Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

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

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Friction force acting when the body is in motion
Ratio of limiting friction and normal reaction
Friction force acting when the body is just about to move
Angle between normal reaction and resultant of normal reaction and limiting friction

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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
Inversely proportion to the distance from the point of reference
Proportional to the square of the distance from the point of reference
Proportional to the distance from the point of reference and directed towards it

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