Isikhungo samandla adonsela phansi

Funda futhi imibuzo yesibonelo se-Center of Gravity

Ukuqonda Isikhungo Sokudonsa Amandla
Into eqinile ibhekwa njengeyakhiwe yizinhlayiya eziningi ngenxa yalokhu amandla adonsela phansi esebenza kuleyo naleyo zinhlayiya. Ngamanye amazwi, inhlayiya ngayinye inesisindo sayo. Isikhungo samandla adonsela phansi sento yiphuzu eliseceleni noma eduze kwento lapho isisindo sazo zonke izingxenye zento sigxile khona.

Uma into ifana (ubuningi bezinto ezithile bufana noma into yakhiwe ngezinto ezifanayo) futhi ukuma kwento kufana (isibonelo isikwele, unxande, indilinga) khona-ke isikhungo samandla adonsela phansi sento sihambisana nesikhungo sesisindo sento esiphakathi nendawo yento. Kunxantathu, isikhungo sesisindo sitholakala ku-1/3 h, lapho u-h = ukuphakama konxantathu.

Isikhungo sefomula yamandla adonsela phansi
Uma isimo sento silingana futhi into ifana khona-ke isikhungo samandla adonsela phansi sihambisana nesikhungo sobunzima bento, lapho isikhungo samandla adonsela phansi futhi isikhungo sobunzima sitholakala phakathi nento. Ngokuphambene nalokho, uma into ifana kodwa ingalingani, indawo yesikhungo sokudonsa phansi sento inganqunywa kusetshenziswa ifomula elandelayo:
Imininingwane:
x = indawo ephakathi yento ku-x-axis, y = indawo ephakathi yento ku-y-axis, A = indawo yento.

Isibonelo sezinkinga

1. Umbuzo Wokuhlolwa Kukazwelonke ka-2011/2012 C61 No.12

Bheka isithombe sendiza efanayo! Indawo ephakathi nendawo yamandla adonsela phansi yesistimu yento ohlangothini lwe-y-axis ukusuka endaweni ethi Q…

A. 1,00 cm
B. 1,75 cm
C. 2,00 cm
D. 3,00 cm
E. 3,25 cm

Ingxoxo

Hlukanisa into ibe izingxenye ezimbili, ingxenye 1 = unxande, ingxenye 2 = unxantathu.
A₁ = (12,5)(2) = 25
A₂ = ½ (12,5-2,5)(3) = ½ (10)(3) = (5)(3) = 15
y₁ = ½ (2) = 1
y₂ = 1/3 (3) + 2 = 1 + 2 = 3
Ama-coordinates enkabeni yamandla adonsela phansi ento ku-y-axis:

Iphuzu Q = iphuzu elimnyama elitholakala phansi kwesikhungo sento.
Impendulo efanele ingu-B.

2. Umbuzo Wokuhlolwa Kukazwelonke ka-2011/2012 A81 No.12

Indawo yesikhungo sokudonsa amandla esifanekiso sendiza njengoba kuboniswe esithombeni ohlangothini oluvela ku-x-axis...

A. 4,5 cm
B. 4 cm
C. 3,5 cm
D. 3 cm
E. 2 cm

Ingxoxo
Hlukanisa into ibe izingxenye ezimbili, ingxenye 1 = unxande, ingxenye 2 = unxantathu.
A₁ = (6-0)(3-0) = (6)(3) = 18
A₂ = ½ (6-3)(6-3) = ½ (3)(3) = 4,5
y₁ = ½ (3) = 1,5
y₂ = 1/3 (6-3) + 3 = 1/3 (3) + 3 = 1 + 3 = 4
Ama-coordinates enkabeni yamandla adonsela phansi ento ku-y-axis:

Impendulo efanele ngu-E.

3. Imibuzo Yokuhlolwa Kazwelonke Ka-2018

Naka izitatimende ezilandelayo:

(1) Phinda inqubo yokunquma umugqa osekhadibhodini kusuka ezindaweni ezahlukene zokulenga, bese uphawula indawo lapho imigqa emibili ihlangana khona njengesikhungo sokudonsa amandla sekhadibhodi.

(2) Bopha izinhlangothi zentambo enalitini bese ubeka isisindo bese unamathisela inaliti ekhadibhodini.

(3) Dweba umugqa eceleni kwamachashazi akukhadibhodi.

(4) Maka amaphuzu eceleni kwentambo ekhadibhodini.

(5) lengisa ikhadibhodi ngokubamba isisekelo senalithi

Ukuze kutholakale indawo ephakathi nendawo yamandla adonsela phansi kwekhadibhodi elingajwayelekile, ukulandelana kwezinyathelo okulungile...

Ingxoxo

Ukuhleleka okufanele kwezinyathelo kungu-2, 5, 4, 3, 1.