Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on its base on a horizontal plane
A solid cube resting on one edge
A uniform solid cone resting on a generator on a smooth horizontal plane
A satellite encircling the earth

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

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

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