Final answer:
The friction force on the force diagram of a soccer ball that has been kicked is represented by the arrow labeled Fw = 13.0 N, pointing left, assuming the ball is moving to the right.
Step-by-step explanation:
In the context of a force diagram and the forces acting on a soccer ball immediately after it is kicked, which arrow represents the friction force should be inferred from the provided details. In force diagrams, friction is the force that opposes the direction of motion or attempted motion between two surfaces in contact. Given the scenario where a soccer ball is kicked and rolls across the ground, friction would be acting in the direction opposite to the ball's motion. In the diagram you described, with arrows labeled as Fb (force due to buoyancy), Fg (force of gravity), Fc (9.0 N to the right), and Fw (13.0 N to the left), assuming that the soccer ball is moving to the right immediately upon being kicked by Jess, the friction force would be Fw = 13.0 N pointing left as it is the force opposite the direction of the ball's motion (to the right). Disparities in the force values often indicate friction since it typically hinders motion and requires a strong enough force to overcome in order for the object to continue moving.