Inertia Resource

What is Inertia? As a viewer in need of a last minute comprehension lesson these videos recap what my class and I have recently learned about Inertia and Newtons First Law.  
Newton's first law of motion states that "An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force." Objects tend to "keep on doing what they're doing." In fact, it is the natural tendency of objects to resist changes in their state of motion. This tendency to resist changes in their state of motion is described as inertia. Inertia: the resistance an object has to a change in its state of motion.