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10 cards from this deck
No net motion; all forces and couples balanced
All forces lie in the same plane
Resultant of all forces = 0 (no linear movement)
Total moment = 0 (no rotational movement)
Perpendicular to surface only; no friction
Both normal reaction and friction forces
Where unknown forces act (eliminates them from equation)
∣a∣∣b∣sinθ n|\mathbf{a}||\mathbf{b}|\sin\theta \, \mathbf{n}∣a∣∣b∣sinθn
M=r×F\mathbf{M} = \mathbf{r} \times \mathbf{F}M=r×F
Resultant force = 0, but total moment ≠ 0
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