Inertia explains why the top books drop when one is removed quickly and why passengers move forward when a bus stops suddenly.
Inertia is the tendency of objects to resist changes in their motion. When a book is pulled out quickly from the middle of a pile of books, the books at the top drop due to their inertia, remaining at rest until acted upon by an external force. Similarly, when a moving bus stops suddenly, the passengers move forward due to their inertia, continuing their forward motion even though the bus has stopped.
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