-masala. M assasi 10 kg b o ‘lgan jism o ‘zgarm as F

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Yechish.

51-masala. M assasi 10 kg b o ‘lgan jism
o ‘zgarm as F kuch t a ’sirida gorizo n tal te-
kislikda Ax o ‘q b o ‘y!ab harakatlanadi (158-
rasm ). F k uch n in g Ax bilan hosil qilgan
b urchagi a=30°. A jism tezligini 5 sekund-
da 2 m /s dan 4 m /s g a c h a o ‘zgartiru v chi
F k uch a n iq la n sin . Ish q a la n ish k o e ffit
siyenti / = 0,15.
Yechish. Sanoq sistem asini 158-rasm -
dagidek tanlaym iz. A jism ni m oddiy nu q ta
deb qaraym iz. U nga og‘irlik kuchi G , gorizontal tekislikning no rm al
reaksiyasi N , ish q a la n ish k u ch i ^ish h a m d a o ‘z g a rm as F ku ch
t a ’sir qiladi.
M asala shartiga ko ‘ra:
^ = 0 da V0x = 2 m /s , V0y = 0 ,
(84.1)
/ = 5 s d a Vx = 4 m /s .
(84.2)
A jism g a ta ’sir qiluvchi k u c h la r im pulslari yig‘in d isin in g Ax va
Ay o ‘qlardagi proyeksiyalari (81.3) ga asosan q uyidagicha b o ‘ladi:
N.
'
ish
//////,
777777777777"
’G
158-rasm.
155

5
5
Sx = $( F c o s a - Fish)d t, Sy = j ( N + / ’s in a - G ) d t .
(84.3)
о
о
7^sh = f N b o ‘lg an i u c h u n (85.3) te n g la m a quyidagi k o ‘rin ish n i
oladi:
5
5
Sx = j ^ F c o s a - f N ) d t , Sy = J(yV + / ’s in a - G ) d t . (84.4)
о
о
M od d iy n u q tan in g harak at m iq do rining o ‘zgarishi haqidagi te o
rem an i (82.10) k o ‘rinishda yozamiz:
m Vx - m V0x = S x,

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