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What is inertia in physics? Inertia is
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the property of a body that resists any
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change in its state of rest or uniform
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motion. Inertia explains why an object
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remains at rest or continues moving at a
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constant velocity unless acted upon by
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an external force. It is closely related
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to mass. The greater the mass of an
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object, the greater its inertia. There
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are different forms of inertia including
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inertia of rest, inertia of motion, and
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inertia of direction. Inertia is the
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reason objects do not start moving,
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stop, or change direction on their own.
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Imagine sitting in a car. When the car
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suddenly stops, your body moves forward.
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This happens because your body tends to
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continue in its state of motion due to
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inertia. Examples: A book remaining at
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rest on a table. Passengers moving
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forward when a vehicle stops suddenly. A
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moving ball continuing to roll until
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friction stops it. Difficulty in pushing
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a heavy object compared to a light one.
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Objects resisting changes in motion.
