Mafunso a Chitsanzo cha Malamulo a Newton

Zitsanzo 20 za Malamulo a Newton

Lamulo Loyamba la Newton

1. Ngati mphamvu yochokera pa chinthu ndi yofanana ndi zero, ndiye kuti...

(1) chinthucho sichidzafulumira

(2) zinthu nthawi zonse zimakhala pamtendere

(3) kusintha kwa liwiro la chinthucho ndi zero

(4) n'zosatheka kuti chinthu chiyende molunjika pa liwiro losasintha

Chowonadi ndi chakuti ...

A. (1), (2) ndi (3)

B. (1) ndi (3) zokha

C. (2) ndi (4) zokha

D. (4) yokha

E. (1), (2), (3) ndi (4)

Zokambirana

Yankho lolondola ndi ili:

(1) Chinthucho sichidzafulumira

Mphamvu yochokerapo imapangitsa chinthu kufulumira. Ngati mphamvu yochokerapo ndi zero, chinthucho sichidzafulumira.

(2) Zinthu zimakhala pa mpumulo nthawi zonse

Lamulo Loyamba la Newton limati ngati mphamvu yochokera pa chinthu ndi zero, ndiye kuti chinthu chomwe chili pampando chidzakhalabe pampando ndipo chinthu chomwe chikuyenda pa liwiro losasintha (kuyenda kofanana kwa mzere) chidzakhalabe pa liwiro losasintha.

(3) Kusintha kwa liwiro la chinthucho ndi zero

Kusintha kwa liwiro = kuthamanga. Kusintha kwa liwiro la chinthu ndi zero, kutanthauza kuti kuthamanga kwa chinthucho ndi zero. Ngati kuthamanga kuli zero, ndiye kuti mphamvu yomwe imagwira ntchito pa chinthucho ndi zero.

Yankho lolondola ndi A.

Zinthu mu Elevator

2. Sandi akakhala mu elevator yosasuntha, kulemera kwake ndi 500 N. Kuthamanga chifukwa cha mphamvu yokoka = 10 ms ^–2 . Elevator ikathamanga, mphamvu ya chingwe imakhala 750 N. Chifukwa chake, kuthamanga kwa elevator ndi…

A. 5,0 ms ^–2

B. 7,5 ms ^–2

C. 10,0 ms ^–2

D. 12,5 ms ^–2

E. 15,0 ms ^–2

Zokambirana

Amadziwika kuti:

Kulemera kwa code (w) = 500 Newton = 500 kg ms ^–2 (lifti ili pamalo opumulira)

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 ms ^–2

Kulemera kwa Mawu Achinsinsi (m) = 500 / 10 = 50 kg

Kukakamira kwa chingwe (T) = 750 N (chikepe chothamanga)

Kulemera kwa lift sikunatchulidwe.

Anafunsa: Kuthamanga kwa elevator

Yankho:

Chikepe chili pamalo opumulira, palibe kuthamanga (a = 0). Mphamvu yokwera ndi yabwino, mphamvu yotsika ndi yoipa.

ΣF = ma

T – w = 0

T = w

T = 500 Newtons

Ngati chokweza chikuyenda mofulumira pansi, mphamvu ya kukakamiza mu chingwe imakhala yochepera ma Newton 500. Kumbali ina, ngati chokweza chikuyenda mofulumira mmwamba, mphamvu ya kukakamiza mu chingwe imakhala yoposa ma Newton 500.

Kukakamira kwa chingwe kumakhala 750 N, zomwe zimapangitsa kuti elevator ipite patsogolo mofulumira. Mphamvu zomwe zili mbali imodzi ndi kayendetsedwe ka elevator zimakhala zabwino, ndipo mphamvu zomwe zili mbali inayo zimakhala zoipa.

T – w = ma

750 – 500 = 50 a

250 = 50 a

a = 250 / 50

a = 5,0 ms ^–2

Yankho lolondola ndi A.

3. Munthu wolemera makilogalamu 60 ali mu elevator yomwe ikuyenda pansi ndi kuthamanga kwa 3 ms ^-2 . Ngati kuthamanga chifukwa cha mphamvu yokoka ndi 10 ms ^-2 , ndiye kuti mphamvu yachibadwa yomwe pansi pa elevator imaperekedwa pa munthuyo ndi...

A. 180 N

B. 200 N

C. 340 N

D. 420 N

E. 600 N

Zokambirana

Amadziwika kuti:

Kulemera (m) = 60 kg

Kuthamanga kwa munthu ndi elevator (a) = 3 m/s ²

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Mphamvu yokoka (w) = mg = (60)(10) = 600 Newtons

Anafunsa: mphamvu yachibadwa (N)

Yankho:

Pali mphamvu ziwiri zomwe zimagwira ntchito pa munthu yemwe ali mu elevator, zomwe ndi mphamvu yokoka (w) ndi mphamvu yachibadwa yomwe pansi pa elevator pa munthuyo (N). Pali kuchuluka kwa ma vector atatu, komwe ndi mphamvu yokoka, mphamvu yachibadwa, ndi kufulumizitsa elevator, komwe mphamvu yokoka imatsogozedwa pansi, mphamvu yachibadwa imatsogozedwa mmwamba, ndipo kufulumizitsa elevator kumatsogozedwa pansi. Kuchuluka kwa vector yolunjika pansi kumasankhidwa kukhala ndi chizindikiro chabwino ndipo kuchuluka kwa vector yolunjika mmwamba kumasankhidwa kukhala ndi chizindikiro choipa.

∑ F = ma

w – N = (60)(3)

600 – N = 180

N = 600 - 180

N = 420 Newton

Yankho lolondola ndi D.

4. Reza, wolemera makilogalamu 40, ali mu elevator yomwe ikukwera mmwamba. Ngati mphamvu ya pansi pa elevator pamapazi a Reza ndi 520 N ndipo kuthamanga chifukwa cha mphamvu yokoka ndi 10 ms ^-2 , ndiye kuti kuthamanga kwa elevator ndi...

A. 1,0 ms ^-2

B. 1,5 ms ^-2

C. 2,0 ms ^-2

D. 2,5 ms ^-2

E. 3,0 ms ^-2

Zokambirana

Amadziwika kuti:

Kulemera (m) = 40 kg

Mphamvu yachibadwa (N) = 520 N

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Mphamvu yokoka (w) = mg = (40)(10) = 400 N

Anafunsa: Kuthamanga kwa elevator

Yankho:

∑ F = ma

400 – 520 = (40)(a)

-120 = (40)(a)

a = -120/40

a = -3 m/s ²

Kuthamanga kwa elevator ndi 3 m/s ^2. Chizindikiro chotsutsa chimatanthauza kuti elevator ikukwera mmwamba.

Yankho lolondola ndi E.

5. Munthu wolemera makilogalamu 60 ali mu lifti yomwe ikuyenda pansi ndi kuthamanga kwa 3 ms ^-2 . Kodi mapazi a anthu ali ndi mphamvu yotani pansi pa lifti?

Zokambirana

Amadziwika kuti:

Kulemera kwa munthu (m) = 60 kg

Kulemera kwa munthu (w) = mg = (60 kg)(10 m/s ² ) = 600 kg m/s ² = 600 Newtons

Kuthamanga kwa elevator (a) = 3 m/s ² , pansi.

Funso: Kodi mapazi a munthu amapanikizika bwanji pansi pa elevator?

Yankho:

Chikepe chimapita pansi ndi liwiro la (a) la 3 m/s ^2. Mphamvu yomwe ili mbali imodzi ndi kayendedwe ka chikepe ndi yabwino, mphamvu yomwe ili mbali inayo ndi kayendedwe ka chikepe ndi yoipa.

w – N = ma

N = w – ma

N = 600 – (60)(3)

N = 600 - 180

N = 420 Newton

Iyi ndi mphamvu yachibadwa imene pansi pa elevator imagwiritsa ntchito pa munthuyo. Munthuyo amakhala woyima pa elevator kotero kuti kukula kwa mphamvu yachibadwa kuli kofanana ndi kulemera kwa munthuyo. Kulemera kooneka kuli kofanana ndi kupanikizika kwa mapazi a munthuyo pansi.

Dongosolo Lonyamula Chingwe cha Pulley

6. Zinthu ziwiri A ndi B, chilichonse chokhala ndi kulemera kwa 6 kg ndi 2 kg, zimamangiriridwa ndi chingwe pamwamba pa pulley monga momwe zasonyezedwera pachithunzichi. Ngati kukangana pakati pa chingwe ndi pulley sikunyalanyazidwa ndipo g = 10 ms ^-2 , ndiye kuti kukangana kwa chingwe ndi...

A. 20 N

B. 24 N

C. 27 N

D. 30 N

E. 50 N

Zokambirana

Amadziwika kuti:

m _A = 6 kg, m _B = 2 kg, g = 10 m/s ²

w _A = m _A g = (6 kg)(10 m/s ² ) = 60 kg m/s ²

w _B = m _B g = (2 kg)(10 m/s ² ) = 20 kg m/s ²

Funso: Kodi mphamvu ya chingwe (T) ndi yotani?

Yankho:

w _A > w _B motero dongosolo limayenda motsutsana ndi wotchi (m _A imatsika, m _B imakwera mmwamba).

Kuthamanga

ΣF = ma

w _A – w _B = (m _A + m _B ) a

60 – 20 = (6 + 2) a

40 = (8) a

a = 40 / 8 = 5 m/s ²

Kukanika kwa chingwe 

m _A ikutsika pansi

w _A – T _A = m _A a

60 – T _A = (6)(5)

60 – TA ₌ 30

TA = 60 - ₃₀

T ₂ = 30 Newton

m _B ikukwera mmwamba

T _B – w _B = m _B a

T _B – 20 = (2)(5)

T _B – 20 = 10

T _B = 10 + 20

T ₁ = 30 Newton

Kukanika kwa chingwe (T) = 30 Newtons.

Yankho lolondola ndi D.

7. Yang'anani chithunzi chomwe chili m'mbali! Kukangana kwa chingwe ndi pulley sikunyalanyazidwa. Ngati kulemera A = 5 kg, g = 10 ms s ^—2 ndipo A ikutsika ndi kuthamanga kwa 2,5 ms s ^—2 , ndiye kulemera kwa B ndi kotani?

A. 0,5 kg

B. 1 kg

C. 1,5 kg

D. 2 kg

E. 3 kg

Zokambirana

Amadziwika kuti:

Kulemera A (m _A ) = 5 kg

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Kuthamanga A kapena kuthamanga kwa dongosolo (a) = 2,5 m/s ²

Kulemera A (w _A ) = (m _A )(g) = (5)(10) = 50 Newtons

Anafunsa kuti: kulemera kwa B (m _B ) ndi kotani?

Yankho:

Block A imatsika pansi motero kulemera kwa A (w _A ) kumakhala kwakukulu kuposa kulemera kwa B (w _B ).

Gwiritsani ntchito lamulo lachiwiri la Newton:

ΣF = ma

w _A – w _B = (m _A + m _B ) a

50 – (m _B )(10) = (5 + m _B ) (2,5)

50 – 10 m _B = 12,5 + 2,5 m _B

50 – 12,5 = 2,5 m _B + 10 m _B

37,5 = 12,5 m _B

m _B = 3 kg

Yankho lolondola ndi E.

8. Zinthu ziwiri zokhala ndi kulemera kwa 2 kg ndi 3 kg zimamangidwa ndi chingwe kenako zimamangiriridwa ku pulley yomwe kulemera kwake sikunyalanyazidwa monga momwe chithunzichi chikusonyezera.

Ngati kukula kwa mphamvu yokoka = 10 ms ^-2 , mphamvu ya mphamvu ya chingwe yomwe imakumana ndi dongosololi ndi...

A. 20 N

B. 24 N

C. 27 N

D. 30 N

E. 50 N

Zokambirana

Amadziwika kuti:

m ₁ = 2 kg, m ₂ = 3 kg, g = 10 m/s ²

w ₁ = (m ₁ )(g) = (2 kg)(10 m/s ² ) = 20 kg m/s ² kapena 20 Newtons

w ₂ = (m ₂ )(g) = (3 kg)(10 m/s ² ) = 30 kg m/s ² kapena 30 Newtons

Funso: Kodi mphamvu ya chingwe (T) ndi yotani?

Yankho:

w ₂ > w ₁ chifukwa chake dongosolo limayenda mozungulira wotchi (m ₂ imatsika, m ₁ imakwera mmwamba).

Kuthamanga

ΣF = ma

w ₂ – w ₁ = (m ₁ + m ₂ ) a

30 – 20 = (2 + 3) a

10 = (5) a

a = 10 / 5 = 2 m/s ².

Kukanika kwa chingwe 

m2 _ikutsika pansi

w ₂ – T ₂ = m ₂ a

30 – T ₂ = (3)(2)

30 – T ₂ = 6

T ₂ = 30 – 6

T ₂ = 24 Newton

m ₁ ikukwera mmwamba

T ₁ – w ₁ = m ₁ a

T ₁ – 20 = (2)(2)

T ₁ – 20 = 4

T ₁ = 20 + 4

T ₁ = 24 Newton

Kukanika kwa chingwe (T) = 24 Newtons.

Yankho lolondola ndi B.

9. Mabuloko awiri amalumikizidwa ndi pulley yosalala ndipo kulemera kwa pulley sikunyalanyazidwa monga momwe zasonyezedwera pachithunzichi. Kulemera A = m _A , kulemera B = m _B ndi block B kumagwa ndi kuthamanga a. Ngati kuthamanga chifukwa cha mphamvu yokoka ndi g, ndiye kuti kukula kwa mphamvu ya chingwe komwe kumachitika mu block B ndi…

A. T = m_B.a

B. T = m _A (a – g)

C. T = m _A (g – a)

D. T = m _B (a – g)

E. T = m _B (g – a)

Zokambirana

Malo osalala ndi osalala kotero palibe mphamvu yokangana yomwe imaletsa kuyenda kwa block A. Mphamvu yomwe imasuntha dongosolo la block ndi kulemera kwa block B.

Werengerani kuthamanga kwa dongosolo:

Werengani mphamvu ya chingwe (T):

Taganizirani kayendetsedwe ka chinthu chimodzi, mwachitsanzo A. A akupita kumanja.

Sinthani m _A mu equation 1 ndi m _A mu equation 2.

Yankho lolondola ndi E.

10. Chipika cholemera makilogalamu 10 chimayikidwa pansi yosalala kenako chimakokedwa ndi mphamvu yopingasa F. Ngati coefficient of static friction ndi μ_s = 0,5 ndi coefficient ya kinetic friction μ_k = 0,3. Dziwani kukula kwa mphamvu yokangana pamene chipikacho chatsala pang'ono kusuntha. (g = 10 m/s)²)
Zokambirana
Chipikacho chidzasuntha ndendende ngati kukula kwa mphamvu yokoka = kukula kwa mphamvu yayikulu yokhazikika. Kukangana kosasunthika kumagwira ntchito pa chinthu (kuletsa kuyenda kwa chinthucho) pamene chinthucho chikukokedwa koma chinthucho sichinasunthebe. Kukangana kosasunthika kumakhala ndi mtengo wapamwamba kwambiri pamene chinthucho chili pafupi kusuntha (chinthucho sichinasunthebe, chinthucho chili pafupi kusuntha). Mosiyana ndi zimenezi, kukangana kosasunthika kumagwira ntchito pa chinthu (kuletsa kuyenda kwa chinthucho) pamene chinthucho chikuyenda kale.
Amadziwika kuti:
Funso: Mphamvu yayikulu yokangana yosasinthasintha (f)_s)?
Yankho:
Ngati chinthucho chili pa mtunda wathyathyathya monga momwe zilili pachithunzichi, kukula kwa mphamvu yachibadwa = kulemera kwa chinthucho.
Mphamvu yachibadwa (N) = mphamvu yokoka (w) = 100 Newtons
Mphamvu yayikulu yolimbana ndi kusakhazikika:
Kuchuluka kwa kupsinjika kwa kinetic sikugwiritsidwa ntchito powerengera.

11. Mabuloko awiri amalumikizidwa ndi chingwe chopepuka chomwe chimakokedwa ndi mphamvu yopingasa F = 20 N (onani chithunzi). Ngati g = 10 ms^-2 ndipo coefficient ya kinetic friction pakati pa block ndi pamwamba ndi 0,1, kudziwa kukula kwa kuthamanga kwa block...
Zokambirana
Amadziwika kuti:
Anafunsa: kufulumira (a) kwa chipikacho?
Yankho:
12. Block A yokhala ndi kulemera kwa 2 kg ndi B yokhala ndi kulemera kwa 4 kg yakonzedwa monga momwe zasonyezedwera pachithunzichi. Ngati coefficient of friction ya pansi ndi yochulukitsa katatu coefficient of friction ya block B, block A idzayenda ndi liwiro la 5 m/s.^-2Kotero chiŵerengero cha mphamvu yokangana pakati pa chipika A ndi pansi pa chipika A ndi B ndi… g = 10 m/s²
Zokambirana
Amadziwika kuti:
Anafunsa kuti:
Kuyerekeza mphamvu yokangana ya chipika A ndi pansi (f)_{s A}) ndi mphamvu yokangana ya mabuloko A ndi B (f_{s B})?
Yankho:

13. Yang'anani chithunzi chomwe chili pambali! Kulemera kwa chipika chilichonse ndi m.₁ = 2 kg ndi m₂ = 3 kg ndipo kulemera kwa pulley sikunyalanyazidwa. Ngati pamwamba pa ndege pali yosalala ndipo g = 10 ms^-2, ndiye kuti kuthamanga kwa dongosololi ndi ....
A. 0,5 ms^-2
B. 2,0 ms^-2
C. 2,5 ms^-2
D. 4,0 ms^-2
E. 6,0 ms^-2
Zokambirana
Amadziwika kuti:
m₁ = 2 kg, m₂ = 3 kg, g = 10 ms^-2
w₂ = m₂ g = (3)(10) = 30 kg m/s² kapena ma Newton 30
Funso: Kufulumizitsa dongosolo (a)?
Yankho:
14. Chinthu cholemera chimalumikizidwa ndi chingwe chodutsa mu pulley yosalala monga momwe chithunzichi chikusonyezera. Ngati m₁ = 2 kg, m₂ = 3 kg ndipo g = 10 ms^-2, ndiye kuti kukula kwa mphamvu ya kukakamira kwa chingwe T ndi…
A. 10,2 N
B. 13,3 N
C. 15,5 N
D. 18,3 N
E. 24,0 N
Zokambirana
Amadziwika kuti:
m₁ = 2 kg, m₂ = 3 kg, g = 10 ms^-2
w₁ = (2)(10) = 20 Newtons
w₂ = (3)(10) = 30 Newtons
Funso: Kodi mphamvu yogwira chingwe (T) ndi yaikulu bwanji?
Yankho:
w₂ = 30 Newtons ndi yayikulu kuposa w₁ = 20 Newtons chifukwa chake m₂ sunthirani pansi, m₁ pita mmwamba.
Fomula yachiwiri ya lamulo la Newton:
Mphamvu ya chingwe?
Malinga ndi njira yoyendetsera dongosolo kapena njira yofulumizitsira dongosolo, njira ya mphamvu yokoka m₂ pansi, njira ya mphamvu yolumikizira chingwe pa m₂ pamwamba:
w₂ - T₂ = m₂ a
30 – T₂ = (3)(2)
30 – T₂ = 6
T₂ = 30-6
T₂ = 24 Newton
Malangizo a mphamvu yokoka m₁ pansi, njira ya mphamvu yolumikizira chingwe pa m₁ pamwamba:
T₁ - w₁ = (m₁) (a)
T₁ – 20 = (2)(2)
T₁ - 20 = 4
T₁ = 4 + 20
T₁ = 24 Newton
Mphamvu yogwira chingwe (T) = T₁ = T₂ = 24 Newtons.

15. Mabuloko awiri, aliwonse olemera makilogalamu 4, amalumikizidwa ndi chingwe ndi pulley monga momwe zasonyezedwera pachithunzichi. Pamwamba ndi pulley ndi zosalala. Ngati block B ikukokedwa ndi mphamvu yopingasa ya 50 N, kuthamanga kwa block ndi… (g = 10 m/s²)
A. 1,25 m/s²
B. 7,5 m/s²
C. 10 m/s²
D. 12,5 m/s²
E. 15 m/s²
Zokambirana
Amadziwika kuti:
m_A = 4 kg, m_B = 4 kg, g = 10 m/s²
w_A = (m_A)(g) = 4)(10) = 40 Newton
F = 50 Newton
Anafunsa: kufulumizitsa dongosolo?
Yankho:
Fomula yachiwiri ya lamulo la Newton:
Kuthamanga kwa mabuloko onse awiri ndi 1,25 m/s². Njira yoyendetsera mabuloko awiriwa = njira ya mphamvu yokoka F.

16. Yang'anani chithunzi chomwe chili m'mbali! Unyinji wa mabuloko ndi m ₁ = 6 kg ndipo m ₂ = 4 kg, ndipo unyinji wa pulley sunyalanyazidwa. Ngati pamwamba pa ndege pali yosalala ndipo g = 10 ms ⁻² , ndiye kuti kuthamanga kwa dongosolo ndi….

A. 0,5 ms^-2
B. 2,0 ms^-2
C. 2,5 ms^-2
D. 4,0 ms^-2
E. 5,0 ms^-2

Zokambirana
Amadziwika kuti:
m₁ = 6 kg, m₂ = 4 kg, g = 10 m/s²
w₁ = m₁ g = (6 kg)(10 m/s²) = 60 kg m/s² kapena ma Newton 60
w₂ = m₂ g = (4 kg)(10 m/s²) = 40 kg m/s² kapena ma Newton 40
Anafunsa: kufulumizitsa dongosolo (a)?
Yankho:

m₁ili pamalo osalala, osalala popanda kukangana kotero kuti dongosololi limayendetsedwa ndi mphamvu yokoka buloko 2.
Terapkan Lamulo lachiwiri la Newton :
∑F = ma
w₂ = (m₁ +m₂) ndi
40 N = (6 kg + 4 kg) a
40 N = (10 kg) a
a = 40 N / 10 kg
a = 4 m/s²
Yankho lolondola ndi D.

17. Mabuloko awiri, aliwonse okhala ndi kulemera kwa 2 kg, amalumikizidwa ndi chingwe ndi pulley monga momwe zasonyezedwera pachithunzichi. Pamwamba ndi pulley ndi zosalala. Ngati block B yakokedwa ndi mphamvu yopingasa ya 40 N, kuthamanga kwa block ndi… (g = 10 m/s ² )

A. 5 m/s²
B. 7,5 m/s²
C. 10 m/s²
D. 12,5 m/s²
E. 15 m/s²

Kukambirana:
Amadziwika kuti:
m_A = m_B = 2 kg, g = 10 m/s², F = 40 N
w_A = mg = (2)(10) = 20 N
Funso: kufulumira kwa block (a)?
Yankho:
Pamwamba pa chipikacho ndi posalala, motero mphamvu yomwe imakhudza kayendedwe ka chipikacho ndi yokhayo mphamvu F ndi kulemera kwa chipika A.
Gwiritsani ntchito lamulo lachiwiri la Newton:
∑F = ma
F – w_A = (m_A +m_B) ndi
40 – 20 = (2 + 2) a
20 = (4) a
a = 20 / 4
a = 5 m/s²
Yankho lolondola ndi A.

Ndege yopendekera

18. Buloko lolemera makilogalamu awiri lili pamalo osalala okhala ndi ngodya yopendekera = 30^o, kotero kuti chipikacho chiziyenda ndi liwiro losalekeza. Ngati g = 10 ms^-2, ndiye kuti kukula kwa mphamvu yomwe imasuntha chipikacho ndi...
A. 5 N
B. 6 N
C. 7 N
D. 8 N
E. 10 N
Zokambirana
Amadziwika kuti:
m = 2 kg, g = 10 m/s², theta = 30^o
w = mg = (2)(10) = 20 kg m/s² = 20 n
Funso: Ndi mphamvu iti yomwe imasuntha chipikacho?
Yankho:

Mphamvu yomwe imasuntha chipikacho ndi w_x.
w_x = w sin teta
w_x = (20 N)(chimo 30^o)
w_x = (20 N)(0,5)
w_x = 10 N.
Mphamvu yomwe imasuntha chipikacho ndi ma Newton 10.
Yankho lolondola ndi E.

19. Mabuloko awiri amalumikizidwa ndi chingwe chopepuka chomwe chimakokedwa ndi mphamvu yopingasa F = 24 N. g = 10 ms^-2 ndipo pansi pake pali poterera. Kukula kwa kuthamanga kwa chipika pogwiritsa ntchito lamulo lachiwiri la Newton pa chinthu chilichonse ndi...
Zokambirana
Amadziwika kuti:
m₁ = 2 kg, m₂ = 4 kg, F = 24 N
Funso: Kodi kuthamanga kwa block (a) ndi chiyani?
Yankho:
Kukula kwa kuthamanga kwa chipikacho ndi 4 m/s².

20. Mukakhala mu elevator yosasuntha, kulemera kwa Sandi ndi 500 N. Kuthamanga chifukwa cha mphamvu yokoka = 10 ms^-2Chikepe chikathamanga, mphamvu ya chingwe imakhala 750 N. Chifukwa chake, kuthamanga kwa chikepe kumakhala...
A. 5,0 ms^-2
B. 7,5 ms^-2
C. 10,0 ms^-2
D. 12,5 ms^-2
E. 15,0 ms^-2
Zokambirana
Amadziwika kuti:
w = 500 N, g = 10 m/s², T = 750 N
Funso: kuthamangitsa elevator (a)?
Yankho:
Chiwerengero cha mawu achinsinsi:
w = mg
500 = m (10)
m = 500 / 10
m = 50 makilogalamu
Kulemera kwa chokweza sikudziwika kotero kulemera konse kwa chokweza ndi zomwe zili mkati mwake = kulemera kwa code.
Malinga ndi lamulo loyamba la Newton, ngati elevator ikadalipo, mphamvu yake = 0.
Mphamvu ya kukakamira kwa chingwe (T) pamene chokweza sichikuyenda bwino = 500 N.
Pamene elevator ikuthamanga, mphamvu ya chingwe (T) imakhala 750 N kapena imawonjezeka ndi 250 N.

Kuthamanga kwa elevator ndi 5 m/s² ndipo njira yothamangira = njira yoyendetsera chikepicho ili mmwamba.

Gwero la funso:

Mafunso a National Examination Physics a Senior High School/Vocational High School