Engineering Mechanics
The friction experienced by a body, when at rest, is known as

Coefficient of friction
Limiting friction
Static friction
Dynamic friction

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of the vertical components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero
All of these

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Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero

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