Equilibrium of force // laws of equilibrium of force //theory of equilibrium

Equilibrium of force - 
                       
                            Many forces acting on a pined or point ,if the net effect is zero and force does not treats a pair ,then it will be said to be in equilibrium , because there is no net force acting on an object  in equilibrium. Then from newton's first law of motion an object at rest will stay at rest and an object in motion will stay in motion .
 
Equilibrium condition-
     All forces acting on one side  = forces acting on opposite direction with same magnitude with include all forces 

Law of equilibrium of forces -
                          The following two rules for forces to be in equilibrium state__

(1) The algebraic sum of all forces acting on a body in any direction will be zero ke if, ΣF =0
(2) All forces acting on a body are algebraic at any point in the plane .the sum of rotor will be zero  ie  if ΣF × x= 0,

Equilibrium theory -
        
(1) Equilibrium theory of two forces - According to this theory ,if two forces acting on a body and the body remain in equilibrium then these forces of each other. There will be equal and working in the opposite direction and a linear or colinear .

(2) Equilibrium theory of three forces-  According to this theory , if a body remain in equilibrium when three forces will be equal and opposite to the third force and will Align .


(3) Equilibrium theory of four forces-According to this theory , if a body remain in equilibrium when four forces work ,then the resultant forces of any two forces will be equal and opposite to the resultant forces of the other two force acting and will colinear .



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