STABILITY :

* STABILITY IS THE MEASURE OF THE BODY ABILITY TO MAINTAIN ITS ORIGINAL POSITION .

* STABILITY IS CLASSIFIED INTO THREE TYPES. THEY ARE :

* STABLE EQUILIBRIUM
* UNSTABLE EQUILIBRIUM
* NEUTRAL EQUILIBRIUM

STABLE EQUILIBRIUM :

* THE FRUSTUM CAN BE TILTED THROUGH QUITE A BIG ANGLE WITHOUT TOPPLING .

* HERE FRUSTUM MEANS WHEN WE CUT A PORTION OF A CONE
THE SHAPE WE GET IS CALLED FRUSTUM.

* TOPPLING MEANS THE FORCE THAT IS APPLIED TO THE BODY OF THE SMALLER BASE AREA .

DEFINITION FOR STABLE EQUILIBRIUM :

* IN THE STABLE EQUILIBRIUM THE FRUSTUM CAN BE TILTED THROUGH A QUITE BIG ANGLE WITHOUT TOPPLING .

* ITS CENTRE OF GRAVITY IS RAISED AND DISPLACED AND THE VERTICAL LINE THAT IS PASSING THROUGH THE CENTRE OF GRAVITY . SO IT CAN RETURN TO ITS ORIGINAL POSITION .

UNSTABLE EQUILIBRIUM :

* THE FRUSTUM WILL TOPPLE WITH THE SLIGHTEST TILTING .

* ITS CENTRE OF GRAVITY IS VERY LOW AND IT IS DISPLACED .

* THE VERTICAL LINE PASSES THROUGH ITS CENTRE OF GRAVITY FALLS OUTSIDE ITS BASE .

NEUTRAL EQUILIBRIUM :

* THE FRUSTUM WILL ROLLS ABOUT BUT DOES NOT TOPPLE . ITS CENTRE OF GRAVITY REMAINS AT THE SAME HEIGHT WHEN IT IS DISPLACED .

* THE BODY WILL STAY IN ANY POSITION TO WHICH IT HAS BEEN DISPLACED .

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