Applied Mechanics and Graphic Statics
Which of the following represents the state of neutral equilibrium?

None of these
A smooth cylinder lying on a curved surface
A cube resting on one edge
A smooth cylinder lying on a convex surface

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Sum of resolved parts in any two directions at right angles, are both zero
Algebraic sum of the forces is zero
Algebraic sum of the moments of the forces about the point is zero
Two resolved parts in any two directions at right angles are equal

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Applied Mechanics and Graphic Statics
The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

Algebraic sum of the resolved parts of the forces in the direction
Arithmetical sum of the resolved parts of the forces in the direction
Difference of the forces multiplied by cosine θ°
Sum of the forces multiplied by the tangent θ°

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