Lever
is
a
____________________
machine
.
It
consists
of
a
long
____________________
that
moves
____________________
objects
by
pushing
or
____________________
against
a
____________________
point
or
____________________
.
Different
classes
of
levers
have
different
fulcrum
____________________
.
For
example
,
a
boat
oar
is
a
____________________
-
class
lever
,
a
____________________
is
a
____________________
-
class
lever
and
your
arm
works
as
a
____________________
-
class
lever
.
