Chitsanzo cha mafunso ofunikira a sukulu ya sekondale

Zitsanzo 4 za mafunso okhudza ndege yopendekeka ndi SMP

1. Dziwani zambiri!

Trolley yolemera 10 N imakokedwa kuchokera pansi pa ndege yopendekeka mpaka itafika pamwamba pa ndege yopendekeka. gaya F yofunikira ndi…

A. 15,0 N

B. 12,5 N

C. 5,0 N

D. 2,5 N

Zokambirana

Amadziwika kuti:

Kulemera kwa trolley (w) = 10 Newton

Kutalika kwa ndege yopendekeka = mamita awiri

Kutalika kwa ndege yopendekeka = mamita 0,5

θ = ngodya pakati pa ndege yosalala ndi ndege yopendekera

Sin θ = 0,5/2 = 0,25

Anafunsa kuti: Kukula kwa mphamvu F

Yankho:

w_x ndi gawo la kulemera kwa trolley lomwe limagwirizana ndi ndege yopendekera

w_y ndi gawo la kulemera kwa trolley lomwe lili molunjika ku ndege yopendekera

Kuti trolley ikokedwe mmwamba, mphamvu yokoka F iyenera kukhala yofanana ndi w_x.

w_x = uchimo θ = (10 Newton)(0,25) = 2,5 Newton

Kotero mphamvu yokoka F = 2,5 Newton

Yankho lolondola ndi D.

2.

Chinthu chopangidwa ndi matabwa osalala chidzakwezedwa pamalo osalala monga momwe chithunzichi chikusonyezera. Ngati kulemera kwa matabwawo ndi 6 kg, g = 10 m/s², ndiye kuti kukula kwa mphamvu yokankhira kuti ikweze chipika kuchokera ku P kupita ku Q ndi…

A. 36 Newton
B. 24 Newton
C. 20 Newton
D. 12 Newton

Zokambirana

Berat mtanda: w = mg = (6)(10) = 60 kg m/s² = 60 Newton
Ma block osalala ndi ma plane opendekera ndi osalala kotero amaonedwa kuti alibe kukangana. gesekanKuti chipikacho chisunthidwe mmwamba, mphamvu yocheperako yokankhira iyenera kukhala yofanana ndi gawo la kulemera kwa chipikacho molingana ndi ndege yopendekera, yomwe ndi w_x.
w_x = w sin teta = (w) (mbali yakutsogolo/hypotenuse)
w_x = (60)(20/60) = (60)(1/3) = 20 Newtons
Yankho lolondola ndi C.

3.

Wantchito akufuna kusuntha bokosi pa galimoto yolemera ma Newton 500 pogwiritsa ntchito plane yopendekera monga momwe chithunzi chili pansipa chikusonyezera. Ngati galimotoyo ili ndi kutalika kwa 1,5 m, kodi pamafunika mphamvu zingati kuti bokosilo lisunthe?

A. 125 N
B. 250 N
C. 500 N
D. 1500 N

Zokambirana
Kulemera kwa bokosi (w) = 500 Newton
Kuti bokosilo lisunthidwe mmwamba, mphamvu yocheperako yokankhira iyenera kukhala yofanana ndi gawo la mphamvu yokoka ya bokosilo yofanana ndi ndege yopendekera, yomwe ndi w_x.
w_x = w sin teta = (w) (mbali yakutsogolo/hypotenuse)
w_x = (500)(1,5/3) = (500)(1/2) = 250 Newtons
Yankho lolondola ndi B.

4.
Chida cholemera chiyenera kunyamulidwa pogwiritsa ntchito thabwa ngati mtunda wopendekera, monga momwe chithunzichi chikusonyezera. Kuti muwonetsetse kuti mphamvu yonyamulira ndi theka la kulemera kwenikweni kwa kreti, thabwa lokhala ndi kutalika kwa...
A. 5,0 m
B. 7,5 m
C. 10,0 m
D. 12,5 m
Zokambirana
Kulemera kwa bokosi = w
Kuti bokosilo lisunthidwe mmwamba, mphamvu yocheperako yokankhira iyenera kukhala yofanana ndi gawo la mphamvu yokoka ya bokosilo yofanana ndi ndege yopendekera, yomwe ndi w_xKotero kuti kukula kwa mphamvu yokankhira ndi kuwirikiza 0,5 kulemera kwa bokosi, kutalika kwa bolodi ndi…
w_x = w sin teta
w_x = (w)(mbali yakutsogolo/hypotenuse)
0,5 (w)= (w)(2,5/x)
0,5 = (2,5/x)
x = 2,5/0,5 = mamita 5
Yankho lolondola ndi A.

Gwero la funso:

Mafunso a Mayeso a Sayansi ya Sukulu ya Sekondale/Chisilamu cha Sukulu ya Sekondale