.. - - ..
, . .
K0 = M0(mv)= r ×mv
. .
1) , - , .
d(M0(mv))/dt = M0(F)
2) , - .
dKz/dt = Mz(F)
6. : , .
-
dA = F*dS*cos y
y = 0, dA = F*dS
y = 90*, dA = 0
y = 180*, dA = -F*dS
dA = Fxdx + Fydy + Fzdz
, , .
P = dA/dt
:
dA = M*dϕ
P = M*ω
.. . .
, .
:
1) . ,
dT = dA
2) , .
dT/dt = P
3) . .
mv2/2 mv02/2 = A
. . .
. - , . , . , . , .
Fx = ∂U/∂x Fy = ∂U/∂y Fz = ∂U/∂z
U(x;y;z) F = grad (U)
. . :
1) . - . dA = Fxdx + Fydy+ Fzdz = dU
2) . . , .
A = U(M) U(M0)
.
, . . , :
. . , , . .
= 0 =
() = - U(M) + const
.: E = T + = 0 + 0 =const