Force

in the direction of

the objects motion

in a direction other

than that of the

obiects motion

Force in the direction of the objects motion = Acceleration

Force in a direction other than that of the objects motion = Deceleration

Explanation:

Force - a push or a pull that is applied on an object.

Motion - change in position of an object.

When force is applied in the direction of the moving object, it is called as Acceleration.

When force is applied in the opposite direction of the moving object, it is called as Deceleration.