Applied Mechanics and Graphic Statics
Periodic time of body moving with simple harmonic motion, is

Directly proportional to its angular velocity
Directly proportional to the square of its angular velocity
Inversely proportional to its angular velocity
Inversely proportional to the square of its angular velocity

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Applied Mechanics and Graphic Statics
The angle of friction is:

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

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