About Force

 Force may be defined as an agent which produces or tends to produce, destroy or tends to destroy the motion of body. A force acting on a body may 

(1) Change the motion of body ,

(2) Retard the motion of body,

(3) Balance the forces already acting on a body, and 

(4) Give rise to the internal stresses in a body.

In order to determine the effects of a force acting on a body , we must know the following characteristics of a force: 

(a) the magnitude of the force, 

(b) the line of action of the force,

(c) the nature of the force i.e. push or pull , and

(d) the point at which the force is acting.

units 

in MKS system kg.force.

   SI system  newtons 

1 kgf = 9.81N