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Forces and free-body diagrams | 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 A force is a vector quantity that describes a push or pull. A variety of contact forces (e.g., normal force, friction) and non-contact forces (e.g., gravity) may act on an object ...
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