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

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

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

At any point on the surface normal to the line of action of the force
At the centre of gravity of the body
On any point on the line of action of the force
On the periphery of the body

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