STATICS
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Statics
   Statics is the branch of mechanics which deals with the study of bodies at rest under a number of    forces, the equilibrium, conditions of equilibrium, types of equilibrium and torque etc.
Equilibrium
   A body is said to be in equilibrium if it is at rest or moving with uniform velocity.
   In other words if the linear and angular acceleration of a body are zero, the body is said to be in    equilibrium.
   Or we can say that when two or more forces act on a body such that their resultant or combining effect    on the body is Zero and the body retains its state of rest or of uniform motion then the body is said to    be in equilibrium.
Example
   A book lying on the table, suspended bodies, all stationary bodies , jump by using parachute.
Types of equilibrium
   With respect to the state of a body, equilibrium may be divided into two categories:
   1. Static equilibrium.
   2. Dynamic equilibrium.
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Static equilibrium
   If the combined effect of all the forces acting on a body is zero and the body is in the state of rest then    its equilibrium is termed as static equilibrium.
   For example: All stationary bodies
Dynamic equilibrium
   when a body is in state of uniform motion and the resultant of all the forces acting upon it is zero then it    is said to be in dynamic equilibrium.
   For example: Jump by using parachute.
Conditions of equilibrium
   There are two conditions of equilibrium are as follows
First condition of equilibrium
   The first condition of equilibrium stated as follow:

   To maintain the transitional equilibrium in a body the vector sum of all the forces acting on the body is    equal to zero
   i.e.

   In other words we can say that to maintain equilibrium the sum of all the forces acting along X-axis is    zero and the sum of all the forces acting along Y-axis is zero.
   i.e.
Second condition of equilibrium
   The second condition of equilibrium stated as follow:
   A body will be in rotational equilibrium when the algebraic sum of clock wise torque and anti clock wise    torque is zero.
   In other words:
   A body will be in rotational equilibrium if vector sum of all the torque acting on the body is zero.
   For latest information , free computer courses and high impact notes visit : www.citycollegiate.com
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