In this video, one of the demonstrations was the guy pulled back the chair with a stack of books on it and pushed it against another chair. What happened was the moving chair hit the other chair causing the moving chair to stop and the books to keep going yet stay on top of each other, then they crashed into the wall to fully stop. That demonstration showed Newton's law of an object in motion tends to stay in motion unless stopped by a force. The object in motion was the chair with/and books, and the force that stopped the chair was the other chair, but the force that stopped the books was the wall, and they stayed on each other.
Interesting videos of inertia! Its cool to see under many circumstances the law still standing. It just proves that any object that is in motion or at rest will continue in its states.
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