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 simultaneously. A free-body diagram is a model that shows each of the external forces exerted on an object. Forces are represented as vector arrows originating from the representation of the center of mass, such as a dot. A free-body diagram is useful for determining the net force on an object, which is the vector sum of all the individual forces acting on the object. Sections: 00:00 - Intro 00:11 - Types of forces 05:06 - Free-body diagram practice 1 09:06 - Free-body diagram practice 2 ------------------ 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