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# What are examples of inertia?

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Typical examples of inertia include a passenger's body slightly moving backwards when a vehicle suddenly starts; a passenger's body leaning forward when a moving vehicle stops and a passenger's body jerking to the side when a vehicle maneuvers a sharp turn. Inertia is one of the defining characteristics of matter, which refers to the tendency of any object to remain at rest or continuously move along a straight line.

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Inertia is classified into three types: inertia of rest, inertia of motion and inertia of direction. A leaf falling from the branch of a tree that is disturbed by a strong wind is an example of inertia of rest. A person that falls down after carelessly jumping off a moving train is an example of inertia of motion. Mud that sticks to rotating wheels and are thrown tangentially is an example of inertia of direction.

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## Related Questions

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Inertia is the tendency for an object to remain in motion or at rest unless it is acted upon by an outside force. In the field of physics, this concept is referred to as Newton's first law of motion.

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The law of inertia is a fundamental physics principle used to describe how an object behaves in motion or at rest, particularly when forces are applied to it. The object can be anything that has mass.

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The SI units for moment of inertia are kg m^2. For a point mass, the moment of inertia equals mass times radius squared, so other mass units (such as pounds) and other distance units (such as feet) are occasionally used instead.

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One example of the law of inertia is that a package thrown from a plane will move as fast as the plane in the same direction. The law of gravity affects the package, and while the horizontal axis speed is the same as the plane, the vertical axis speed increases.