Inertia is the fundamental property of an object that resists any change in its state of motion, whether it's at rest or moving. It is a measure of an object's mass. While not distinct "types" in the sense of different forces, inertia manifests in two primary ways: Inertia of Rest: This is the tendency of an object to remain stationary if it is currently at rest. For example, a book on a table will stay there unless pushed or pulled. Inertia of Motion: This is the tendency of an object to continue moving at a constant velocity (same speed and direction) if it is already in motion. For example, passengers in a moving car lurch forward when the car suddenly brakes.