Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

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

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Remain horizontal
Slant up towards direction of pull
Slant down towards direction of pull
None of these

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

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

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