A box is on Callisto (2nd largest moon of Jupiter). The box weighs 36 lb and is in free fall. How much force is the box exerting on Callisto and in what direction?

Answer 1

If it weighs 36 pounds on Callisto it exerts a force of 36 pounds on Callisto
toward the box from the center of the moon.
Pounds is FORCE, not mass, and if you weighed it in pounds on Callisto with a scale, that is the gravitational force on it there.