Notes, problems, apps and sets related to this problem, the closest match first.
A Force in the Second Quadrant

Coplanar Force Resultant: Table, Polygon and Missing Force
Add any number of forces in a plane with a clear component table and a force polygon, or find the force that is missing, that balances the others or that turns the resultant to a wanted direction.

Dot Product Visualizer: Angles and Projections in 3D
See what the dot product means: the angle between two directions and the part of a force along a line, drawn in 3D with its perpendicular part and a right-angle mark.

3D Force Vector Builder: Angles, Two Points and Sums
Build a force in space from its components, its three direction angles, two angles or two points, turn the 3D view with the mouse, and add several forces into one.

Adding Forces: Parallelogram Law and Triangle Rule
Find the resultant of two or more forces with the parallelogram law, the triangle rule and the laws of sines and cosines.















