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

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/ap-college-physics-1 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 ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc