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

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

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Engineering Mechanics
Angle of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction
The ratio of minimum friction force to the friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
The ratio of minimum friction force to friction force acting when the body is in motion

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