Intro to forces (part 2) | Physics | Khan Academy

A free body diagram (FBD) models the forces acting on an object. The object is replaced by a square. The individual force vectors are shown as arrows, and magnitudes usually measured in newtons. To determine the net force in the horizontal (x) or vertical (y) direction, add forces pointing in the same direction, and subtract forces in the opposite direction.

Sections:
00:00 - Intro
00:44 - Properties of forces (vectors, units)
02:15 - How to construct a free body diagram (FBD)
04:27 - Find net force from a FBD
07:01 - FBD of forces on a chair
07:55 - Net force on the chair

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