The ball is staying in one position. This is because the balls inertia is keeping it static
The ball is moving because there is an unbalanced amount of forces acting on the ball. The football player kicks the ball which provides force to the ball which over comes its inertia therefore making it move.
The ball is being acted on by another outside force this means the ball will stop. The goalkeeper is acting as an opposite force this means that the goal keeper is applying force in the opposite direction the ball is going meaning the ball will stop