Since an unrelaxed string is not attached to the ball, there is not a tension force on it. Depress mouse to view answer. Normal is Absent. Since the ball is not supported by any surface, there is not a normal force on it. Depress mouse to view answer.
Friction is Absent.
Since the ball is not in contact with another surface, there is not a friction force on it. Depress mouse to view answer. Air Resistance is Present. Since the ball is moving relative to the surrounding air, there is an air resistance force on it. Consider the forces acting on the skydiver.