工程力学试题库填空题(国外英文资料).doc

工程力学试题库填空题(国外英文资料) Engineering mechanics test library Engineering mechanics test library The simplified result of the flat exchange force is ______. The equilibrium condition of the horizontal exchange force is ________. (one net force equals zero.) 2, the sufficient and necessary conditions of plane system of force balance is: ________________________________________________. (the algebraic sum of the projection on any axis of the force in the plane and the algebraic sum of the moments of the moment through the plane is zero.) When a rigid body is balanced by an unparallel but three forces, the action of these three forces must be ________. (exchange or exchange) As long as we keep the torque of the moment and the torque change, we can change... The size of the force of the force and the length of the arm. 5, space force system by equal to the size of the F1 = F2 = F3 = F of three force, role in graphic cubes three sides respectively on the diagonal, then the force system in the projection axis is equal to _____. 6, the force is the same as the reaction force, the opposite direction, and the effect is ______. (different objects) 7, sanli balance theorem is: ________________________________________________. (the rigid body is in equilibrium with three forces, and if two of them intersect one point, the third force will cross the point, and the third force copes.) The force and the force of the reaction are ____, and are in different objects. (equal, opposite) The two force equivalent conditions in the plane are...... (the two forces are the same, turning the same) The balance of the plane power couple is... The resultant moment is zero The plane parallel forces have ___ independent equilibrium equations. 2 The analytic condition of the balance of the balance of the plane is that... (,) The equivalent condition of the two forces on the rigid body is that... The main vector of the force system is the same as the main moment of the same point. The two forces acting on