Inertia is the natural tendency of an object to resist changes in its motion. If something is at rest, it wants to stay at rest. If it’s moving, it wants to keep moving at the same speed and in the same direction—unless something forces it to change.
This simple but powerful concept explains everything from why passengers lurch forward when a car brakes to why planets stay in motion around the sun.
In this guide, you’ll learn what inertia is, why it happens, and how it shapes everyday life.
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