Zitsanzo ziwiri za kugwiritsa ntchito malamulo a Newton pa chingwe ndi makina onyamula katundu
1. Kulemera kwa chipika 1 ndi 2 kg, kulemera kwa chipika 2 ndi 3 kg, kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s2Dziwani (a) kukula ndi komwe dongosolo likufulumizitsa (b) kukula kwa mphamvu yogwira chingwe!
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chipika 1 (m1) = 2 kg
Kulemera kwa chipika 2 (m2) = 3 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Kulemera kwa chipika 1 (w)1) = m1 g = (2)(10) = 20 Newton
Kulemera kwa chipika 2 (w)2) = m2 g = (3)(10) = 30 Newton
Yankhani :
(a) kukula ndi njira yofulumizitsira dongosololi
w2 > w1 Chifukwa chake, chipika chachiwiri chimatsika, chipika chachiwiri chimakwera mmwamba. Choncho dongosolo limayenda mozungulira wotchi. Mphamvu yomwe ili mbali imodzi ndi kayendedwe ka dongosolo ndi w2 ndi T1, ndi yabwino. Mphamvu yomwe ili yotsutsana ndi kayendedwe ka dongosolo, yomwe ndi T2 ndi w1, yalembedwa kuti ndi yoipa.
Mphamvu ya kukakamira pa chingwe ndi yofanana mbali iliyonse ya chingwecho.
Kotero T1 = T2 = T
w2 – T + T – w1 = (m1 +m2) ndi
w2 - w1 = (m1 +m2) ndi
30 – 20 = (2 + 3) a
10 = 5 a
a = 10 / 5
a = 2 m/s2
Kukula kwa kuthamanga kwa dongosolo ndi 2 m/s2.
(b) kukula kwa mphamvu ya chingwe
Ndemanga 2.
Pali mphamvu ziwiri zomwe zikugwira ntchito pa block 2. Choyamba, kulemera kwa chipika 2 (w2) yomwe imatsogozedwa pansi, mbali yomweyo monga momwe mayendedwe a block 2 amayendera, kotero ili ndi chizindikiro chabwino. Chachiwiri, mphamvu ya kukanikiza chingwe pa chipika 2 (T2) yomwe imalunjika mmwamba, moyang'anizana ndi komwe chigawo chachiwiri chikuyenda, kotero ili ndi chizindikiro chotsutsa. Gwiritsani ntchito lamulo lachiwiri la Newton:
Ndemanga 1.
Pali mphamvu ziwiri zomwe zikugwira ntchito pa block 1. Choyamba, kulemera kwa chipika 1 (w1) yomwe imatsogozedwa pansi, moyang'anizana ndi komwe thunthu 1 limayendera, kotero ili ndi chizindikiro chotsutsa. Chachiwiri, mphamvu ya kukanikiza chingwe pa chipika 1 (T1) yomwe imatsogozedwa mmwamba, mbali yomweyo ya kayendedwe ka block 1, kotero ili ndi chizindikiro chabwino. Gwiritsani ntchito lamulo lachiwiri la Newton:
Kukula kwa mphamvu yogwira chingwe = T1 = T2 = T = 24 Newton
2. Block 1 ili pamalo osalala komanso osalala. Kulemera kwa block 1 ndi 2 kg, kulemera kwa block 2 ndi 4 kg, ndipo kuthamanga kwa mphamvu yokoka ndi 10 m/s.2, coefficient ya static ndi kinetic friction ndi 0,4 ndi 0,3. Kodi dongosololi lili pamalo opumulira kapena likuyenda? Ngati dongosololi likuyenda, dziwani kukula ndi komwe dongosololi likuthamangira!
Zokambirana
Mphamvu yokakamiza (T) ya chingwe siinawonetsedwe chifukwa, monga momwe zinalili kale, mphamvu yokakamiza ya chingwe imachotsedwa mu equation. Ngati yafunsidwa mu funso, mphamvu yokakamiza ya chingwe iyenera kusonyezedwa, koma ngati siinafunsidwe mu funso, ingoinyalanyaza.
Ndizodziwika kuti :
Anafunsa Kodi dongosololi silikuyenda kapena likuyenda? Ngati likuyenda, dziwani kukula ndi komwe likuthamangira dongosololi!
Yankhani :
Chifukwa w2 > fs (40 Newton > 8 Newton) kenako dongosolo limasuntha, pomwe chipika chachiwiri chimasunthira molunjika pansi ndipo chipika choyamba chimasuntha molunjika kumanja. Pamene dongosolo likuyenda, mphamvu yokangana yomwe ikugwira ntchito pa chipika choyamba ndi mphamvu yokangana ya kinetic (f).kGwiritsani ntchito lamulo lachiwiri la Newton:
Kukula kwa kuthamanga kwa dongosolo ndi 5,7 m/s2
[Chingerezi: Matupi olumikizidwa ndi chingwe ndi pulley - kugwiritsa ntchito lamulo la Newton la kuyenda ]
