Applied Mechanics and Graphic Statics
The angle of friction is:

The force of friction at which the body is just about to move
The angle between the normal reaction and the resultant of normal reaction and limiting friction
The ratio of the friction and the normal reaction
The force of friction when the body is in motion

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Applied Mechanics and Graphic Statics
Varingon’s theorem of moment’s states

Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

None of these
a rectilinear motion with constant speed
a damped oscillatory motion
a simple harmonic motion

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