Applied Mechanics and Graphic Statics
The forces which meet at one point and have their lines of action in different planes are called

Non-coplanar concurrent forces
Intersecting forces
Coplanar non-concurrent forces
Non-coplanar non-current forces

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
A couple can be never the balanced by a single force
Algebraic sum of forces, constituting a couple is zero
Algebraic sum of moments of forces, constituting a couple, about any point, is same

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Applied Mechanics and Graphic Statics
The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

Sum of the forces multiplied by the tangent θ°
Difference of the forces multiplied by cosine θ°
Arithmetical sum of the resolved parts of the forces in the direction
Algebraic sum of the resolved parts of the forces in the direction

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