x net
x
x
F
F
ma
=
=
∑
net
F
F
ma
=
=
∑
G
G
G
Because
is a vector equation it can be resolved
into 3 equations, one for each coordinate axis.
y net
y
y
F
F
ma
=
=
∑
z net
z
z
F
F
ma
=
=
∑
x:
y:
z:
1
F
G
2
F
G
v
G
Note that
says nothing about
any constant velocity the object might have.
net
F
F
ma
=
=
∑
G
G
G
net
F
0
=
G
says that the acceleration of the object
is zero, but implies nothing about its velocity.
Each is true independent of
what happens along the other
coordinate directions.
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