Muenzaniso wemibvunzo yeImpulse

Mienzaniso mina yeMibvunzo yeKufungidzira

1. Bhora rine huremu hwe 0,5 kg rinodonha zvakasununguka kubva pakukwirira kwe h ₁ = 7,2 m pamusoro pepasi uye rinosvetuka kusvika pakukwirira kwe h ₂ = 3,2 m. Kana kukurumidza kunokonzerwa negiravhiti kuri 10 ms ^-2 , kupindira kunoshanda pabhora ndiko...

A. 2,0 Ns

B. 3,0 Ns

C. 10 Ns

D. 40 Ns

E. 80 Ns

Kukurukurirana

Zvinozivikanwa kuti :

Huremu hwebhora (m) = 0,5 kg

Kureba kwebhora rinodonha rakasununguka (h ₁ ) = 7,2 metres

Kureba kwebhora rinosvetuka (h ₂ ) = 3,2 metres

Kumhanya kwesimba repasi (g) = 10 m/s ²

Akabvunzwa : Kufungidzira kuri kuita bhora

Mhinduro :

Kumhanya kwebhora nguva pfupi isati yarova (v)_o)

Verenga kumhanya kwebhora usati warova uchishandisa fomura yekudonha yakasununguka. Zvichienderana nekukwirira (h) = 7,2 metres, kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s ² uye kumhanya kwekupedzisira usati warova pasi, shandisa fomura v ² = 2 gh

vo _o ² = 2(10)(7,2) = 144

v _o = 2(10)(7,2) = 12 m/s

Kumhanya kwebhora risati rarova (vo ₎ i -12 m/s. Chiratidzo chekuramba chiripo chinongoratidza gwara.

Kumhanya kwebhora mushure mekuroverana (v)_t)

Verenga kumhanya kwebhora mushure mekurovera uchishandisa fomura yekufamba wakamira kumusoro. Zvichienderana nekukwirira (h) = 3,2 metres, kukurumidza kwegiravhiti (g) = -10 m/s ² , kumhanya kwekupedzisira pakukwirira kwakanyanya (v _t ² ) = 0 uye kumhanya kwekutanga mushure mekurovera pasi kunokumbirwa, saka shandisa fomura v _t ² = v _o ² + 2 gh

v _t ² = v _o ² + 2 gh

0 = vo ₂ ⁺ 2 (-10)(3,2)

vho ₂ = ⁶⁴

v _o = √64 = 8 m/s

Kumhanya kwebhora mushure mekuroverana (v _t ) i8 m/s

Kufungidzira kuri kuita bhora (I)

Impulse inoverengwa uchishandisa fomura ye impulse-momentum theorem.

Kukurumidza (I) = kuchinja kwesimba (Δp)

I = m (v _t – vo _o ) = (0,5)(8-(-12)) = (0,5)(8 + 12) = 0,5(20) = 10 Masekondi eNewton

Mhinduro chaiyo ndiC.

2. Bhora reping pong rine huremu hwemagiramu mashanu rinodonha zvakasununguka kubva pahurefu hwakati (g = 10 ms ^-2 ). Kana rikarova pasi, kumhanya kwebhora kuri 6 ms ^-1 uye pakarepo mushure mekurova pasi, bhora rinosvetuka kumusoro nekukurumidza kwe4 ms ^-1 . Hukuru hwesimba rinoita pabhora ndehwekuti...

A. 0,50 Ns

B. 0,25 Ns

C. 0,10 Ns

D. 0,05 Ns

E. 0,01 Ns

Kukurukurirana

Zvinozivikanwa kuti :

Huremu hwebhora (m) = magiramu mashanu = 0,005 kg

Kumhanya kwebhora nguva pfupi isati yasvika pasi (vo ₎ = -6 m/s

Kumhanya kwebhora mushure mekurova pasi (v _t ) = 4 m/s

Kumhanya kwakanaka uye kusina kunaka zvinoreva kuti bhora rakananga kumhanya kwaro kana kuti bhora rakananga kufamba kwaro risati rasangana kunopesana nekwakananga kufamba kwaro mushure mekusangana.

Akabvunzwa : Kufungidzira (I)

Mhinduro :

Dzidziso ye "impulse-momentum theorem" inotaura kuti "impulse" (I) yakaenzana nekuchinja kwe "momentum" (Δp).

I = Δp = mv _t – mv _o = m (v _t – v _o )

Ini = (0,005)(4 – (-6)) = (0,005)(4 + 6) = (0,005)(10) = 0,05 Newton second

Mhinduro chaiyo ndiD.

3. Bhora remagiramu makumi maviri rinokandwa nevelocity v ₁ = 4 ms ^-1 kuruboshwe. Mushure mekurova madziro, bhora rinosvetuka nevelocity v ₂ = 2 ms ^-1 kurudyi. Kukurudzira kunobuda ndekwekuti….

A. 0,24 Ns

B. 0,12 Ns

C. 0,08 Ns

D. 0,06 Ns

E. 0,04 Ns

Kukurukurirana

Zvinozivikanwa kuti:

Huremu hwebhora (m) = magiramu mashanu = 0,020 kg

Kumhanya kwebhora risati rasangana (vo _o ) = -4 m/s (kuruboshwe)

Kumhanya kwebhora mushure mekuroverana (v _t ) = +2 m/s (kurudyi)

v _o inopiwa chiratidzo chekuramba kuti isiyanise divi rayo kubva pav _t.

Akabvunzwa: Kuvhunduka

Mhinduro:

Kuvhunduka (I) = kuchinja kwesimba (Δp) = mv _t – mv _o

Kufungidzira (I) = m (v _t – vo _o ) = 0,02 (2 – (-4))

Kufungidzira (I) = 0,02 (2 + 4) = 0,02 (6)

Kufungidzira (I) = 0,12 masekondi eNewton.

Mhinduro chaiyo ndeiyi B.

4. Bhora retenesi remagiramu zana rinodonhedzwa pasi kubva pakukwirira kwe20 cm pasina kumhanya kwekutanga. Mushure mekurovera pasi, bhora rinosvetuka nekukurumidza kwe1 ms ^-1 uye (g = 10 ms ^-2 ). Kuchinja kwesimba rinoonekwa nebhora...

A. 0,1 Ns
B. 0,3 Ns
C. 0,5 Ns
D. 0,8 Ns
E. 0,9 Ns

Kukurukurirana
Zvinozivikanwa :
Huremu hwebhora (m) = magiramu mashanu = 0,1 kg
Kureba (h) = 20 cm = 0,2 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s²
Kumhanya kwebhora mushure mekunge rarova pasi (v)_t) = 1 m/s
Akabvunzwa : kuchinja kwesimba rebhora
Jawab :
Kumhanya kwebhora risati rarova (v)_o)
Verenga kumhanya kwebhora usati warova uchishandisa fomura yekudonha kwemahara. Zvichienderana nekukwirira kwekudonha kwebhora kwemahara (h) = 0,2 metres, kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s² uye ndakabvunza kumhanya kwebhora kana rarova pasi, saka fomura yacho inoshandiswa v² = 2 gh
v² = 2 (10)(0,2) = 4
v= √4 = -2 m/s
Inopiwa chiratidzo chekusateerera nekuti bhora richifamba risati rasangana nepasi rinopesana nekwarakananga bhora richifamba mushure mekusangana nepasi.
Kuchinja kwesimba rebhora (Δp)
Δp = mv_t - mv_o = m (v)_t - v_o)
Δp = (0,1)(1 – (-2)) = (0,1)(1 + 2) = (0,1)(3) = 0,3 Newton Second
Mhinduro chaiyo ndeiyi B.

Kwakabva mubvunzo:

Mibvunzo yeNational Examination Physics yeChikoro Chesekondari/Chikoro Chepamusoro Chebasa