1. Ukusebenzisa izinto ezintsha - le mveliso ikhethwa ngokucokisekileyo ngezinto ezintsha, iyala ukusebenzisa izinto zesibini, kwaye iqinisekisiwe ngakumbi ukuyisebenzisa.
2 Udonga lwangaphakathi oluthambileyo - i-coefficient ephantsi ye-friction, i-friction encinci kunemibhobho yensimbi
3 Umbhobho oqinisiweyo - inkqubo yokuvelisa ejiyileyo, ubomi obude benkonzo kunye nomgangatho othembekileyo