Potential Danger Presented by Loose Objects in a Vehicle

The potential dangers of loose objects in vehicles are strongly associated with Newton's First Law of Motion, inertia.
Inertia is when an object in motion tries to stay in motion, and an object at rest tries to remain at rest, unless the object is acted upon by an outside force.
For example, say a car is traveling along a straight road.
Loose objects in the auto are "acted upon" by the body, seats, or some other part of the vehicle (whatever is touching a loose object), whenever the whole thing accelerates. The two most important things related to this are:
1. "Velocity" is a concept that includes both the speed and the direction of motion
2. "Acceleration" exists whenever there is any change in a velocity
Let us first return to the straight road, and magically do two things:
1) Stop the car instantly.
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