Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Bears a constant ratio to their velocity of approach
Is directly proportional to their velocity of approach
Is equal to the sum of their velocities of approach
Is inversely proportional to their velocity of approach

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

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