Given the fact that:  The full box is harder to move because it has greater mass and therefore greater inertia.  Answer the question:   Rita added less food to the box. It is now harder or easier to move?
easier

Given the fact that:  When a person smokes there are chemicals released by the tobacco that enter the lungs. Because the lungs have to work harder to remove the chemicals, the body has to work harder to get the air needed to survive.  Answer the question:   If Mona is a smoker, but decides to stop smoking, what happens to the difficulty her lungs experience in removing chemicals from the air increase or decrease?
decrease

Given the fact that:  Muscles that are exercised are bigger and stronger than muscles that are not exercised.  Answer the question:   Jimbo liked to work out a lot, while James never worked out. Which person would have weaker muscles Jimbo or James?
James