Since the force is a vector quantity so we should define both the magnitude and the direction.
Force is defined as the external effort on any body try to displace it from its position also stops the moving body to the rest.
Since force is a vector quantity it is required to define both the direction and magnitude for the force.
knowing the direction of a force is important because it helps someone know the motion of the object. if you use a free body diagram, then it becomes easy to see all the forces being applied to an object.
if there is more force going one way, the object is accelerating in that direction. if all the forces cancel each other out, then the object is at a constant speed or is at rest.
hence knowing the direction of the force is important.
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