Work done by forces (part 1) | AP Physics | Khan Academy

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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now. https://www.khanacademy.org/science/ap-physics-c-mechanics Work is the amount of energy transferred into or out of a system by a force exerted on that system over a distance. Work is a scalar quantity that may be positive, negative, or zero. Only the component of the force exerted on a system that is parallel to the displacement of the point of application of the force will change the system’s total energy. The work-energy theorem states that the change in an object’s kinetic energy is equal to the sum of the work (net work) being done by all forces exerted on the object. Sections: 00:00 - Intro 01:13 - Defining work in physics 05:21 - Work-energy theorem 06:22 - Applying the work-energy theorem 10:42 - Sense check ------------------ 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

Published 2026-07-14 · Watch on YouTube ↗
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