force is applied to make an object stop, move etc. thrust is also a force acting on an object perpendicularly.pressure is the effected force area means the area effected by the force applied. 
   pressure = force/ area .
if we apply same force on two objects and if area is increased then the pressure will be more and if the area is reduced the pressure will be less .
 this is due to the fact that pressure is indirectly proportional to the area where it acts.
            i hope that this will help u.