Equilibrium of Concurrent Forces

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Equilibrium of Concurrent Force System

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What is the Equilibrium of Concurrent Forces?

In order to understand the Equilibrium of a concurrent force system, the first thing is to understand what is equilibrium. Equilibrium can be called the state of the body where all the forces acting on the body are balanced. This gets cancelled out, making the net effect zero.


Concurrent forces refer to those forces which intersect through a common point. When it comes to concurrent forces, we can add them together as vectors and this gives the net resultant. A key point to remember is that acceleration is zero when a body is in a state of equilibrium. This is one of the conditions of Equilibrium for concurrent forces.


What are the Types of Equilibrium of Concurrent Forces?

There are two major types of equilibrium of concurrent forces. These include Static equilibrium and dynamic equilibrium. In static equilibrium, the state of the body is such that all the resultant forces add up to zero. The acceleration and velocity are both zero.


In dynamic equilibrium, the net result is zero, however, velocity is not. For example, a block resting on the floor can be said to be in static equilibrium. A block attached to a string in Simple Harmonic motion can be an example of dynamic equilibrium.

This is the simple way to define the Types of equilibrium of concurrent forces.


The Coplanar Forces in Equilibrium

Coplanar forces can be defined as forces that act on the same plane. There are certain conditions for Coplanar Forces to be in equilibrium. These include:

  1. The sum of forces must be zero.

  2. The sum of the moments of the forces about a point in the anticlockwise direction is equal to the sum of the moments of the forces about the same point in the clockwise direction.

It is important to note that there are various kinds of coplanar forces. In concurrent coplanar forces of equilibrium, the forces in one plane must intersect at one point. It can be calculated using graphical and algebraic methods.


The other types of coplanar forces are non-concurrent and parallel coplanar forces. In non-concurrent coplanar forces, the vectors do not meet at one point and are not parallel. In the case of parallel coplanar forces, the forces are all parallel to each other.

Hope you have received some basic information about the Equilibrium of concurrent forces.


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Solved Example

Q1: What are the conditions required for coplanar forces in equilibrium?

  1. Sum of all forces in X-direction should be equal to zero.

  2. Sum of all forces in Y-direction should be equal to zero.

  3. Both A and B.

  4. Neither A nor B.

Ans: c) Both A and B.


Fun Fact:

The theory of equilibrium of concurrent forces can be explained using Newton's first law and second Law of motion.

FAQ (Frequently Asked Questions)

Q1. What are the Conditions for Equilibrium of Concurrent Forces?

Ans: It is essential that students understand the application of equilibrium of concurrent forces effectively to gain knowledge about the concept. Equilibrium is a state of the body where all the forces are of the same magnitude making the net resultant zero. When it comes to the equilibrium of concurrent forces, the same concept is applied where the sum of all the forces in the x-direction and y-direction is zero. This is called static concurrent equilibrium. In dynamic concurrent equilibrium, the difference is that the vector is not zero. These are the two types of concurrent equilibrium forces.

Q2: What do you Mean by Coplanar Forces?

Ans: Coplanar forces are the forces on one plane. There are various types of coplanar forces that a student must be aware of. These include:

  1. Concurrent Coplanar Forces: All forces must intersect at one point in the plane.

  2. Non-Concurrent Coplanar Forces: The vectors do not intersect at a point and are not parallel to each other either.

  3. Parallel Coplanar Forces: Here, the forces are all parallel to each other.

Concurrent coplanar forces are those forces that intersect at one point. This is an important condition and must be applied at all times to master the concept of coplanar forces.