What is balance force

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2. To be exact, in mechanics, the equilibrium force must be applied to the same rigid body, otherwise from the microscopic point of view, the two forces still act on different molecules. In fact, even if we let the force act on a typical rigid body, in reality, the interaction between molecules (mainly electromagnetic force) constantly transfers the two forces to each molecule, After a certain elastic deformation (the inevitable process of intermolecular force transfer), the force on each molecule will be balanced (strictly speaking, considering the potential field change caused by thermal motion, quantum effect, etc., the force on the molecule may not be balanced)

3. Several forces act on the same object. If the object is at rest or moving in a straight line at a constant speed, the effects of these forces will cancel each other. We call these forces balanced. Judge the balance force: 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 And the resultant force is zero) * Note: distinguish it from the interaction force!

4. D. The gravity of the earth and the supporting force of the ground on people
you just need to remember that the balance force acts on the same object

5. 1. A pair of balance forces. The actual problem of balance forces depends on the actual situation. Gravity can be a pair of balance forces with supporting force, or can be a pair of balance forces with electric field force, elastic force, electromagnetic force, a component of a force, etc, You can't judge the force it is subjected to.
2, the result of weighing is your symmetrical pressure, which is the same as gravity in size, so its value is equal to gravity. Spring scale: it is the spring force. Note: about the problem of indication, who has indication to analyze the force on who.
3, the balloon rising into the sky is of course the gravity direction of the balloon, the vertical downward direction, the air resistance, and buoyancy, There is also the tension of the gas inside the balloon on the ball; Because it is an effect force, in fact, it is formed by the pressure of the balloon up and down.
4, friction and what force is a pair of balance force. As I said above, it depends on the actual situation.
5, when walking, it receives gravity, supporting force and static friction force.
6, gravity is a non-contact force, and balance force depends on the actual situation

6. Several forces act on an object. If the object is at rest or moving in a straight line at a constant speed, the effects of these forces will cancel each other. We call these forces balanced
judging balance: from motion state
balance state: static state and uniform state
the drawing time of balanced force is the same