fizikis kursi

Soris. Δ r simciris gamo F Zala SeiZleba mudmivad CavTvaloT, xolo
Δ r → dr
.
elementaruli gzis sigrZe, romelsac gadis Zalis modebis
wertili dt drois SualedSi
maSin elementaruli muSaoba
ds =
35
d r
dA = Fds cosα
aq d simbolo aRniSnavs mcire sidideebs.
meqanikuri muSaoba _ skalaruli sididea, aditiuri. Tu:
• 90 ,
°
α < dA > 0,
muSaoba dadebiTia.
• 90 ,
°
α = dA = 0,
muSaoba tolia nulis.
• 90 ,
°
α > dA < 0,
muSaoba uaryofiTia.
n
n
n
⎛ ⎞
E dA = ∑ dAi
= ⎜∑
F i ⎟d
r i = ∑ F i v idt
,
i=
1 ⎝ i=
1 ⎠ i=
1
sadac r i da v i radius-veqtori da siCqarea Zalis modebis wertilSi.
materialuri wertilis moZraobis dros
sadac p - wertilis impulsia.
dA = vd
myari sxeulis gadatanis da moZraobis dros
dA c
p
= v d p
sadac p = mv
c - myari sxeulis impulsia, romlis masaTa centri
moZraobs v c siCqariT. m – myari sxeulis masaa.
cvladi Zalis muSaoba
davuSvaT, nawilakze (sxeulze) moqmedebs cvladi Zala, romlis
sidide damokidebulia koordinataze kanoniT Fr = F(r
) . aseTi Zalis
elementaruli muSaoba Δ Ai = FrΔr
i ricxobrivad toli iqneba naxazze
daStrixuli zolis farTis, xolo 1
r -dan 2
r gzaze is tolia farTis,