质量可以忽略不计的硬杆称为轻杆.轻杆可以是固定的,也可以是自由转动的,其对物体的作用力可以是拉力、压力或支持力,作用力的方向不一定沿着杆的方向,也可以产生侧向力.在力学中,杆对物体的作用是十分常见的物理现象,学生在处理这些问题时受到错误的生活经验的诱导和思维定势的影响,对现象 Hard rods with negligible masses are called light rods. The light rods can be fixed or free-wheeling. Their force on the object can be tension, pressure, or support. The direction of the force is not necessarily along the rod. The direction can also generate lateral forces. In mechanics, the effect of rods on objects is a very common physical phenomenon. When students deal with these problems, they are affected by the wrong experience of life and the influence of thinking and setting.