Engineering Mechanics
The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

Coefficient of friction
Static friction
Limiting friction
Dynamic friction

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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 and their lines of action also 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, but their lines of action do not lie on the same plane

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