, , s = s(t).
v a Oxyz, P nb, (..). , , :
- P s;
- Pn , ;
- Pb P Pn , ( Pb P Pn ).
Pn, ( , ), , Pb - .
v , s :
= ds / dt = .
, , , ( ) .
v = | | , , v :
v = , s,
v = - , .
, , , v .
a P n an (ab = 0):
- :
= d / dt = d2s /dt2 = = .
- , :
an = v2 / .
an .
a , P , a n, Pn:
a = + a n.
, P , a n , an 0.
, a :
|
|
a = ( 2 + an2) .
, .
- , . , , k = 1 / .
, : = R ( k = 1 / R); = ( k = 0).
, .
- , = d / dt = 0.
, v = | | = const, .
, , . - , an = v2 / = 0.
, = , . = , , .
, v = 0, .
()
, , ,
- ;
- .