Zitsanzo zitatu za mafunso okhudza mphamvu yokoka
1. Chinthu chili ndi kulemera kwa 1 kg. Ngati kuthamanga chifukwa cha mphamvu yokoka = 10 m/s2, kodi chinthucho chimalemera zingati?
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chinthu (m) = 1 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Anafunsa Kulemera kwa chinthu (w)
Yankhani :
Fomula yokoka:
w = mg
Zambiri:
m = kulemera (chiwerengero cha mayiko onse ndi kilogalamu, chidule cha kg)
g = kuthamanga chifukwa cha mphamvu yokoka (mayunitsi apadziko lonse lapansi ndi mamita pa sekondi imodzi, mwachidule m/s2)
w = mphamvu yokoka (mayunitsi apadziko lonse ndi kg m/s2 (wotchedwanso Newton)
Kulemera kwa chinthucho ndi:
w = (1 kg)(10 m/s2) = 10 kg m/s2 = 10 Newton
2. Onani zithunzi (a) ndi (b) pansipa.
(a) Jambulani vekitala yokoka ya chinthucho, pachithunzi (a).
(b) Jambulani vekitala yokoka, gawo la vekitala yokoka lofanana ndi ndege yopendekeka ndi gawo la vekitala yokoka lolunjika ndi ndege yopendekeka, pachithunzi (b)!
Zokambirana
Njira yokoka (w) imalunjika pansi kapena pakati pa dziko lapansi.
wx = gawo lopingasa la mphamvu yokoka ndi wy = gawo loyima la mphamvu yokoka.
3. Ngati kulemera kwa chinthucho = 1 kg ndipo kuthamanga chifukwa cha mphamvu yokoka = 10 m/s 2 , dziwani (a) kukula kwa mphamvu yokoka (b) kukula kwa gawo la vekitala ya mphamvu yokoka yofanana ndi ndege yopendekeka ndi kukula kwa gawo la vekitala ya mphamvu yokoka yolunjika ku ndege yopendekeka.
Zokambirana
Kukula kwa mphamvu yokoka:
w = mg = (1 kg)(10 m/s2) = 10 kg m/s2 = 10 Newton
Kukula kwa gawo la mphamvu yokoka yofanana ndi ndege yopendekera:
wx = w sin 30o = (10 N)(0,5) = 5 Newton
Kukula kwa gawo la mphamvu yokoka yolunjika ku ndege yopendekera:
Wy = w cos 30o = (10 N)(0,5√3) = 5√3 Ma Newton
[Chingerezi: Kulemera ndi kulemera - mavuto ndi mayankho ]
