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June 2018 p41 q2
3631
The diagram shows three coplanar forces acting at the point O. The magnitudes of the forces are 6 N, 8 N, and 10 N. The angle between the 6 N force and the 8 N force is 90°. The forces are in equilibrium. Find the other angles between the forces.
Solution
Since the forces are in equilibrium, we can use the cosine rule and Lami's theorem to find the angles between the forces.
Using the cosine rule for the triangle formed by the forces: