<s>
Dynamical	B-Algorithm
simulation	I-Algorithm
,	O
in	O
computational	B-Algorithm
physics	I-Algorithm
,	O
is	O
the	O
simulation	O
of	O
systems	O
of	O
objects	O
that	O
are	O
free	O
to	O
move	O
,	O
usually	O
in	O
three	O
dimensions	O
according	O
to	O
Newton	O
's	O
laws	O
of	O
dynamics	O
,	O
or	O
approximations	O
thereof	O
.	O
</s>
<s>
Dynamical	B-Algorithm
simulation	I-Algorithm
is	O
used	O
in	O
computer	O
animation	O
to	O
assist	O
animators	O
to	O
produce	O
realistic	O
motion	O
,	O
in	O
industrial	O
design	O
(	O
for	O
example	O
to	O
simulate	O
crashes	O
as	O
an	O
early	O
step	O
in	O
crash	O
testing	O
)	O
,	O
and	O
in	O
video	O
games	O
.	O
</s>
<s>
Body	O
movement	O
is	O
calculated	O
using	O
time	B-Algorithm
integration	I-Algorithm
methods	I-Algorithm
.	O
</s>
<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
program	O
called	O
a	O
physics	O
engine	O
is	O
used	O
to	O
model	O
the	O
behaviors	O
of	O
objects	O
in	O
space	O
.	O
</s>
<s>
They	O
are	O
also	O
used	O
to	O
create	O
Dynamical	B-Algorithm
simulations	I-Algorithm
without	O
having	O
to	O
know	O
anything	O
about	O
physics	O
.	O
</s>
<s>
They	O
are	O
generally	O
broken	O
into	O
real-time	B-General_Concept
and	O
the	O
high	O
precision	O
,	O
but	O
these	O
are	O
not	O
the	O
only	O
options	O
.	O
</s>
<s>
Most	O
real-time	B-General_Concept
physics	O
engines	O
are	O
inaccurate	O
and	O
yield	O
only	O
the	O
barest	O
approximation	O
of	O
the	O
real	O
world	O
,	O
whereas	O
most	O
high-precision	O
engines	O
are	O
far	O
too	O
slow	O
for	O
use	O
in	O
everyday	O
applications	O
.	O
</s>
<s>
The	O
models	O
used	O
in	O
Dynamical	B-Algorithm
simulations	I-Algorithm
determine	O
how	O
accurate	O
these	O
simulations	O
are	O
.	O
</s>
<s>
This	O
is	O
a	O
simple	O
model	O
but	O
it	O
is	O
accurate	O
enough	O
to	O
produce	O
realistic	O
output	O
in	O
real-time	B-General_Concept
Dynamical	B-Algorithm
simulations	I-Algorithm
.	O
</s>
