What do we mean by the force system?
When two or more forces act on a body, they are called a force system.
Coplanar forces: The forces whose line of action lie on the same plane are known as coplanar forces.
Concurrent forces: The forces which meet at one point are known as concurrent forces.
Collinear forces: The forces whose line of action lie on the same line are known as collinear forces.
Coplanar concurrent forces: The forces whose line of action lie on the same plane and which meet at one point also are known as coplanar concurrent forces.
Coplanar non-concurrent forces: The forces whose line of action lie on the same plane but does not meet at one point are known as coplanar non-concurrent forces.
Non-coplanar concurrent forces: The forces whose line of action does not lie on the same plane but meet at one point are known as non-coplanar concurrent forces.
Non-coplanar non-concurrent forces: The forces whose line of action does not lie on the same plane and does not meet at one point also are known as non-coplanar non-concurrent forces.
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