Weight, apparent weight, and weightlessness | AP Physics | Khan Academy

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The gravitational force exerted by an astronomical body on a relatively small nearby object is called weight. The magnitude of the apparent weight of an object is the magnitude of the normal force exerted on the object. If the system is accelerating vertically, the apparent weight of the object is not equal to the magnitude of the gravitational force exerted on the object. A system appears weightless when there are no forces exerted on the system, or when the force of gravity is the only force exerted on the system.

Sections:
00:00 - Intro
00:23 - Weight
04:45 - Apparent weight
08:53 - Weightlessness
09:43 - Equivalence principle

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