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U R
U
t
t ∈ U ~a(t)
U
t
0
∈ R
t
0
∈ R t
0
~a(t)
~
b(t) ~r(t)
~
i,
~
j,
~
k
~
i,
~
j
~a(t)
~a(t) = a
x
(t)
~
i + a
y
(t)
~
j + a
z
(t)
~
k ~a(t) = a
x
(t)
~
i + a
y
(t)
~
j ),
a
x
(t), a
y
(t), a
z
(t) a
x
(t), a
y
(t) ~a(t)
~
i,
~
j,
~
k
~
i,
~
j
~a(t)
~a(t)
t
0
t
0
~a ~a(t) t
0
lim
t→t
0
|~a(t) − ~a| 0 ~a(t)
~a = lim
t→t
0
~a(t)
