Verso l'alto:
W
1
=
-
(
F
p
x
+
F
a
)
⋅
L
=
-
m
g
(
s
i
n
α
+
μ
c
o
s
α
)
⋅
L
Verso il basso:
W
2
=
(
F
p
x
-
F
a
)
⋅
L
=
m
g
(
s
i
n
α
-
μ
c
o
s
α
)
⋅
L