Equilibrium: Defination:
The state of abody in which under the action of several forces acting together . There is no change in translatioal motion as well as rotational motionis called equilibrium.
Types of Equilibirum:
1. Static equilibrium
2- Dymamic equilirbium
1- Static Equilibrium: When a body s at rest under the action of seveal forces acting together and several torques acting, the body is said be in static equilibrium.
Example: For example, a book is resting on the table and two forces are acting on it i.e. weight of book and reaction force of table. Both forces are equal to magnitude but opposite indirection, So, the net force is zero and the book is said to be in state of static equilirbrium.
2- Dynamic Equilirbirum:
When a body is moving at uniform velocity under action of servaral forces acting together , the body is said to be in dynamic eequilibrim.
Dynamic equilibium is further divided into two types.
1- Dynamic translational equilibrium
2- Dynamic Rotational Equilibrium.
1- Dynamic Translational Equilibrium:
When a body is moving with uniorm linear velociyt., theobdy is said to be in dynamic translational equilibrium.
Example: For example, a paratrooper falling, down with constantvelocity is instate of dynamic translational equilibiurm.
2- Dynamic Rotational Equilibrium:
When a body is moving with uniform rotation, the body is said to be dynamic rotational equilibrium.
Example: For example, a Compact disk rotationg in CD player with constant angular velocity is in state of dynamic rotational equilibriu.