Chitsanzo cha mafunso a mphamvu wamba

Zitsanzo 9 za Mafunso Abwinobwino a Mphamvu

1. Chipika chili pamalo opumira. Kulemera kwa chipikacho (m) = 1 kg, kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²Kukula ndi malangizo a mphamvu yachibadwa (N) ndi...
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Ndizodziwika kuti :
Kulemera kwa chipika (m) = 1 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Mphamvu yokoka (w) = mg = (1 kg)(10 m/s²) = 10 kg m/s² = 10 Newton
Anafunsa : kukula ndi malangizo a mphamvu yachibadwa (N)
Yankhani :
Malangizo a mphamvu yachibadwa (N) akuwonetsedwa monga momwe zasonyezedwera pansipa.

Kukula kwa mphamvu yachibadwa
Lamulo Loyamba la Newton limati ngati chinthu chili pamalo opumulira, mphamvu yochokera pa chinthucho ndi 0. Pali mphamvu yotsika (w). Popeza chipikacho chili pamalo opumulira, payenera kukhala mphamvu yokwera yomwe imalinganiza kulemera, kotero mphamvu yochokerapo ndi zero. Mphamvu yokwera yomwe imalinganiza kulemera ndi mphamvu yachibadwa (N). Mwa masamu:
2. Mabuloko onse awiri ali pamalo opumulira. Kulemera kwa boloko 1 (m₁) = 1 kg, kulemera kwa chipika 2 (m₂) = 2 kg, kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²Kukula ndi malangizo a mphamvu yachibadwa yomwe imagwira ntchito pa block 1 (N)₁) ndi chipika 2 (N₂) ndi…
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Ndizodziwika kuti :
Kulemera kwa chipika 1 (m₁) = 1 kg
Kulemera kwa chipika 2 (m₂) = 2 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Kulemera kwa chipika 1 (w)₁) = m₁ g = (1)(10 m/s²) = 10 kg m/s² = 10 Newton
Kulemera kwa chipika 2 (w)₂) = m₂ g = (2)(10 m/s²) = 20 kg m/s² = 20 Newton
Anafunsa : N₁ ndi N₂
Yankhani :
(a) Mphamvu yachibadwa yomwe imagwira ntchito pa block 1 (N)₁)
N₁ = w₁ = 10 Newton
Malangizo N₁ monga momwe zilili pachithunzi pamwambapa.
(b) Mphamvu yachibadwa yomwe imagwira ntchito pa block 2 (N)₂)
N₂ = w₁ +w₂ = Ma Newton 10 + Ma Newton 20 = Ma Newton 30
Malangizo N₂ monga momwe zilili pachithunzi pamwambapa.

3. Chipikacho chili pamalo opumulira. Kulemera kwa chipikacho (m) = 2 kg, kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s², mphamvu F = 10 Newton. Kukula ndi malangizo a mphamvu yachibadwa (N) yomwe ikugwira ntchito pa boloko ndi…
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chipika (m) = 2 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Mphamvu yokoka (w) = mg = (2 kg)(10 m/s²) = 20 kg m/s² = 20 Newton
Mphamvu (F) = 10 Newtons
Anafunsa : kukula ndi malangizo a mphamvu yachibadwa (N)
Yankhani :
Kayendedwe ka mphamvu yachibadwa kali monga momwe zilili pachithunzi pamwambapa.
Kukula kwa mphamvu yachibadwa:
4. Chipikacho chili pamalo opumulira. Kulemera kwa chipikacho (m) = 1 kg, kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²mphamvu F₁ = 10 Newton, F₂ = 20 Newton. Kukula ndi malangizo a mphamvu yachibadwa (N) yomwe ikugwira ntchito pa boloko ndi…
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chipika (m) = 1 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Mphamvu yokoka (w) = mg = (1 kg)(10 m/s²) = 10 kg m/s² = 10 Newton
F₁ = 10 Newton
F₂ = 20 Newton
Anafunsa : kukula ndi malangizo a mphamvu yachibadwa (N)
Yankhani :

Kayendedwe ka mphamvu yachibadwa kali monga momwe zilili pachithunzi pamwambapa.

5. Kulemera kwa chipika (m) = 2 kg, kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²ngodya = 60^oKukula ndi malangizo a mphamvu yachibadwa (N) yomwe ikugwira ntchito pa bolodi ndi…
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Mawu ofotokozera:
w = mphamvu yokoka, w_x = gawo la mphamvu yokoka lofanana ndi pamwamba pa ndege yopendekeka, w_y = gawo la mphamvu yokoka yolunjika ku ndege yopendekera, N = mphamvu yachibadwa, f_k = mphamvu ya kukangana kwa kinetic.
Ndizodziwika kuti :
Anafunsa : kukula ndi malangizo a mphamvu yachibadwa (N)
Yankhani :
Chinthu sichisuntha molunjika pamwamba pa ndege yopendekeka, motero malinga ndi lamulo loyamba la Newton, mphamvu yochokera munjira yolunjika pamwamba pa ndege yopendekeka iyenera kukhala yofanana ndi zero.
Pali mphamvu ziwiri zomwe zimagwira ntchito molunjika pamwamba pa ndege yopendekeka, zomwe ndi mphamvu ya wy ndi mphamvu yachibadwa. Zotsatira za mphamvu ziwirizi = 0. Mwa masamu:
Kotero kukula kwa mphamvu yachibadwa ndi ma Newton 10.

[Chingerezi: Mphamvu yachibadwa - mavuto ndi mayankho]

6. Yang'anani chithunzi cha chipika chili pansipa! Ngati kulemera kwa chipikacho ndi 2 kg ndipo kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s^-2 ndiye mphamvu yachibadwa yomwe imapezeka ndi chipikacho ndi….

A. 25 N
B. 30 N
C. 33 N
D. 43 N
E. 45 N
Zokambirana
Amadziwika kuti:
w = mg = (2 kg)(10 m/s²) = 20 kg m/s² = 20 Newton
F₁ = 10 n
F₂ = 5 n
Anafunsa kuti:
Mphamvu yachibadwa (N) yomwe imapezeka ndi chipikacho?
Yankho:

Mphamvu yochokera mu njira yoyimirira ndi iyi:
F₁ + w – F₂ = 10 N + 20 N – 5 N = 25 N
Ngati mphamvu yotsika = 25 N ndiye kuti mphamvu yachibadwa = 25 N kotero chinthucho sichinayime.
Yankho lolondola ndi A.

7. Ngati mphamvu yachibadwa yomwe imagwira ntchito pa boloko ndi 20 N, ndiye kuti kukula ndi malangizo a mphamvu yakunja yomwe ikugwira ntchito pa boloko ndi...

A. 50 N ndi pansi
B. 30 N ndi kupitirira apo
C. 30 N ndi pansi
D. 20 N ndi kupitirira apo
E. 20 N ndi pansi
Zokambirana
Amadziwika kuti:
Mphamvu yokoka (w) = 40 N
Mphamvu yachibadwa (N) = 20 N
Funso: Kodi kukula ndi njira ya mphamvu yakunja ndi yotani kotero kuti mphamvu yachibadwa = 20 N?
Yankho:
Kukula kwa mphamvu yachibadwa = 20 N ndipo njira ya mphamvu yachibadwa ili mmwamba. Chinthucho chili pamalo ake, choncho njira ya mphamvu yotsika yomwe imalinganiza mphamvu yachibadwa iyenera kukhala yofanana ndi 20 N.
Kukula kwa mphamvu yokoka = 40 N ndipo njira yake ndi yotsika kotero mphamvu yakunja ya 20 N ikufunika yomwe imatsogozedwa mmwamba.
Yankho lolondola ndi D.

8. Yang'anani chithunzi chotsatira cha chipika. Ngati kulemera kwa chipikacho ndi 3 kg ndipo kuthamanga chifukwa cha mphamvu yokoka 10 ms^-2 Maka mphamvu yachibadwa zomwe block imakumana nazo ....

A. 27 N
B. 30 N
C. 33 N
D. 43 N
E. 45 N

Zokambirana
Amadziwika kuti:
w = mg = (3 kg)(10 m/s²) = 30 Newton (njira yopita pansi)
F₁ = 5 N (njira yopita pansi)
F₂ = 8 N (njira yopita mmwamba)
Funso: Mphamvu yachibadwa (N)?
Yankho:

Mphamvu yachibadwa imagwira ntchito pansi pa mtengo ndipo imakhala yolunjika pamwamba pa nthaka. Kuwonjezera pa mphamvu yachibadwa, pali mphamvu zitatu zomwe zimagwira ntchito pa mtengowo, zomwe ndi F₁, F₂ ndi w. Kukula kwa mphamvu yachibadwa ndi kofanana ndi zotsatira za mphamvu zitatuzi, kotero kuti mphamvu yochokera mbali yowongoka ndi yofanana ndi zero, chinthucho chili chete ndipo Lamulo loyamba la Newton kukwaniritsidwa.
Mphamvu zomwe zili mbali imodzi zimawonjezedwa pamodzi ndipo zomwe zili mbali zosiyana zimachotsedwa.
w + F1 – F2 = 30 + 5 – 8 = 35 – 8 = 27 N
Zotsatira za mphamvu zitatuzi ndi 27 N. Kukula kwa mphamvu yachibadwa = 27 Newtons.
Yankho lolondola ndi A.

9. Ngati mphamvu yachibadwa yomwe imagwira ntchito pa boloko ndi 20 N, ndiye kuti kukula ndi malangizo a mphamvu yakunja yomwe ikugwira ntchito pa boloko ndi...

A. 50 N ndi pansi
B. 30 N ndi kupitirira apo
C. 30 N ndi pansi
D. 20 N ndi kupitirira apo
E. 20 N ndi pansi

Zokambirana
Amadziwika kuti:
w = 50 N
N = 20 N
Funso: Kodi mphamvu yakunja (F) ikugwira ntchito pa block ndi yaikulu bwanji?
Yankho:
Kuti mphamvu yachibadwa (N) = 20 N, payenera kukhala mphamvu yakunja (F) = 30 N ndipo mbali ina mphamvu yokoka (w) = 50 N.
Kukula kwa mphamvu yakunja (F) = 30 N, komwe mphamvu yakunja ikupita mmwamba.
Yankho lolondola ndi B.