Running while kicking, passing, or catching a ball is extremely skillful and must be practiced to be developed. 3- Speed is distance over time. We are all aware of kilometres per hour, or miles per hour. Running speeds are sometimes mentioned in metres per second. Speed is obviously extremely important in all forms of racing, but also in team and goal related sports when someone has the chance to 'runaway' from the opposition.
Power is the ability to exert force quickly.
You can be very strong but not as powerful someone who is weaker but faster in the way they react. Power must have a speed component applied to it if you are trying to increase this. The following references provide supportive information for further study or clarification of the material in this article. Fitness and Sports medicine by David Nieman, Bull Publishing Company.