Lami theorem applies to three concurrent coplanar forces in equilibrium and states that each force is proportional to the:
Choose the correct answer
Sine of the angle opposite to it (sine of the angle between the other two forces)
Sum of the other two forces
Cosine of the angle between itself and one other force
Algebraic sum of components
Correct Answer
A. Sine of the angle opposite to it (sine of the angle between the other two forces)
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Lami's theorem: for three concurrent forces F1, F2, F3 in equilibrium: F1/sin(alpha) = F2/sin(beta) = F3/sin(gamma), where alpha = angle between F2 and F3 (opposite to F1), beta = angle between F1 and F3, gamma = angle between F1 and F2. Useful for finding unknown forces when all three are concurrent and two angles are known.
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