Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

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 in motion
Friction force acting when the body is just about to move

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

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

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