Force - Mechanics:
Sometime we push the wall, then there are no changes in position of wall, but no doubt we apply a force, as the applied force is not sufficient to move the wall, that is no motion is produced. So this is clear that a force may not produce necessarily a motion in a body.
The force is agency, which tends to change the state of rest or motion of a body, it is vector quantity.
A force is completely defined when the following four characteristics are specified- Magnitude, Point of application, Line of action and Direction of it.
The action of one body on another body can be defined as force. In mechanics, applied forces are divided in to two types: Tensile and compressive force.