Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Proportional to the distance from the point of reference and directed towards it
Proportional to the square of the distance from the point of reference
Always directed away from the centre, the point of reference
Inversely proportion to the distance from the point of reference

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Applied Mechanics and Graphic Statics
Varingon’s theorem of moment’s states

Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point

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