Asha Purna Devi Tripadi श्रिपदी - Tvm Vishal Sahithya Sadan 1980 - P- 118 18 CM Subjects--Topical Terms: GeneralPARALLEL FORCES, FRICTION, GRAPHIC SOLUTIONS, CENTRE OF GRAVITY, STABLE AND UNSTABLE EQUILIBRIUM, FORCES IN THREE DIMENSIONS, MECHANICS, ATTRACTIONS AND POTENTIAL Dewey Class. No.: 891.433 / ASH-T