Counterbalance force

Physical terms

open 2 entries with the same name

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

If an object remains stationary or moves at a uniform speed in a straight line under the action of several forces, the effects of these forces cancel each other, and we say that these forces are balanced.

Chinese name: Counterbalance force
Foreign name: Balance force
Classification: Multi force balance and two force balance

Judgment: Two forces act on the same object (same body)
Difference: Both forces are equal in magnitude and opposite in direction
Conditions: Same object, same size, opposite direction
Reaction force: Have simultaneity, produce at the same time, change at the same time

catalog

five Equilibrium state

brief introduction

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judge

1. Two forces act on the same object. (same body)

2. Each pair of forces or each pair Resultant force On the same line, the direction is opposite and the size is equal. (That is, the resultant force is zero) (equal, same line, different direction, same object)

3. This object is in Quiescent state or Uniform linear motion state 。 (and Interaction force Difference)

classification

The balance force is also divided into multi force balance and Two force balance The condition for the balance of two forces is that the two forces are equal in size, opposite in direction, acting on a straight line, and acting on the same object. Multi force balance is similar.

difference

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A pair of common characteristics of balance force and "force and reaction force":

Both forces are equal in magnitude and opposite in direction, acting on the same straight line. It is also because of this that students often confuse these two concepts.

Their differences are obvious:

First of all, the essence of the two concepts is different. Force vs Reaction force It describes the law of interaction between two objects. A has a strong effect on B, and B must also have a strong effect on A; The balance of two forces describes the position of an object under the action of two forces Equilibrium state Two force characteristics of.

Secondly, the two forces of force and reaction have the same nature. They are either gravity, elastic force or friction force; However, the balance of two forces is not the same. As long as the two forces act on the same object in the same size and opposite direction, acting on the same straight line, it is the balance force, regardless of the nature of the two forces.

The re acting force and the reaction force are simultaneously generated, changed and disappeared; Two force balance does not have this feature.

condition

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1. Force size identical

2. Direction contrary

3. The action (point) is on the same straight line