Ifomula Yomthetho KaNewton

Imibuzo eyisibonelo namafomula emithetho kaNewton

Umthetho Wokuqala KaNewton

1. Umuntu usesiliftini esihamba ngesivinini esingaguquki sikhuphukela phezulu. Isisindo somuntu singama-800 N. Kungazelelwe ikhebula lensimbi elidonsa i-lifti liyaphuka, okwenza i-lifti iwe. Amandla avamile avela phansi esiliftini kumuntu ngaphambi nangemva kokuphuka kwekhebula lensimbi….

1. 800 N kanye no-0
2. 800 N kanye no-800 N
3. 1600 N kanye no-0
4. 1600 N kanye no-800 N

Ingxoxo
Kuyaziwa ukuthi:
Isisindo (w) = 800 Newtons
Umbuzo: Amandla avamile (N) asebenza kumuntu ngaphambi nangemva kokuphuka kwentambo yensimbi
Impendulo:
Imizuzwana ngaphambi kokuba intambo yensimbi iphuke
Uma umuntu emi phansi kwe-lifti, amandla adonsela phansi asebenza kumuntu futhi isiqondiso samandla adonsela phansi siya phansi (bheka umfanekiso ongezansi). Umuntu umile e-lifti ngakho-ke kumele kube namandla avamile alinganisa isisindo somuntu, lapho la mandla enesiqondiso esikhuphukayo futhi silingana nobukhulu bamandla adonsela phansi. Amandla avamile phansi asebenza kumuntu futhi la mandla asebenza kumuntu.
Ngenxa yokuthi umuntu umile e-lifti futhi i-lifti ihamba ngesivinini esingaguquki (akukho ukusheshisa), amandla avelayo asebenza kumuntu ayi-zero.
∑F = 0
N – w = 0
N = w
N = 800 Newton

Ngemva kokuba intambo yensimbi iphuke
Ngemva kokuba ikhebula lensimbi liphukile, ilifti nomuntu bawela ndawonye ngokukhululeka, lapho ubukhulu kanye nesiqondiso sokusheshisa ukuwa ngokukhululeka kwe-lifti nomuntu kulingana nokusheshisa kwamandla adonsela phansi eMhlabeni. Ilifti nomuntu bawela ndawonye ngokukhululeka ukuze kungabikho mandla ajwayelekile asetshenziswa yiphansi le-lifti kumuntu. Umuntu uyawa futhi izinyawo zomuntu azikwazi ukucindezela phansi kwe-lifti ngoba ne-lifti nayo iyawa.
Impendulo efanele ngu-A.

2. Amandla amathathu, ngalinye elinobukhulu obungu-F1 ₌ 22 N, F2 ₌ 18 N, kanye no-F3 ₌ 40 N, asetshenziswa ebhulokini lokhuni. Amandla asebenza ebhulokini, alalela umthetho wokuqala kaNewton, aboniswe esithombeni...

Ingxoxo

Umthetho Wokuqala KaNewton: Amandla Aphumelayo ( ΣF) = 0.

A. F ₁ + F ₂ – F ₃ = 22 N + 18 N – 40 N = 40 N – 40 N = 0

B. F ₂ + F ₃ – F ₁ = 18 N + 40 N – 22 N = 58 N – 22 N = 36 N (ngakwesokudla)

C. F ₂ + F ₃ – F ₁ = 18 N + 40 N – 22 N = 58 N – 22 N = 36 N (ngakwesokudla)

D. F ₁ + F ₃ – F ₂ = 22 N + 40 N – 18 N = 62 N – 18 N = 44 N (ngakwesobunxele)

Impendulo efanele ngu-A.

Umthetho Wesibili KaNewton

3.
Bheka isithombe!
Ibhulokhi engu-40 kg idonswa ngamandla angu-200 N, okuholela ekusheshiseni okungu-3 m/s² Ngakho ubukhulu bamandla okungqubuzana okwenzeka entweni/ebhulokini...

1. I-15 N
2. I-40 N
3. I-43 N
4. I-80 N

Ingxoxo
Kuyaziwa ukuthi:
IMisa (m) = 40 kg
Amandla (F) = 200 N
Ukusheshisa (a) = 3 m/s²
Umbuzo: Ubukhulu bamandla okungqubuzana (F)_g)
Impendulo:
Ifomula yomthetho wesibili kaNewton:
∑F = ma
Incazelo: ∑F = amandla aphumela, m = isisindo, a = ukusheshisa

Isiqondiso samandla u-F singakwesokudla kanti isiqondiso sokungqubuzana sikwesobunxele (isiqondiso sokungqubuzana siphambene nesiqondiso sokunyakaza kwento). Isiqondiso kwesokudla sikhethwa njengesihle kanti isiqondiso sobunxele sikhethwa njengesithiyo.
∑F = ma
F – F_g = umama
200 - F_g = (40)(3)
200 - F_g = 120
F_g = 200 - 120
F_g = 80 uNewton
Impendulo efanele ngu-D.

4. Ibhulokhi A enesisindo esingamagremu ayi-100 ibekwa phezu kwebhulokhi B enesisindo esingamagremu angu-300, bese ibhulokhi B isunduzwa ngamandla angu-5 N aqonde phezulu. Uma amabhulokhi engahambisani, khona-ke ubukhulu bamandla ajwayelekile ngebhulokhi B ebhulokhini A bungu….

1. I-1 N
2. I-1,25 N
3. I-2 N
4. I-3 N

Ingxoxo
Kuyaziwa ukuthi:
Amandla okusunduza (F) = 5 Newton
Isisindo sebhulokhi A (m_A) = amagremu angu-100 = 0,1 kg
Isisindo sebhulokhi B (m_B) = amagremu angu-300 = 0,3 kg
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s²
Isisindo sebhulokhi A (w)_A) = (0,1 kg)(10 m/s²) = 1 kg m/s² = 1 uNewton
Isisindo sebhulokhi B (w)_B) = (0,3 kg)(10 m/s²) = 3 kg m/s² = 3 uNewton

Umbuzo: Amandla ajwayelekile ngebhulokhi B kubhulokhi A
Impendulo:
Kunamandla amaningana asebenza kuzo zombili izithiyo, njengoba kuboniswe esithombeni esingezansi.
F = amandla okusunduza (asebenza kubhlokhi B)
w_A = amandla adonsela phansi ebhulokhi A (asebenza kubhulokhi A)
w_B = isisindo sebhulokhi B (esebenza kubhulokhi B)
N_A = amandla avamile ngebhulokhi B kubhulokhi A (asebenza kubhulokhi A)
N_A' = amandla avamile ngebhulokhi A kubhulokhi B (asebenza kubhulokhi B)

Cabanga ngamabhulokhi womabili njengohlelo olulodwa:
Sebenzisa umthetho wesibili kaNewton kuzo zombili izithiyo:
∑F = ma
F – w_A - w_B + N_A - N_A' = (m_A +m_B) futhi
N_A kanye no-N_A' amandla okusabela-isenzo anobukhulu obufanayo kodwa aphambene ngakho-ke asuswa kulesi sibalo.
F – w_A - w_B = (m_A +m_B) futhi
5 – 1 – 3 = (0,1 + 0,3) a
5 – 4 = (0,4) a
1 = (0,4) a
a = 1/0,4
a = 2,5 m/s²
Ukuba khona kwamandla (F) ama-Newton angu-5 asebenza ngokuvundlile phezulu kuzo zombili izithiyo kubangela ukuthi womabili amathiyo ahambe ngokuvundlile phezulu ngesivinini esingu-2,5 m/s.².

Cabanga ngebhulokhi A:
Sebenzisa umthetho wesibili kaNewton ukuvimba u-A:
∑F = ma
N_A - w_A = m_A a
N_A – 1 = (0,1)(2,5)
N_A - 1 = 0,25
N_A = 1 + 0,25
N_A = 1,25 uNewton
Amandla avamile ngebhulokhi B kubhulokhi A yi-1,25 Newton.
Impendulo efanele ingu-B.

Umthetho Wesithathu KaNewton

5. Naka lesi sitatimende esilandelayo!

(1) Abagibeli basunduzelwa phambili lapho ibhasi, elalihamba kancane kancane, libhuleka ngamandla ngokuzumayo.

(2) Inqwaba yezincwadi phezu kwekhadibhodi ngeke iwe uma ikhadibhodi lidonswa ngokushesha.

(3) Uma udlala i-skateboard, lapho unyawo olukhululekile lusunduza umhlabathi emuva, i-skateboard izoshelela phambili.

(4) Isikebhe sisunduzelwa emuva, isikebhe siya phambili.

Isitatimende esingenhla esivumelana nomthetho wesithathu kaNewton sithi...

A. (1) kanye no-(2)

B. (1) kanye no-(3)

C. (2) kanye no-(3)

D. (3) kanye (4)

Ingxoxo

(1) Umthetho wokuqala kaNewton

(2) Umthetho wokuqala kaNewton

(3) Umthetho wesithathu kaNewton

(4) Umthetho wesithathu kaNewton

Impendulo efanele ngu-D.

Umthombo wombuzo:

Imibuzo Yokuhlolwa Kazwelonke Yesayensi Yesikole Samabanga Aphansi/Isikole SamaSulumane Samabanga Aphakeme

Imibuzo ye-OSN yeFiziksi yeSikole Samabanga Aphezulu