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在传送带问题中,传送带上的物体既相对于地面运动,又相对于传送带运动.研究物体在皮带上留下多长的痕迹,必须分析痕迹是如何产生的.这可以借助生活中的经验:在纸上画线,若笔动纸不动,可以画出痕迹;若纸动笔不动,也可以画出痕迹;若笔不动,纸也不动,不能画出痕迹;若笔动,纸也动,有可能画出痕迹,也有可能画不出.总结规律,只有当纸与笔有相对运动时,笔才能在纸上留下痕迹.同理,为了求出皮带上痕迹的长度,应分别求出在物体运动时传送带传送的位移和物体相对地运动的位移,两位移的差值即为痕迹的长度.
In the problem of conveyor belts, objects on the conveyor belt move relative to the ground and move relative to the conveyor belt. Investigating how long the objects leave on the belt, it is necessary to analyze how the marks are generated. This can be done with the help of life experience: Lines on paper can be traced if they are not moving; if traces of paper do not move, traces can also be drawn; if the pen does not move, the paper does not move and traces cannot be drawn; if the stroke moves, the paper is also Moving, it is possible to draw a trace, or it may not be possible to draw. To summarize the law, the pen can only leave traces on the paper when the paper and pen have relative motion. Similarly, in order to find the length of the trace on the belt, they should be separately Find the displacement of the conveyor belt and the relative movement of the object when the object moves. The difference between the two displacements is the length of the trace.