Applied Mechanics and Graphic Statics
The member forces in a statically in determinate truss

Can be obtained by graphic statics
May be obtained by graphic statics
Can be obtained by graphic statics by trial and error
Cannot be obtained by graphic statics

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Angle between normal reaction and resultant of normal reaction and limiting friction
Friction force acting when the body is in motion
Friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction

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