"H sxetikh kinhsh dio swmatidiwn pou ypokeintai mono sthn amoivaia allilepidrash tous, einai isodynamh me thn kinhsh se sxesh me enan adraneiako parathrhth enos swmatos mazas ishs me thn anigmeni maza kai panw sto opoio dra dynamh ish me thn allhlepidrash tous."
Px mporeis na anageis thn kinhsh ths selhnhs se sxesh me th gh apo provlima 2 swmatwn se provlima enos swmatos, xrisimopoiwntas thn anigmeni maza tou sistimatos ghs-selinis kai dinamh pou einai ish me thn elksh ths ghs panw sth selhnh.
