Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

constitute a moment of couple
constitute a couple
constitute a moment
balance each other

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces are parallel
these forces are equal

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Strength of Materials
According to Lami's theorem

Three forces acting at a point will be in equilibrium
Three forces acting at a point can be represented by a triangle, each side being proportional to force
If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

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