Forces and free-body diagrams | AP Physics | Khan Academy

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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

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