Mechanical Equilibrium is further of two types:
Static Equilibrium: Equilibrium where bodies
are at rest is known as static equilibrium. Dynamic Equilibrium: Equilibrium where bodies are moving at constant velocity known as dynamic equilibrium. In both cases, the net force acting on them is zero.
What are the two conditions for mechanical equilibrium?
Conditions for equilibrium require that
the sum of all external forces acting on the body is zero (first condition of equilibrium), and the sum of all external torques from external forces is zero (second condition of equilibrium)
. These two conditions must be simultaneously satisfied in equilibrium.
What is mechanical equilibrium state?
Definition. A
state of a physical system at rest or in unaccelerated motion
, and where the sum of all forces and torque acting on each particle of the system is zero.
What is the difference between stable unstable and neutral equilibrium?
Unstable Equilibrium:
If the body does not return to its original position but moves further from it
. Neutral Equilibrium: If the body neither returns to its original position nor increases its displacement further, it will simply adopt its new position.
What types of mechanical equilibrium are there?
There are three types of equilibrium:
stable, unstable, and neutral
.
What are the three conditions of equilibrium?
- The lines of action are coplanar (in the same plane)
- The lines of action are convergent (they cross at the same point)
- The vector sum of these forces is equal to the zero vector.
What is an 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.
What is second condition for equilibrium?
The second condition necessary to achieve equilibrium is that
the net external torque on a system must be zero
: netτ=0. By convention, counterclockwise torques are positive, and clockwise torques are negative.
What is the first condition of equilibrium?
The first condition of equilibrium is that
the net force in all directions must be zero
.
What is SI unit of couple?
A couple is a pair of forces, equal in magnitude, oppositely directed, and displaced by perpendicular distance or moment. The simplest kind of couple consists of two equal and opposite forces whose lines of action do not coincide. … The SI unit for the torque of the couple is
newton metre
.
What is mechanical equilibrium example?
A paperweight on a desk is an example of static equilibrium. … Another example of mechanical equilibrium is
a person pressing a spring to a defined point
. He or she can push it to an arbitrary point and hold it there, at which point the compressive load and the spring reaction are equal.
What are the conditions for mechanical equilibrium?
In terms of momentum, a system is in equilibrium
if the momentum of its parts is all constant
. In terms of velocity, the system is in equilibrium if velocity is constant. In a rotational mechanical equilibrium the angular momentum of the object is conserved and the net torque is zero.
What is physical equilibrium?
Physical equilibrium can be defined as
the equilibrium which exists between different phases or physical properties
. In such processes, chemical composition and properties are not changed. It also represents the existence of the same substance in two or more different physical states.
What are the examples of stable equilibrium?
A book lying on a horizontal surface
is an example of stable equilibrium. If the book is lifted from one edge and then allowed to fall, it will come back to its original position. Other examples of stable equilibrium are bodies lying on the floor such as chair, table etc.
What are the 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.
How do you find stable equilibrium?
To find equilibria we have to solve the equation:
dN/dt = 0
: This equation has two roots: N=0 and N=K. An equilibrium may be stable or unstable. For example, the equilibrium of a pencil standing on its tip is unstable; The equilibrium of a picture on the wall is (usually) stable.
