Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

Tend to compress each other till they are compressed maximum possible
Attempt to regain its original shape due to their elasticities
Immediately after collision come momentarily to rest
All listed here

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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 its base on a horizontal plane
A uniform solid cone resting on a generator on a smooth horizontal plane

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

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

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