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 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

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Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Zero potential energy and maximum kinetic energy
Maximum kinetic energy and maximum potential energy
Minimum kinetic energy and minimum potential energy
Zero kinetic energy and maximum potential energy

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