Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Magnitude of the force
Line of action of the force
Nature of the force i.e. whether the force is push or pull
All of these

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Engineering Mechanics
Coplanar concurrent forces are those forces which

Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane

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