Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
All of these
The force of friction always acts in a direction opposite to that in which a body is moving

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

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
A satellite encircling the earth

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