Strength of Materials
A number of forces acting at a point will be in equilibrium if

All of them are inclined equally
Two resolved parts in two directions at right angles are equal
Sum of resolved parts in any two perpendicular directions are both zero
Their total sum is zero

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
Minimum when it acts at the C.G. of the body
The same at every point in its line of action

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