The equilibrium equations (balance of linear momentum) are given in index form as(1.4)σji,j+bi=ρu¨i,i,j=1,2,3where σij are components of (Cauchy) stress, ρ is mass density, and bi are body force components.

**Table of Contents**show

## What are the 3 equations of equilibrium?

In order for a system to be in equilibrium, it must satisfy all three equations of equilibrium, Sum Fx = 0, Sum Fy = 0 and Sum M = 0.

## What are the three conditions for static equilibrium?

What are the conditions for a body to be in Static Equilibrium? Two conditions of equilibrium must be satisfied to ensure that an object remains in static equilibrium. Firstly, the net force acting upon the object must be zero. Secondly, the net torque acting upon the object must also be zero.

## What is the formula for static equilibrium?

The first equilibrium condition for the static equilibrium of a rigid body expresses translational equilibrium: ∑k→Fk=→0.

## What is static equilibrium in physics?

Static equilibrium is a state where bodies are at rest; dynamic equilibrium is a state where bodies are moving at a constant velocity (rectilinear motion). In both cases the sum of the forces acting on them is zero.

## How do you solve a static equilibrium problem?

- Identify the object to be analyzed.
- Set up a free-body diagram for the object.
- Set up the equations of equilibrium for the object.
- Simplify and solve the system of equations for equilibrium to obtain unknown quantities.

## What is a static equilibrium explain with an example?

Static equilibrium occurs when there is no exchange between reactants and products. An example of static equilibrium is diamond turning into graphite. C(diamond) ⇌ C(graphite)

## What are 2 conditions of equilibrium?

The sum or resultant of all external forces acting on the body must be equal to zero. The sum or resultant of all external torques from external forces acting on the object must be zero.

## What is the first condition of static equilibrium?

The first condition necessary to achieve equilibrium is the one already mentioned: the net external force on the system must be zero. Expressed as an equation, this is simply. net F=0. Note that if netF is zero, then the net external force in any direction is zero.

## Why is static equilibrium important in physics?

Static equilibrium is a valuable analysis tool: for example, if two forces are acting on an object that is in static equilibrium, that means they add up to zero. If you know the direction and magnitude of one of the forces, you can write an equation to determine the magnitude and direction of the unknown force.

## What are the two types of equilibrium in physics?

Type of Equilibrium. Equilibrium is classified as dynamic equilibrium or static equilibrium.

## What causes static equilibrium?

Static equilibrium of a rigid body is the state where a solid object isn’t moving because its influences are balanced. Those influences are forces and torques. For an object to be in static equilibrium, it must be in both translational equilibrium and rotational equilibrium.

## What is difference between static and dynamic equilibrium?

Answer: The major difference between static and dynamic equilibrium is that in a static equilibrium the body is motionless, while in dynamic equilibrium, the body moves at a constant velocity.

## What is an example of static equilibrium in everyday life?

An example of equilibrium in everyday life is a book on a table at rest. Here the weight of the book and the reaction force exerted by the table on the book cancel each other thus keeping the book in static equilibrium.

## Which are true for an object in static equilibrium?

For an object to be in equilibrium, it must be experiencing no acceleration. This means that both the net force and the net torque on the object must be zero.

## What is torque and what is the condition for static equilibrium?

rotational equilibrium: A state in which net torque is equal to zero. static equilibrium: The state in which a system is stable and at rest. To achieve complete static equilibrium, a system must have both rotational equilibrium (have a net torque of zero) and translational equilibrium (have a net force of zero).

## How do you calculate torque for static equilibrium?

- τ = r F = |r||F| sin(θ rF) (direction given by the Right Hand Rule)
- τ = Fr perpendicular
- τ net = Iα
- F net = ma.
- ( 5 ) Στ net = 0 ΣF net = 0.
- ( 6 ) Στ = 0,

## How do we calculate elasticity of demand?

How to Calculate Price Elasticity. To calculate price elasticity, divide the change in demand (or supply) for a product, service, resource, or commodity by its change in price.

## How do you create an equilibrium equation?

## What is the example of equilibrium?

An example of equilibrium is in economics when supply and demand are equal. An example of equilibrium is when you are calm and steady. An example of equilibrium is when hot air and cold air are entering the room at the same time so that the overall temperature of the room does not change at all.

## Why graphite and diamond is a static equilibrium?

Static equilibrium – also called mechanical equilibrium, occurs when all particles in the reaction are at rest and there is no motion between reactants and products. An example of static equilibrium is graphite turning into diamond which is an irreversible reaction.

## What is relation between KP and KC?

Relationship between Kp and Kc is given by Kp= Kc (RT)Δn , where Kp and Kc are the equilibrium constants for an ideal gaseous mixture.

## What are the 4 features of a system in a state of dynamic equilibrium?

(a) The concentration (or pressure) of reactants and products remains constant (or unchanged) over time. (b) The rate of forward reaction is equal to the rate of reverse reaction (both forward and reverse reaction proceed at an equal rate). (c) Reaction quotient (Q) is equal to the equilibrium constant (K).

## Can a moving object be in static equilibrium?

An object moving at constant speed in a straight-line path is also in a state of equilibrium. Once in motion, if there is no net force to change the state of motion, it is in equilibrium.

## What is the formula of tension?

Tension formula is articulated as. T=mg+ma. Where, T= tension (N or kg-m/s2) g = acceleration due to gravity (9.8 m/s2)