isolated joint with only body forces acting on it

isolated joint with internal forces acting on it

isolated joint with all the forces, internal as well as external, acting on it

none of the above

one force only

one couple only

one force and one couple only

none of the above

force polygon closes

funicular polygon closes

both force polygon and funicular polygon close

all the forces are concurrent

any copianar force system

a system of parallel forces only

concurrent copianar force system

non-concurrent copianar force system

triangle

open polygon

closed polygon

parallelogram