Okusinziira ku kigereeso ky’empalirizo ezisikira empuyibbiri (the theory of opposing forces) , ekibala nga ekyagwira kakensa Isaac Newton mu mutwe bwe kigwa , byombi ekibala n’ensi kwe kigwa biba bisikang’ana(are pulling each other) naye kino tekyeyoreka butereevu gy’oli kubanga empalirizo esikira mu kibala ntoni nnyo ekiyitiridde ng’ogigerageranyizza n’essikirizo eddene erisikira mu Nsi erina enzitoya(mass) esukkulumye ku y’ekibala mu bungi.