one safely tools combined work easily simple small force large quickly two reduce work complex
Machines
help
us
do
more
,
,
and
/
or
.
Machines
the
amount
of
required
to
do
but
often
require
working
over
a
greater
distance
.
The
most
basic
machines
are
called
machines
.
Simple
machines
have
or
parts
.
Simple
machines
are
called
.
Simple
machines
can
be
to
create
machines
.
Complex
machines
can
be
as
as
a
mechanical
watch
or
as
as
a
construction
crane
.