Classification of force system:
1. Coplanar force system
All force acting in one plane.
2. Non-coplanar force system
All force are not lie on the same plane.
Collinear coplanar force system
Line of action of force is in same line.
Concurrent force system
All force meet at one point.
Concurrent forces may or may not be collinear.
Coplanar concurrent force system
All force lies in the same plane and are acting through the same point.
Coplanar non-concurrent force system
All force lie in one plane but not meet at one point.
Coplanar parallel force system
All force lie in one plane and they are parallel to each other.
Coplanar non-concurrent and non-parallel force system
All force lie in one plane.
All force are not meet at one point and also not parallel to each other.
Non-Coplanar and concurrent force system
All force lie on different plane but pass through a single point.
Non-coplanar and non-concurrent force system
All force lie on different plane and not pass through a single point.