Simba rakajairika isimba rinobata zvinhu zviri kubata, uko divi resimba racho rakatarisa kune denderedzwa rekubatana. Chiratidzo charo ndiN uye system yepasi rose yemayuniti i kg m/s 2 kana Newton.
Simba N panzvimbo yakati sandara
N isimba rinoitwa pasi padanda, N' isimba rinoitwa nedanda riri pasi. w isimba rinokwevera pasi rinoshanda padanda kana huremu hwedanda. N naN' isimba rekuita-kuita, nepo N naw asiri masimba ekuita-kuita.
Kana bhokisi racho rakamira kana kuti risingafambi nenzira yakatwasuka, hukuru hwesimba reN hunogona kuverengerwa uchishandisa mutemo wekutanga waNewton.
ΣF y = 0
N – w = 0
N = w
Kana bhokisi rikasundirwa pasi nesimba F sezviri pamufananidzo uri padivi, saka hukuru hwesimba N ndehwekuti:
ΣF y = 0
N – w – F = 0
N = w + F
Simba rakajairika pane imwe ndege yakatsamira
N na N' ndiwo masimba ekuita-kuita. N isimba rakajairika rinoita basa pabhuroko uye N' isimba rakajairika rinoita basa padenderedzwa rakanamira. W inhengo yakatwasuka yesimba regiravhiti (w). Simba regiravhiti (w) rinoita basa pabhuroko. Hukuru hwesimba rakajairika ndi
ΣF y = 0
N – w y = 0
N = w y = w cos theta
