<s>
In	O
the	O
field	O
of	O
engineering	O
mechanics	O
,	O
a	O
zero	B-Algorithm
force	I-Algorithm
member	I-Algorithm
is	O
a	O
member	O
(	O
a	O
single	O
truss	B-Device
segment	O
)	O
in	O
a	O
truss	B-Device
which	O
,	O
given	O
a	O
specific	O
load	O
,	O
is	O
at	O
rest	O
:	O
neither	O
in	O
tension	O
,	O
nor	O
in	O
compression	O
.	O
</s>
<s>
In	O
a	O
truss	B-Device
,	O
a	O
zero	B-Algorithm
force	I-Algorithm
member	I-Algorithm
is	O
often	O
found	O
at	O
pins	O
(	O
any	O
connections	O
within	O
the	O
truss	B-Device
)	O
where	O
no	O
external	O
load	O
is	O
applied	O
,	O
and	O
three	O
or	O
fewer	O
truss	B-Device
members	O
meet	O
.	O
</s>
<s>
Identification	O
of	O
basic	O
zero	B-Algorithm
force	I-Algorithm
members	I-Algorithm
can	O
be	O
accomplished	O
by	O
analyzing	O
the	O
forces	O
acting	O
on	O
an	O
individual	O
pin	O
in	O
a	O
physical	O
system	O
.	O
</s>
<s>
If	O
the	O
pin	O
has	O
an	O
external	O
force	O
or	O
moment	O
applied	O
to	O
it	O
,	O
then	O
all	O
of	O
the	O
members	O
attached	O
to	O
that	O
pin	O
are	O
not	O
zero	B-Algorithm
force	I-Algorithm
members	I-Algorithm
unless	O
the	O
external	O
force	O
acts	O
in	O
a	O
manner	O
that	O
fulfills	O
one	O
of	O
the	O
rules	O
below	O
:	O
</s>
<s>
It	O
is	O
a	O
common	O
practice	O
to	O
eliminate	O
zero	B-Algorithm
force	I-Algorithm
members	I-Algorithm
from	O
a	O
truss	B-Device
,	O
to	O
simplify	O
analysis	O
.	O
</s>
<s>
Although	O
an	O
absolute	O
minimalist	O
design	O
might	O
eliminate	O
all	O
zero	O
force	O
elements	O
from	O
a	O
truss	B-Device
,	O
there	O
are	O
still	O
sound	O
reasons	O
to	O
retain	O
some	O
of	O
these	O
components	O
in	O
actual	O
built	O
systems	O
:	O
</s>
