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10 questions from this quiz
No net motion from forces and couples
All forces lie in the same plane
Zero resultant force and zero total moment
Three equations
Perpendicular to surface, no friction
To eliminate them from moment equation
∑Fx=0\sum F_x = 0∑Fx=0, ∑Fy=0\sum F_y = 0∑Fy=0, ∑M=0\sum M = 0∑M=0
M=r×F\mathbf{M} = \mathbf{r} \times \mathbf{F}M=r×F
Resultant force zero, total moment non-zero
Horizontal and vertical (perpendicular)
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