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解答力学作图题要注意四点:①力的作用点要画在受力物体上,画多个力时不要漏掉力;②作力的图示要严格表示力的三要素.并附上标度,线段的长度表示力的大小要与标度成整数倍;③根据力学原理分析力的大小;④作最小的力,先连接支点和力的作用点,作最小力的力臂,然后画力的方向,要与力臂垂直;⑤对于滑轮组的绕绳方法,要求最省力时,绕绳的
There are four points to pay attention to the mechanics: 1. The force’s point of action should be painted on the stressed object, and do not miss the force when drawing multiple forces; 2 The figure of force must strictly express the three elements of force. Scale, the length of the line represents the size of the force to be an integral multiple of the scale; 3 according to the principle of force analysis of the force; 4 for the minimum force, first connect the fulcrum and the point of force, for the minimum force of the arm, and then The direction of the drawing force should be perpendicular to the arm; 5 For the roping method of the pulley, when the most effort is required, the rope is wound.