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 ball. Observation 2: In this case apply the force of same magnitude but in 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 effect of a force can be experienced by a change in it's direction as well as magnitude. The above statement is :-

 In the above two observations it is clear that the change in direction of force in the second observation made the team cost four runs. So, either a change in direction or magnitude of a forces causes a change in its effect.

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