Inertia

I think as Moms we are pretty familiar with the concept of objects in motion staying in motion and objects at rest staying at rest. Often it is the kids who are staying in motion and we are the ones trying to stay at rest. Other times though it is us constantly in motion (cooking, cleaning, picking up...) while it seems everyone else in the family is staying "at rest". This has to do with inertia. Inertia measures how hard it is for a force to move an object. The lemon in this case has a high inertia because it is heavier, the column it is resting on has a low inertia. The low inertia lets the column move easily while the lemon falls (is pulled by gravity) right where it is.