Write lamis theorem and verify it in the laboratory.
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Lami's theorem states that, if three concurrent forces act on a body keeping it in Equilibrium, then each force is proportional to the sine of the angle between the other two forces.
Let P, Q, R be the 3 concurrent forces in equilibrium as shown in fig. (a)
Since the forces are vectors, we can move them to form a triangle as shown in fig. (b)
Applying sine rule we get
P/(sin(180−α))=Q/(sin(180−β))=R/(sin(180−θ))P/(sinα)=Q/(sinβ)=R/(sinθ)...... Hence Proved
Let P, Q, R be the 3 concurrent forces in equilibrium as shown in fig. (a)
Since the forces are vectors, we can move them to form a triangle as shown in fig. (b)
Applying sine rule we get
P/(sin(180−α))=Q/(sin(180−β))=R/(sin(180−θ))P/(sinα)=Q/(sinβ)=R/(sinθ)...... Hence Proved
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