Strength of Materials
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of

forces
independence of forces
balance of force
resolution of forces.

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Strength of Materials
Coefficient of friction is the

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

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Strength of Materials
Limiting force of friction is the

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

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