Three-Dimensional Force Systems 1” = C


F x =F cos θ x

F y = F cos θ y

F z = F cos θ z


Three-Dimensional Force Systems 2” = C


Thus these are the unit vectors of the points x, y, and z directions respectively.

Therefore, θx, θ y, θ z are the angles made by F with the axis x, y, and z(the rest is referred to the chapter vector algebra)


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