Applied Mechanics and Graphic Statics
A cylinder will slip on an inclined plane of inclination 0 if the coefficient of static friction between plane and cylinder is

less than (2/3) sin 6
less than (2/3) tan 0
less than (1/3) sin 6
less than (1/3) tan 0

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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
Immediately after collision come momentarily to rest
Attempt to regain its original shape due to their elasticities
All listed here

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