Tuesday, November 10, 2009

Mass and Weight

Mass and weight are often confused. In physics, the mass of an object is the amount of matter in it. Mass is measured in kilograms (kg). Weight is the pull of gravity on an object. Weight is a force. It is measured by both the mass and gravity. It is measured in units called Newton (N). The mass of an object is always the same, but its weight can change.

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