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

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

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