Statics (2) Basic equations In a plane ∑X=0 In space ∑X=0∑以x=0 ∑Y=0 ∑Y=0∑=0 ∑m4=0 ∑z=02=0 3. The steps, the skills and noticeable problems in solving questions (1)The steps of solution: (Select a body to be investigated 2Draw the force diagram( draw all the forces) sElect a coordinate system, write down the equations Solve the equations, determine the unknown quantities
11 (2) Basic equations in a plane in space X = 0 Y = 0 Z = 0 mX = 0 mY = 0 mZ = 0 X = 0 Y = 0 mA = 0 3. The steps, the skills and noticeable problems in solving questions (1) The steps of solution: ①Select a body to be investigated; ②Draw the force diagram (draw all the forces), ③Select a coordinate system, write down the equations; ④Solve the equations, determine the unknown quantities
学 (二)基本方程 平面2X=0空间(∑X=0∑=0 ∑Y=0 ∑Y=0∑=0 ∑m4=0 ∑z=02=0 三.解题步骤,解题技巧,解题注意问题 (一)解题步骤:①选研究对象 ②作受力图(有用,没有用的力均画上) ③选坐标列方程 ④解方程,求出未知数
12 (二) 基本方程 平面 空间 X = 0 Y = 0 Z = 0 mX = 0 mY = 0 mZ = 0 X = 0 Y = 0 mA = 0 三. 解题步骤，解题技巧，解题注意问题 (一)解题步骤：①选研究对象 ②作受力图（有用，没有用的力均画上） ③选坐标列方程 ④解方程，求出未知数