A
class
1
lever
with
a
fulcrum
in
the
centre
needs
the
____________________
effort
to
move
the
load
,
foe
example
,
a
____________________
-
____________________
.
A
class
2
lever
needs
____________________
effort
to
move
the
load
,
for
example
a
____________________
.
A
class
3
lever
needs
____________________
effort
to
move
the
load
,
for
example
____________________
.
