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一、力学作图考情解读:力学作图种类:一是力的示意图;二是杠杆力臂的作图;三是滑轮组的组装.作图时应注意以下几点:(1)在力的示意图中,线段的长度不能准确地表示力的大小,但在同一个图中,力越大,线段应该越长;(2)力的作用点要画在受力物体上,重力的作用点要画在物体的重心上;(3)力臂是支点到力的作用线的距离,一定不要把力臂理解成从支点到力的作用点的距离.解题技巧:1.作力的示意图时,力的作用点要画在受力物体
First, the mechanical drawing Interpretation of the test conditions: the type of mechanical drawing: First, the schematic diagram of the force; Second, the lever arm of the drawing; Third, the pulley assembly. Drawings should note the following points: (1) In the sketch map, the length of the line segment can not accurately represent the size of the force, but in the same figure, the larger the force, the longer the line segment should be. (2) The point of force should be drawn on the stressed object, the point of gravity Draw on the center of gravity of the object; (3) the arm is the distance between the fulcrum and the line of action of the force, and must not be understood as the distance between the fulcrum and the point of force action. , The role of force point to be drawn on the force object