Applied Mechanics and Graphic Statics
The forces which meet at one point and have their lines of action in different planes are called

Non-coplanar concurrent forces
Non-coplanar non-current forces
Coplanar non-concurrent forces
Intersecting forces

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on its base on a horizontal plane
A solid cube resting on one edge
A uniform solid cone resting on a generator on a smooth horizontal plane
A satellite encircling the earth

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