This is an extremely complex question, and replying to it lies outside the scope of WikiAnswers. The ball is subject to the application of energy at all times. It is kicked and it changes course in flight according to its aerodynamics and the forces applied. The players expend energy every second to participate in the game. Even when they are not in motion, they are breathing and thinking (hopefully). When the ball is in play and the dynamics of the game "take over" in a way that makes the game exciting, the players are using muscular energy in an attempt to defy physical limits on play and get the ball into the net (or keep it out of the net, depending which team one is on).
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Potential energy is when the soccer ball is at it's peak in the air.
check this site for image
http://www.greenscreen.org/articles_sr/EnergyPotentialAndKinetic.htm