Tšebeliso ea molao oa Newton oa ho tsamaea ka har'a lifti - mathata le litharollo

1. Motho ea boima ba lik'hilograma tse 50 ka har'a lifti. Ho potlaka ka lebaka la matla a khoheli = 10 m/s ² . Fumana matla a tloaelehileng a sebelisoang nthong ke lifti, haeba:

(a) lifti e phomotse

(b) lifti e theohela tlase ka lebelo le sa fetoheng

(c) lifti e potlakisitsoeng ho ea holimo ka lebelo le sa fetoheng 5 /s ²

(d) lifti e potlakisitsoeng ho theohela tlase ka lebelo le sa fetoheng la 5 m/s ²

(e) lifti nakong ea ho oa ka bolokolohi

tharollo

Tse tsejoang:

Boima ba motho (m) = 50 kg

Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s ²

Boima (w) = mg = (50)(10) = 500 Newtons

Ho batloa: Matla a tloaelehileng (N)

Tharollo:

(a) lifti e phomotse

Lifti e phomotse kahoo ha ho na ho potlaka (a = 0)

Re khetha tsela e eang holimo ka lehlakoreng le letle le tsela e eang tlase ka lehlakoreng le lebe.

Σ F = ma

N – w = 0

N = w

N = 500 Newton

(b) lifti e theohela tlase ka lebelo le sa fetoheng

Lebelo le sa fetoheng kahoo ha ho na ho potlaka (a = 0)

Re khetha tsela e eang holimo ka lehlakoreng le letle le tsela e eang tlase ka lehlakoreng le lebe.

Σ F = ma

N – w = 0

N = w

N = 500 Newton

(c) lifti e potlakisitsoeng ho ea holimo ka lebelo le tsitsitseng la 5 m/s ²

Tsela eo lebelo le tswelang ka yona e ya hodimo, kahoo re kgetha tsela e ntle jwalo ka tsela e yang hodimo.

N – w = ma

N = w + ma

N = 500 + (50)(5)

N = 500 + 250

N = 750 Newton

Motho o utloa mokatong o sutumelletsoa holimo ka matla ho feta ha lifti e eme kapa e tsamaea ka lebelo le sa fetoheng.

Haeba motho a eme sekaleng, sekala se bala boholo ba matla a theohelang a sebelisoang ke motho sekaleng. Ho ea ka molao oa boraro oa Newton, sena se lekana le boholo ba matla a tloaelehileng a holimo a sebelisoang ke sekala ho motho.

(d) lifti e potlakisitsoeng ho theohela tlase ka lebelo le sa fetoheng la 5 m/s ²

Tsela eo lebelo le potlakileng le shebileng ho yona e theohela tlase, kahoo re kgetha tsela e ntle e le e theohelang tlase.

w – N = ma

N = w – ma

N = 500 – (50)(5)

N = 500 – 250

N = 250 Newton

Boima ba motho ke 250 N, e leng boima bo ka tlase ho boima ba 'nete w = 500 N.

(e) lifti nakong ea ho oa ka bolokolohi

Ho wa ha mahala ho bolela hore ho potlaka ha lifti ho tšoana le ho potlaka ho bakoang ke matla a khoheli. Boholo ba ho potlaka ho bakoang ke matla a khoheli ke 9,8 m/s ² , tataiso ea eona e theohela tlase bohareng ba Lefatše. Lebelo le eketseha ka tatellano ka 9,8 m/s motsotsoana o mong le o mong.

Tsela eo lebelo le potlakileng le shebileng ho yona e theohela tlase, kahoo re kgetha tsela e ntle e le e theohelang tlase.

w – N = ma

N = w – ma

N = 500 – (50)(10)

N = 500 – 500

N = 0

[irp]

2. Fumana kgatello ka hara thapo ya lifti. Boima ba lifti = 2000 kg.

(a) lifti e phomotse

(b) lifti e potlakisitsoeng ho theohela tlase ka lebelo le sa fetoheng la 5 m/s ²

(c) lifti e potlakisitsoeng ho ea holimo ka lebelo le tsitsitseng la 5 m/s ²

(d) lifti nakong ea ho oa ka bolokolohi

Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s ²

tharollo

Tse tsejoang:

Boima ba lifti (m) = 2000 kg

Ho potlaka ha matla a khoheli (g) = 10 m/s ²

boima (w) = mg = (2000)(10) = 20,000 Newtons

Ho batloa: Matla a tsitsipano (T)

Tharollo:

(a) lifti e phomotse

lifti e phomotse kahoo ha ho na ho potlaka (a = 0)

Re khetha tsela e eang holimo e le tsela e ntle le tsela e eang tlase e le tsela e mpe.

Σ F = ma

T – w = 0

T = w

T = 20,000 Newton

Khatello ka har'a thapo (T) = boima ba lifti (w) = 20,000 Newtons

(b) lifti e potlakisitsoeng ho theohela tlase ka lebelo le sa fetoheng la 5 m/s ²

Tsela eo lebelo le potlakileng le shebileng ho yona e theohela tlase, kahoo re kgetha tsela e ntle e le e theohelang tlase.

w – T = ma

T = w – ma

T = 20,000 – (2000)(5)

T = 20,000 – 10,000

T = 10,000 Newton

c) lifti e potlakisitsoeng ho ea holimo ka lebelo le tsitsitseng la 5 m/s ²

Tsela eo lebelo le potlakileng le shebileng ka yona e theohela tlase, kahoo re kgetha tsela e ntle e le e yang hodimo.

T – w = ma

T = w + ma

T = 20,000 + (2000)(5)

T = 20,000 + 10,000

T = 30,000 Newton

(d) lifti nakong ea ho oa ka bolokolohi

Tsela eo lebelo le potlakileng le shebileng ho yona e theohela tlase, kahoo re kgetha tsela e ntle e le e theohelang tlase.

w – T = ma

T = w – ma

T = 20,000 – (2000)(10)

T = 20,000 – 20,000

T = 0

[ID ea sephutheloana sa wpdm='482′]

1. Boima le boima
2. Matla a tloaelehileng
3. Molao oa bobeli oa Newton oa ho sisinyeha
4. Matla a khohlano
5. Ho sisinyeha holim'a bokaholimo bo otlolohileng ntle le matla a khohlano
6. Motsamao oa 'mele e 'meli e nang le lebelo le tšoanang holim'a sebaka se bataletseng se bataletseng ka matla a khohlano
7. Motsamao sefofaneng se sekametseng ntle le matla a khohlano
8. Motsamao sefofaneng se sekametseng ka thata ka matla a khohlano
9. Motsamao ka lifting
10. Motsamao oa 'mele o hokahantsoe ka lithapo le li-pulleys
11. 'Mele e 'meli e nang le boholo bo tšoanang ba ho potlaka
12. Ho potoloha mothapo o bataletseng - matla a motsamao o chitja
13. Ho potoloha mothapo o kobehileng - matla a motsamao o chitja
14. Motsamao o tšoanang ka selikalikoe se otlolohileng
15. Matla a bohareng a motsamao o chitja o tšoanang