Observation 1: Try to stop a ball coming towards you, so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of the ball.
Observation 2: In this case apply the force of the same magnitude but in the same direction of the motion of the ball.
In observation 1 boy saves a boundary by applying a force opposite to the direction of motion but in observation 2, the change in direction of force cost the team 4 runs as the change in direction of force pushed the ball further to the boundary. So, the change in the effect of a force can be experienced by a change in its direction as well as magnitude.
The above statement is:-
Observation 1-
Observation 2-
The statement given to us is true.
Therefore we can say that the change in the effect of a force can be experienced by a change in its magnitude as well as in its direction.