Applied Mechanics and Graphic Statics
A cube on a smooth horizontal surface

Cannot be in stable equilibrium
Can be in any of these states
Cannot be in neutral equilibrium
Cannot be in unstable equilibrium

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

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

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

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