Njira ya lamulo losunga mphamvu zamakanika, mphamvu zomwe zingatheke za kasupe, makina osavuta

Zitsanzo za mafunso ndi njira za lamulo losunga mphamvu zamakanika, mphamvu zomwe zingatheke za kasupe, makina osavuta

Lamulo losunga mphamvu zamakanika

1. Chinthu chimakhala ndi mphamvu yosalekeza ya makina, kuwonjezera mphamvu ya kayendedwe ka zinthu, komanso kuchepetsa mphamvu yokoka. Chinthucho chili mu mkhalidwe wa….

1. diam
2. pita mmwamba
3. pita pansi
4. kukwera mmwamba mwachangu

Zokambirana
Mphamvu ya kinetic ikakula, liwiro la chinthucho limakula, ndipo mphamvu yokoka ikachepa, kutalika kwa chinthucho kumachepa pamwamba pa nthaka. Izi zimachitika pamene chinthucho chikuyenda kuchokera kutalika kwina kupita pansi.

Ubale pakati pa liwiro ndi mphamvu ya kinetic umawonetsedwa ndi fomula ya mphamvu ya kinetic:
EK = ½ mv²
Kufotokozera kwa fomula: EK = mphamvu ya kinetic, m = kulemera, v = liwiro

Ubale pakati pa kutalika ndi mphamvu yokoka umawonetsedwa ndi fomula ya mphamvu yokoka:
EP = mgh
Kufotokozera kwa fomula: EP = mphamvu yokoka, m = kulemera, g = kuthamanga kwa mphamvu yokoka, h = kutalika
Yankho lolondola ndi C.

Makina osavuta
2. Chiŵerengero cha kutalika kwa a ndi b mu chithunzi cha makina osavuta ndi a: b = 1: 2,2. Mtengo wocheperako wa mphamvu F yonyamulira katundu B wolemera 330 Newtons ndi…. Newton

1. 100
2. 150
3. 2200
4. 7260

Zokambirana
Amadziwika kuti:
Kutalika a = mkono wonyamula katundu (l)_B= = 1
Kutalika b = mkono wamphamvu (l)_F= = 2,2
Mphamvu yolemera (w) = 330 Newtons
Anafunsa kuti: Mphamvu yopezera mphamvu (F)
Yankho:
Njira yopezera ubwino wa makina osavuta ogwiritsira ntchito lever:
KM = w / F = l_F /l_B
Zambiri:
KM = ubwino wa makina, w = mphamvu yokoka, F = mphamvu yopezera mphamvu, l_F = mkono wokakamiza, l_B = mkono wonyamula katundu
 
w / F = l_F /l_B
330 / F = 2,2 / 1
330 / F = 2,2
330 / 2,2 = F
F = 150 Newton
Yankho lolondola ndi B.

3. Yang'anani chithunzi chomwe chili m'mbali. Wophunzira akusuntha chinthu kuchokera pa mfundo A kupita pa mfundo B ndi mphamvu F monga momwe zasonyezedwera pachithunzichi. Ngati kukangana pakati pa chinthucho ndi bolodi sikunanyalanyazidwe, ndiye kuti ubwino wa ntchitoyo ndi….

1. 4
2. 5/3
3. 5/4
4. 3/4

Zokambirana
Amadziwika kuti:
Kutalika kwa ndege yopendekeka (y) = mamita 4 - mita 1 = mamita 3
Kutalika kwa malo osalala (x) = mamita 4
Anafunsa kuti: Ubwino wa makina (MC) wa ndege yopendekeka
Yankho:
Werengerani kutalika kwa ndege yopendekeka pogwiritsa ntchito njira ya Pythagorean:
R = √3²+4² = √9+16 = √25 = mamita 5
Ubwino wa makina a ndege yopendekeka:
KM = R / y
KM = mamita 5 / mamita 3
KM = 5/3
Yankho lolondola ndi B.

Mphamvu Yotheka ya Masika

4. Bwalo losambira limagwiritsa ntchito maziko okhala ndi kasupe kuti lipereke mphamvu yokwera kuti wothamanga ayambe kulumpha. Wothamanga akalumpha pamwamba pake ndi mphamvu ya 500 N, kasupeyo amafupikitsidwa ndi masentimita 4. Kuchuluka kwa mphamvu zomwe kasupeyo amapereka kuti ayendetse wothamangayo ndi….

1. Ma joule awiri
2. Ma joule awiri
3. Ma joule awiri
4. Ma joule awiri

Zokambirana
Amadziwika kuti:
Mphamvu (F) = 500 N
Kusintha kwa kutalika kwa kasupe (Δx) = 4 cm = 0,04 m
Anafunsa kuti: Mphamvu yothekera ya masika
Yankho:
Choyamba, werengani kuchuluka kwa elastic constant ya kasupe pogwiritsa ntchito njira ya Hooke's law:
k = F / Δx = 500 N / 0,04 m = 12500 N/m
Mphamvu yotanuka ya masika ndi:
EP = ½ k Δx² = ½ (12500)(0,04)² = (6250)(0,0016)
EP = 10 Joule
Yankho lolondola ndi B.

Gwero la funso:

Mafunso a OSN a Sukulu ya Sekondale ya Fiziki ya Sukulu ya Sekondale