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2. We apply Newton’s second law (Eq. 51 or, equivalently, Eq. 52). The net force
applied on the chopping block is
G
G
G
FF
F
net
=+
12
, where the vector addition is done using
unitvector notation. The acceleration of the block is given by
G
G
G
aFFm
di
/.
(a) In the first case
()
(
)
(
)
ˆˆ
ˆ
ˆ
3.0N i
4.0N j
3.0N i
4.0N j
0
ªº
ª
º
+=
+
+−
+
−
=
¬¼
¬
¼
GG
so
G
a
=
0
.
(b) In the second case, the acceleration
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 Spring '08
 Any
 Physics, Acceleration, Force

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