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

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.  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

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