. : , , , . (, ), (, ). , , ( ) , , .
, .
, .
F, , Fs (Fs = Fcosa), :
A = Fss = Fs cosa. (11.1)
, , (11.1) . , , dr, F ,
. F d r
d = F d r = F cosa ds=Fsds,
F d r; ds = |d r | ; Fs F d r (. 13).
1 2 .
Fs s 1 2. (. 14), . , , , F=const a=const,
s (. (11.1)).
(11.1) , a<p/2 , F s
v (. . 13). a>p/2, . a = p/2 ( ) .
(): 1 , 1 1 (1 = 1 ͕).
, :
N=da/dt. (11.3)
dt F F d r, , ,
N= F d r /dt= Fv
. . , ; N .
(): 1 , 1 1 (1 = 1 /).
|
|
.
F, , , . , dA F , 0 v, dT , . .
dA= dT.
F =md v /dt
d r,
F d r =m(d v /dt)dr=dA
, , v,
= v2/2. (12.1)
(12.1) , , . . .
(12.1) , , . , , , , . , .