are: force vector diagram method, draw the triangle of force, and use geometric relationship to solve. In addition, the orthogonal decomposition method, which is definitely taught by the teacher of the building owner, decomposes the force along two vertical directions, but for different problems, the decomposition may be different. For example, an object on an inclined plane is best decomposed along the direction of the inclined plane and the vertical inclined plane

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2. Polygon rule of balance force: three forces can form a closed triangle of force after proper translation
therefore, if a closed triangle can be formed after proper translation, it is the equilibrium force; On the contrary, it is not a balance force.

3. 1. Two forces act on the same object. 2. Each pair of forces or resultant forces are on the same straight line, opposite in direction and equal in size. (i.e. the resultant force is zero) 3. The object is in a state of static or uniform linear motion! Balance force is also divided into multi force balance and two force balance, two force balance

4. Balance force: if two forces are equal in magnitude, opposite in direction and on the same straight line, then the two forces are called a pair of balance forces

for example, when a person stands still on the ground, the gravity and the supporting force of the ground are a pair of balance forces; And the pressure that people give to the ground and the supporting force that the ground gives to people are forces and reactions
1. Two forces act on the same object. 2. Each pair of forces or resultant forces is on the same straight line, opposite in direction and equal in magnitude. 3. The object is at rest or moving in a straight line at a constant speed.

5. < UL >

balancing force

if several forces act on the same object, if the object is still or becomes in a state of static or uniform linear motion, or the resultant force is zero, then the resultant force of these forces is zero, we say these forces are balanced

< P >

< objects of the same size, Opposite direction

equilibrium state

uniform rotation state

reaction force

has simultaneity, simultaneous generation and change

< / UL >

6. 1. Two forces act on the same object. 2. Each pair of forces or resultant forces is on the same straight line, opposite in direction and equal in magnitude 3. The object is at rest or moving in a straight line at a constant speed* Note: it should be distinguished from the interaction force! Balance force is also divided into multi force balance and two force balance, two force balance

7. As for the force on the lever, what you need to judge is not how many forces are at one end, but whether the forces are clockwise or counterclockwise. That is to say, if the lever is only affected by this force, you can see whether the lever is going to rotate clockwise or counterclockwise. After calculating the torque of all forces on the fulcrum, you can see whether the lever is going to rotate clockwise or counterclockwise, Clockwise torque and counter clockwise torque are listed on the left and right sides of the equation respectively and can be added.

8. Friction and pull are balanced

9. As for the force on the lever, what you need to judge is not how many forces are at one end, but whether the forces are clockwise or counterclockwise. That is to say, if the lever is only affected by this force, you can see whether the lever is going to rotate clockwise or counterclockwise. After calculating the torque of all forces on the fulcrum, you can see whether the lever is going to rotate clockwise or counterclockwise, Clockwise torque and counter clockwise torque are listed on the left and right sides of the equation and can be added