What is the relationship between the amount of force this player applies to the soccer ball and the motion of the ball? How might a force be applied without causing any motion on the ball?

The player then exerts a force that is equal in magnitude (the size of a force) and opposite in direction. This slows down the ball

Explanation:

you can use friction friction (a force applied on the ball in the opposite direction to its motion), but the direction of its motion will remain the same.