Resultant force
The total physical force exerted by a force system is single force make same effect as the system.
Parallelogram Law of adding 2 forces
When two forces are geometrically represented by two adjacent sides in parallelogram in terms of magnitude and direction, the sum of the two forces is obtained by the magnitude and direction of the diagonal of the parallelogram along the vertice where the two forces meet.
Let magnitude be the angle P with each of the magnitudes P and Q, the magnitude R of the sum of the two oblique vectors, and the angle a formed with the force P, the magnitude of the symmetry.
Draw the CL perpendicular to the extended AB base
From the ACL triangle
AC² = AL² + LC²
R² = (P + Q cosθ )²+(Qsinθ)²
R²=P²+2PQcosθ+Q²cos²θ+Q²sinθ
R²=P²+2PQcosθ+Q²(cosθ²+sinθ²)
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