论文部分内容阅读
在初中物理中,主要的力学量有:长度、面积、体积、质量、密度、时间、速度、力、压强、机械功、机械功率、机械效率,共12个.近年来,在不少地区的物理中考中,对于一个给定的力学情景,问你能求出哪些力学量的开放题屡屡出现,现分类选析二例,供参考.一、研究对象单一例1(2004年宁波市)如图1所示,水平面上有一实心正方体,边长a为10cm,质量m为5kg.在大小为10N的水平拉力F的作用
In the junior high school physics, the main mechanical quantities are: length, area, volume, mass, density, time, speed, force, pressure, mechanical work, mechanical power, mechanical efficiency, a total of 12. In recent years, in many areas In the physics exam, for a given mechanical scenario, the open questions that ask you which mechanics quantity can be found frequently appear, and are now classified and analyzed in two cases for reference. A single case of research object 1 (Ningbo City in 2004) As shown in Fig. 1, there is a solid square on the horizontal plane, the side length a is 10cm, and the mass m is 5kg. The effect of the horizontal pull force F at a size of 10N