Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Like parallel forces
Coplanar concurrent forces
Coplanar non-concurrent forces
Unlike parallel forces

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

None of these
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
Do not meet at one point but their lines of action lie on the same plane

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