, , , . . . : . . .
.
- .
0(F) = r*F
M0(F) (r,F)
| M0(F) | = r*Fsin(r,F) = F*h (h - ) ( - ( ) )
L0 - .
: , L0 = $M0(F)
: L0 = $M0(F) = $(r * F) = r * $F = r * (R*) = M0(R*)
M0(R*) = $M0(F)
( - , )
:
- - .
.
- .
| M0(F) | = 2*SΔOAB
(M0o(F))z = 2*SΔOA'B'
S?OA'B' = SΔOAB*cosα
M0(F) = F*h - .
, , .
.
(M0'(F))z = (M0(F))z
: .
Z: M0z(F) = h * F
: = 0.
) F = 0
) h = 0 ( )
= 0, .
( ).
| i j k |
M0(F) = r * F = | x y z | = (y*Fz - z*Fy)*i + (z*Fx - x*Fz)*j + (x*Fy - y*Fx)*k = Mox(F)*i + Moy(F)*j + Moz(F)*k
| Fx Fy Fz |
Mox(F)=y*Fz - z*Fy
Moy(F)=z*Fx - x*Fz
Moz(F)=x*Fy - y*Fx
, .
2*S(OA'B') = 2*S(OAB)*cosα
| Moz(F) | = | Mo(F) |*cosα
MCOO =