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
Unlike parallel forces
Coplanar non-concurrent forces

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Engineering Mechanics
The static friction

All of these
Is independent of the area of contact, between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
Bears a constant ratio to the normal reaction between the two surfaces

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